1365 lines
44 KiB
C#
1365 lines
44 KiB
C#
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/*
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* System.TimeZoneInfo
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*
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* Author(s)
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* Stephane Delcroix <stephane@delcroix.org>
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*
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* Copyright 2011 Xamarin Inc.
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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using System;
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using System.Runtime.CompilerServices;
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using System.Threading;
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using System.Collections.Generic;
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using System.Collections.ObjectModel;
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using System.Runtime.Serialization;
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using System.Text;
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using System.Globalization;
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#if LIBC || MONODROID
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using System.IO;
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using Mono;
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#endif
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using Microsoft.Win32;
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namespace System
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{
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#if MOBILE
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[TypeForwardedFrom (Consts.AssemblySystem_Core)]
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#else
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[TypeForwardedFrom (Consts.AssemblySystemCore_3_5)]
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#endif
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[SerializableAttribute]
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public
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sealed partial class TimeZoneInfo : IEquatable<TimeZoneInfo>, ISerializable, IDeserializationCallback
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{
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TimeSpan baseUtcOffset;
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public TimeSpan BaseUtcOffset {
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get { return baseUtcOffset; }
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}
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string daylightDisplayName;
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public string DaylightName {
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get {
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return supportsDaylightSavingTime
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? daylightDisplayName
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: string.Empty;
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}
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}
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string displayName;
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public string DisplayName {
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get { return displayName; }
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}
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string id;
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public string Id {
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get { return id; }
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}
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static TimeZoneInfo local;
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public static TimeZoneInfo Local {
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get {
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var l = local;
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if (l == null) {
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l = CreateLocal ();
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if (l == null)
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throw new TimeZoneNotFoundException ();
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if (Interlocked.CompareExchange (ref local, l, null) != null)
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l = local;
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}
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return l;
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}
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}
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/*
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TimeZone transitions are stored when there is a change on the base offset.
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*/
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private List<KeyValuePair<DateTime, TimeType>> transitions;
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static TimeZoneInfo CreateLocal ()
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{
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#if MONODROID
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return AndroidTimeZones.Local;
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#elif MONOTOUCH
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using (Stream stream = GetMonoTouchData (null)) {
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return BuildFromStream ("Local", stream);
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}
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#else
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#if !NET_2_1
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if (IsWindows && LocalZoneKey != null) {
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string name = (string)LocalZoneKey.GetValue ("TimeZoneKeyName");
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name = TrimSpecial (name);
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if (name != null)
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return TimeZoneInfo.FindSystemTimeZoneById (name);
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}
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#endif
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var tz = Environment.GetEnvironmentVariable ("TZ");
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if (tz != null) {
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if (tz == String.Empty)
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return Utc;
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try {
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return FindSystemTimeZoneByFileName (tz, Path.Combine (TimeZoneDirectory, tz));
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} catch {
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return Utc;
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}
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}
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try {
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return FindSystemTimeZoneByFileName ("Local", "/etc/localtime");
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} catch {
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try {
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return FindSystemTimeZoneByFileName ("Local", Path.Combine (TimeZoneDirectory, "localtime"));
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} catch {
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return null;
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}
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}
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#endif
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}
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string standardDisplayName;
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public string StandardName {
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get { return standardDisplayName; }
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}
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bool supportsDaylightSavingTime;
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public bool SupportsDaylightSavingTime {
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get { return supportsDaylightSavingTime; }
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}
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static TimeZoneInfo utc;
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public static TimeZoneInfo Utc {
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get {
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if (utc == null)
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utc = CreateCustomTimeZone ("UTC", new TimeSpan (0), "UTC", "UTC");
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return utc;
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}
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}
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#if LIBC
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static string timeZoneDirectory;
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static string TimeZoneDirectory {
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get {
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if (timeZoneDirectory == null)
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timeZoneDirectory = "/usr/share/zoneinfo";
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return timeZoneDirectory;
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}
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set {
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ClearCachedData ();
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timeZoneDirectory = value;
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}
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}
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#endif
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private AdjustmentRule [] adjustmentRules;
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#if !NET_2_1
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/// <summary>
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/// Determine whether windows of not (taken Stephane Delcroix's code)
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/// </summary>
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private static bool IsWindows
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{
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get {
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int platform = (int) Environment.OSVersion.Platform;
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return ((platform != 4) && (platform != 6) && (platform != 128));
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}
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}
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/// <summary>
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/// Needed to trim misc garbage in MS registry keys
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/// </summary>
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private static string TrimSpecial (string str)
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{
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var Istart = 0;
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while (Istart < str.Length && !char.IsLetterOrDigit(str[Istart])) Istart++;
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var Iend = str.Length - 1;
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while (Iend > Istart && !char.IsLetterOrDigit(str[Iend])) Iend--;
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return str.Substring (Istart, Iend-Istart+1);
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}
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static RegistryKey timeZoneKey;
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static RegistryKey TimeZoneKey {
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get {
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if (timeZoneKey != null)
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return timeZoneKey;
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if (!IsWindows)
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return null;
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return timeZoneKey = Registry.LocalMachine.OpenSubKey (
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"SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\Time Zones",
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false);
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}
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}
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static RegistryKey localZoneKey;
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static RegistryKey LocalZoneKey {
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get {
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if (localZoneKey != null)
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return localZoneKey;
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if (!IsWindows)
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return null;
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return localZoneKey = Registry.LocalMachine.OpenSubKey (
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"SYSTEM\\CurrentControlSet\\Control\\TimeZoneInformation", false);
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}
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}
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#endif
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private static bool TryAddTicks (DateTime date, long ticks, out DateTime result, DateTimeKind kind = DateTimeKind.Unspecified)
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{
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var resultTicks = date.Ticks + ticks;
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if (resultTicks < DateTime.MinValue.Ticks || resultTicks > DateTime.MaxValue.Ticks) {
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result = default (DateTime);
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return false;
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}
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result = new DateTime (resultTicks, kind);
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return true;
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}
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public static void ClearCachedData ()
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{
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local = null;
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utc = null;
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systemTimeZones = null;
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}
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public static DateTime ConvertTime (DateTime dateTime, TimeZoneInfo destinationTimeZone)
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{
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return ConvertTime (dateTime, dateTime.Kind == DateTimeKind.Utc ? TimeZoneInfo.Utc : TimeZoneInfo.Local, destinationTimeZone);
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}
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public static DateTime ConvertTime (DateTime dateTime, TimeZoneInfo sourceTimeZone, TimeZoneInfo destinationTimeZone)
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{
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if (sourceTimeZone == null)
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throw new ArgumentNullException ("sourceTimeZone");
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if (destinationTimeZone == null)
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throw new ArgumentNullException ("destinationTimeZone");
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if (dateTime.Kind == DateTimeKind.Local && sourceTimeZone != TimeZoneInfo.Local)
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throw new ArgumentException ("Kind property of dateTime is Local but the sourceTimeZone does not equal TimeZoneInfo.Local");
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if (dateTime.Kind == DateTimeKind.Utc && sourceTimeZone != TimeZoneInfo.Utc)
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throw new ArgumentException ("Kind property of dateTime is Utc but the sourceTimeZone does not equal TimeZoneInfo.Utc");
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if (sourceTimeZone.IsInvalidTime (dateTime))
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throw new ArgumentException ("dateTime parameter is an invalid time");
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if (dateTime.Kind == DateTimeKind.Local && sourceTimeZone == TimeZoneInfo.Local && destinationTimeZone == TimeZoneInfo.Local)
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return dateTime;
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DateTime utc = ConvertTimeToUtc (dateTime, sourceTimeZone);
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if (destinationTimeZone != TimeZoneInfo.Utc) {
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utc = ConvertTimeFromUtc (utc, destinationTimeZone);
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if (dateTime.Kind == DateTimeKind.Unspecified)
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return DateTime.SpecifyKind (utc, DateTimeKind.Unspecified);
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}
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return utc;
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}
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public static DateTimeOffset ConvertTime(DateTimeOffset dateTimeOffset, TimeZoneInfo destinationTimeZone)
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{
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if (destinationTimeZone == null)
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throw new ArgumentNullException("destinationTimeZone");
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var utcDateTime = dateTimeOffset.UtcDateTime;
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bool isDst;
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var utcOffset = destinationTimeZone.GetUtcOffset(utcDateTime, out isDst);
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return new DateTimeOffset(DateTime.SpecifyKind(utcDateTime, DateTimeKind.Unspecified) + utcOffset, utcOffset);
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}
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public static DateTime ConvertTimeBySystemTimeZoneId (DateTime dateTime, string destinationTimeZoneId)
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{
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return ConvertTime (dateTime, FindSystemTimeZoneById (destinationTimeZoneId));
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}
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public static DateTime ConvertTimeBySystemTimeZoneId (DateTime dateTime, string sourceTimeZoneId, string destinationTimeZoneId)
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{
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return ConvertTime (dateTime, FindSystemTimeZoneById (sourceTimeZoneId), FindSystemTimeZoneById (destinationTimeZoneId));
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}
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public static DateTimeOffset ConvertTimeBySystemTimeZoneId (DateTimeOffset dateTimeOffset, string destinationTimeZoneId)
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{
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return ConvertTime (dateTimeOffset, FindSystemTimeZoneById (destinationTimeZoneId));
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}
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private DateTime ConvertTimeFromUtc (DateTime dateTime)
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{
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if (dateTime.Kind == DateTimeKind.Local)
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throw new ArgumentException ("Kind property of dateTime is Local");
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if (this == TimeZoneInfo.Utc)
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return DateTime.SpecifyKind (dateTime, DateTimeKind.Utc);
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var utcOffset = GetUtcOffset (dateTime);
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var kind = (this == TimeZoneInfo.Local)? DateTimeKind.Local : DateTimeKind.Unspecified;
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DateTime result;
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if (!TryAddTicks (dateTime, utcOffset.Ticks, out result, kind))
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return DateTime.SpecifyKind (DateTime.MaxValue, kind);
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return result;
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}
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public static DateTime ConvertTimeFromUtc (DateTime dateTime, TimeZoneInfo destinationTimeZone)
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{
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if (destinationTimeZone == null)
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throw new ArgumentNullException ("destinationTimeZone");
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return destinationTimeZone.ConvertTimeFromUtc (dateTime);
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}
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public static DateTime ConvertTimeToUtc (DateTime dateTime)
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{
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if (dateTime.Kind == DateTimeKind.Utc)
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return dateTime;
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return ConvertTimeToUtc (dateTime, TimeZoneInfo.Local);
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}
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static internal DateTime ConvertTimeToUtc(DateTime dateTime, TimeZoneInfoOptions flags)
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{
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return ConvertTimeToUtc (dateTime, TimeZoneInfo.Local, flags);
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}
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public static DateTime ConvertTimeToUtc (DateTime dateTime, TimeZoneInfo sourceTimeZone)
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{
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return ConvertTimeToUtc (dateTime, sourceTimeZone, TimeZoneInfoOptions.None);
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}
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static DateTime ConvertTimeToUtc (DateTime dateTime, TimeZoneInfo sourceTimeZone, TimeZoneInfoOptions flags)
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{
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if ((flags & TimeZoneInfoOptions.NoThrowOnInvalidTime) == 0) {
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if (sourceTimeZone == null)
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throw new ArgumentNullException ("sourceTimeZone");
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if (dateTime.Kind == DateTimeKind.Utc && sourceTimeZone != TimeZoneInfo.Utc)
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throw new ArgumentException ("Kind property of dateTime is Utc but the sourceTimeZone does not equal TimeZoneInfo.Utc");
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if (dateTime.Kind == DateTimeKind.Local && sourceTimeZone != TimeZoneInfo.Local)
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throw new ArgumentException ("Kind property of dateTime is Local but the sourceTimeZone does not equal TimeZoneInfo.Local");
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if (sourceTimeZone.IsInvalidTime (dateTime))
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throw new ArgumentException ("dateTime parameter is an invalid time");
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}
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if (dateTime.Kind == DateTimeKind.Utc)
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return dateTime;
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bool isDst;
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var utcOffset = sourceTimeZone.GetUtcOffset (dateTime, out isDst);
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DateTime utcDateTime;
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if (!TryAddTicks (dateTime, -utcOffset.Ticks, out utcDateTime, DateTimeKind.Utc))
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return DateTime.SpecifyKind (DateTime.MinValue, DateTimeKind.Utc);
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return utcDateTime;
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}
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static internal TimeSpan GetDateTimeNowUtcOffsetFromUtc(DateTime time, out Boolean isAmbiguousLocalDst)
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{
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bool isDaylightSavings;
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return GetUtcOffsetFromUtc(time, TimeZoneInfo.Local, out isDaylightSavings, out isAmbiguousLocalDst);
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}
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public static TimeZoneInfo CreateCustomTimeZone (string id, TimeSpan baseUtcOffset, string displayName, string standardDisplayName)
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{
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return CreateCustomTimeZone (id, baseUtcOffset, displayName, standardDisplayName, null, null, true);
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}
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public static TimeZoneInfo CreateCustomTimeZone (string id, TimeSpan baseUtcOffset, string displayName, string standardDisplayName, string daylightDisplayName, TimeZoneInfo.AdjustmentRule [] adjustmentRules)
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{
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return CreateCustomTimeZone (id, baseUtcOffset, displayName, standardDisplayName, daylightDisplayName, adjustmentRules, false);
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}
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public static TimeZoneInfo CreateCustomTimeZone ( string id, TimeSpan baseUtcOffset, string displayName, string standardDisplayName, string daylightDisplayName, TimeZoneInfo.AdjustmentRule [] adjustmentRules, bool disableDaylightSavingTime)
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{
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return new TimeZoneInfo (id, baseUtcOffset, displayName, standardDisplayName, daylightDisplayName, adjustmentRules, disableDaylightSavingTime);
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}
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public override bool Equals (object obj)
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{
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return Equals (obj as TimeZoneInfo);
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}
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public bool Equals (TimeZoneInfo other)
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{
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if (other == null)
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return false;
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return other.Id == this.Id && HasSameRules (other);
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}
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public static TimeZoneInfo FindSystemTimeZoneById (string id)
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{
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//FIXME: this method should check for cached values in systemTimeZones
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if (id == null)
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throw new ArgumentNullException ("id");
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#if !NET_2_1
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if (TimeZoneKey != null)
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{
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RegistryKey key = TimeZoneKey.OpenSubKey (id, false);
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if (key == null)
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throw new TimeZoneNotFoundException ();
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return FromRegistryKey(id, key);
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}
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#endif
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// Local requires special logic that already exists in the Local property (bug #326)
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if (id == "Local")
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return Local;
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#if MONOTOUCH
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using (Stream stream = GetMonoTouchData (id)) {
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return BuildFromStream (id, stream);
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}
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#elif MONODROID
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var timeZoneInfo = AndroidTimeZones.GetTimeZone (id, id);
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if (timeZoneInfo == null)
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throw new TimeZoneNotFoundException ();
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return timeZoneInfo;
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#elif LIBC
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string filepath = Path.Combine (TimeZoneDirectory, id);
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return FindSystemTimeZoneByFileName (id, filepath);
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#else
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throw new NotImplementedException ();
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#endif
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}
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#if LIBC
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private static TimeZoneInfo FindSystemTimeZoneByFileName (string id, string filepath)
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{
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if (!File.Exists (filepath))
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throw new TimeZoneNotFoundException ();
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using (FileStream stream = File.OpenRead (filepath)) {
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return BuildFromStream (id, stream);
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}
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}
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#endif
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#if LIBC || MONOTOUCH
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const int BUFFER_SIZE = 16384; //Big enough for any tz file (on Oct 2008, all tz files are under 10k)
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private static TimeZoneInfo BuildFromStream (string id, Stream stream)
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{
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byte [] buffer = new byte [BUFFER_SIZE];
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int length = stream.Read (buffer, 0, BUFFER_SIZE);
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if (!ValidTZFile (buffer, length))
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throw new InvalidTimeZoneException ("TZ file too big for the buffer");
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try {
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return ParseTZBuffer (id, buffer, length);
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} catch (Exception e) {
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throw new InvalidTimeZoneException (e.Message);
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}
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}
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#endif
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#if !NET_2_1
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private static TimeZoneInfo FromRegistryKey (string id, RegistryKey key)
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{
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byte [] reg_tzi = (byte []) key.GetValue ("TZI");
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if (reg_tzi == null)
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throw new InvalidTimeZoneException ();
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int bias = BitConverter.ToInt32 (reg_tzi, 0);
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TimeSpan baseUtcOffset = new TimeSpan (0, -bias, 0);
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string display_name = (string) key.GetValue ("Display");
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string standard_name = (string) key.GetValue ("Std");
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string daylight_name = (string) key.GetValue ("Dlt");
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List<AdjustmentRule> adjustmentRules = new List<AdjustmentRule> ();
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RegistryKey dst_key = key.OpenSubKey ("Dynamic DST", false);
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if (dst_key != null) {
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int first_year = (int) dst_key.GetValue ("FirstEntry");
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int last_year = (int) dst_key.GetValue ("LastEntry");
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int year;
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for (year=first_year; year<=last_year; year++) {
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byte [] dst_tzi = (byte []) dst_key.GetValue (year.ToString ());
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if (dst_tzi != null) {
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int start_year = year == first_year ? 1 : year;
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int end_year = year == last_year ? 9999 : year;
|
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ParseRegTzi(adjustmentRules, start_year, end_year, dst_tzi);
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}
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}
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}
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else
|
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ParseRegTzi(adjustmentRules, 1, 9999, reg_tzi);
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|
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return CreateCustomTimeZone (id, baseUtcOffset, display_name, standard_name, daylight_name, ValidateRules (adjustmentRules).ToArray ());
|
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}
|
|
|
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private static void ParseRegTzi (List<AdjustmentRule> adjustmentRules, int start_year, int end_year, byte [] buffer)
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{
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//int standard_bias = BitConverter.ToInt32 (buffer, 4); /* not sure how to handle this */
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int daylight_bias = BitConverter.ToInt32 (buffer, 8);
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|
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int standard_year = BitConverter.ToInt16 (buffer, 12);
|
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int standard_month = BitConverter.ToInt16 (buffer, 14);
|
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int standard_dayofweek = BitConverter.ToInt16 (buffer, 16);
|
|
int standard_day = BitConverter.ToInt16 (buffer, 18);
|
|
int standard_hour = BitConverter.ToInt16 (buffer, 20);
|
|
int standard_minute = BitConverter.ToInt16 (buffer, 22);
|
|
int standard_second = BitConverter.ToInt16 (buffer, 24);
|
|
int standard_millisecond = BitConverter.ToInt16 (buffer, 26);
|
|
|
|
int daylight_year = BitConverter.ToInt16 (buffer, 28);
|
|
int daylight_month = BitConverter.ToInt16 (buffer, 30);
|
|
int daylight_dayofweek = BitConverter.ToInt16 (buffer, 32);
|
|
int daylight_day = BitConverter.ToInt16 (buffer, 34);
|
|
int daylight_hour = BitConverter.ToInt16 (buffer, 36);
|
|
int daylight_minute = BitConverter.ToInt16 (buffer, 38);
|
|
int daylight_second = BitConverter.ToInt16 (buffer, 40);
|
|
int daylight_millisecond = BitConverter.ToInt16 (buffer, 42);
|
|
|
|
if (standard_month == 0 || daylight_month == 0)
|
|
return;
|
|
|
|
DateTime start_date;
|
|
DateTime start_timeofday = new DateTime (1, 1, 1, daylight_hour, daylight_minute, daylight_second, daylight_millisecond);
|
|
TransitionTime start_transition_time;
|
|
|
|
if (daylight_year == 0) {
|
|
start_date = new DateTime (start_year, 1, 1);
|
|
start_transition_time = TransitionTime.CreateFloatingDateRule (
|
|
start_timeofday, daylight_month, daylight_day,
|
|
(DayOfWeek) daylight_dayofweek);
|
|
}
|
|
else {
|
|
start_date = new DateTime (daylight_year, daylight_month, daylight_day,
|
|
daylight_hour, daylight_minute, daylight_second, daylight_millisecond);
|
|
start_transition_time = TransitionTime.CreateFixedDateRule (
|
|
start_timeofday, daylight_month, daylight_day);
|
|
}
|
|
|
|
DateTime end_date;
|
|
DateTime end_timeofday = new DateTime (1, 1, 1, standard_hour, standard_minute, standard_second, standard_millisecond);
|
|
TransitionTime end_transition_time;
|
|
|
|
if (standard_year == 0) {
|
|
end_date = new DateTime (end_year, 12, 31);
|
|
end_transition_time = TransitionTime.CreateFloatingDateRule (
|
|
end_timeofday, standard_month, standard_day,
|
|
(DayOfWeek) standard_dayofweek);
|
|
}
|
|
else {
|
|
end_date = new DateTime (standard_year, standard_month, standard_day,
|
|
standard_hour, standard_minute, standard_second, standard_millisecond);
|
|
end_transition_time = TransitionTime.CreateFixedDateRule (
|
|
end_timeofday, standard_month, standard_day);
|
|
}
|
|
|
|
TimeSpan daylight_delta = new TimeSpan(0, -daylight_bias, 0);
|
|
|
|
adjustmentRules.Add (AdjustmentRule.CreateAdjustmentRule (
|
|
start_date, end_date, daylight_delta,
|
|
start_transition_time, end_transition_time));
|
|
}
|
|
#endif
|
|
|
|
public AdjustmentRule [] GetAdjustmentRules ()
|
|
{
|
|
if (!supportsDaylightSavingTime)
|
|
return new AdjustmentRule [0];
|
|
else
|
|
return (AdjustmentRule []) adjustmentRules.Clone ();
|
|
}
|
|
|
|
public TimeSpan [] GetAmbiguousTimeOffsets (DateTime dateTime)
|
|
{
|
|
if (!IsAmbiguousTime (dateTime))
|
|
throw new ArgumentException ("dateTime is not an ambiguous time");
|
|
|
|
AdjustmentRule rule = GetApplicableRule (dateTime);
|
|
if (rule != null)
|
|
return new TimeSpan[] {baseUtcOffset, baseUtcOffset + rule.DaylightDelta};
|
|
else
|
|
return new TimeSpan[] {baseUtcOffset, baseUtcOffset};
|
|
}
|
|
|
|
public TimeSpan [] GetAmbiguousTimeOffsets (DateTimeOffset dateTimeOffset)
|
|
{
|
|
if (!IsAmbiguousTime (dateTimeOffset))
|
|
throw new ArgumentException ("dateTimeOffset is not an ambiguous time");
|
|
|
|
throw new NotImplementedException ();
|
|
}
|
|
|
|
public override int GetHashCode ()
|
|
{
|
|
int hash_code = Id.GetHashCode ();
|
|
foreach (AdjustmentRule rule in GetAdjustmentRules ())
|
|
hash_code ^= rule.GetHashCode ();
|
|
return hash_code;
|
|
}
|
|
|
|
void ISerializable.GetObjectData (SerializationInfo info, StreamingContext context)
|
|
{
|
|
if (info == null)
|
|
throw new ArgumentNullException ("info");
|
|
info.AddValue ("Id", id);
|
|
info.AddValue ("DisplayName", displayName);
|
|
info.AddValue ("StandardName", standardDisplayName);
|
|
info.AddValue ("DaylightName", daylightDisplayName);
|
|
info.AddValue ("BaseUtcOffset", baseUtcOffset);
|
|
info.AddValue ("AdjustmentRules", adjustmentRules);
|
|
info.AddValue ("SupportsDaylightSavingTime", SupportsDaylightSavingTime);
|
|
}
|
|
|
|
//FIXME: change this to a generic Dictionary and allow caching for FindSystemTimeZoneById
|
|
private static List<TimeZoneInfo> systemTimeZones;
|
|
public static ReadOnlyCollection<TimeZoneInfo> GetSystemTimeZones ()
|
|
{
|
|
if (systemTimeZones == null) {
|
|
systemTimeZones = new List<TimeZoneInfo> ();
|
|
#if !NET_2_1
|
|
if (TimeZoneKey != null) {
|
|
foreach (string id in TimeZoneKey.GetSubKeyNames ()) {
|
|
try {
|
|
systemTimeZones.Add (FindSystemTimeZoneById (id));
|
|
} catch {}
|
|
}
|
|
|
|
return new ReadOnlyCollection<TimeZoneInfo> (systemTimeZones);
|
|
}
|
|
#endif
|
|
#if MONODROID
|
|
foreach (string id in AndroidTimeZones.GetAvailableIds ()) {
|
|
var tz = AndroidTimeZones.GetTimeZone (id, id);
|
|
if (tz != null)
|
|
systemTimeZones.Add (tz);
|
|
}
|
|
#elif MONOTOUCH
|
|
if (systemTimeZones.Count == 0) {
|
|
foreach (string name in GetMonoTouchNames ()) {
|
|
using (Stream stream = GetMonoTouchData (name, false)) {
|
|
if (stream == null)
|
|
continue;
|
|
systemTimeZones.Add (BuildFromStream (name, stream));
|
|
}
|
|
}
|
|
}
|
|
#elif LIBC
|
|
string[] continents = new string [] {"Africa", "America", "Antarctica", "Arctic", "Asia", "Atlantic", "Brazil", "Canada", "Chile", "Europe", "Indian", "Mexico", "Mideast", "Pacific", "US"};
|
|
foreach (string continent in continents) {
|
|
try {
|
|
foreach (string zonepath in Directory.GetFiles (Path.Combine (TimeZoneDirectory, continent))) {
|
|
try {
|
|
string id = String.Format ("{0}/{1}", continent, Path.GetFileName (zonepath));
|
|
systemTimeZones.Add (FindSystemTimeZoneById (id));
|
|
} catch (ArgumentNullException) {
|
|
} catch (TimeZoneNotFoundException) {
|
|
} catch (InvalidTimeZoneException) {
|
|
} catch (Exception) {
|
|
throw;
|
|
}
|
|
}
|
|
} catch {}
|
|
}
|
|
#else
|
|
throw new NotImplementedException ("This method is not implemented for this platform");
|
|
#endif
|
|
}
|
|
return new ReadOnlyCollection<TimeZoneInfo> (systemTimeZones);
|
|
}
|
|
|
|
public TimeSpan GetUtcOffset (DateTime dateTime)
|
|
{
|
|
bool isDST;
|
|
return GetUtcOffset (dateTime, out isDST);
|
|
}
|
|
|
|
public TimeSpan GetUtcOffset (DateTimeOffset dateTimeOffset)
|
|
{
|
|
throw new NotImplementedException ();
|
|
}
|
|
|
|
private TimeSpan GetUtcOffset (DateTime dateTime, out bool isDST)
|
|
{
|
|
isDST = false;
|
|
|
|
TimeZoneInfo tz = this;
|
|
if (dateTime.Kind == DateTimeKind.Utc)
|
|
tz = TimeZoneInfo.Utc;
|
|
|
|
if (dateTime.Kind == DateTimeKind.Local)
|
|
tz = TimeZoneInfo.Local;
|
|
|
|
bool isTzDst;
|
|
var tzOffset = GetUtcOffsetHelper (dateTime, tz, out isTzDst);
|
|
|
|
if (tz == this) {
|
|
isDST = isTzDst;
|
|
return tzOffset;
|
|
}
|
|
|
|
DateTime utcDateTime;
|
|
if (!TryAddTicks (dateTime, -tzOffset.Ticks, out utcDateTime, DateTimeKind.Utc))
|
|
return BaseUtcOffset;
|
|
|
|
return GetUtcOffsetHelper (utcDateTime, this, out isDST);
|
|
}
|
|
|
|
// This is an helper method used by the method above, do not use this on its own.
|
|
private static TimeSpan GetUtcOffsetHelper (DateTime dateTime, TimeZoneInfo tz, out bool isDST)
|
|
{
|
|
if (dateTime.Kind == DateTimeKind.Local && tz != TimeZoneInfo.Local)
|
|
throw new Exception ();
|
|
|
|
isDST = false;
|
|
|
|
if (tz == TimeZoneInfo.Utc)
|
|
return TimeSpan.Zero;
|
|
|
|
TimeSpan offset;
|
|
if (tz.TryGetTransitionOffset(dateTime, out offset, out isDST))
|
|
return offset;
|
|
|
|
if (dateTime.Kind == DateTimeKind.Utc) {
|
|
var utcRule = tz.GetApplicableRule (dateTime);
|
|
if (utcRule != null && tz.IsInDST (utcRule, dateTime)) {
|
|
isDST = true;
|
|
return tz.BaseUtcOffset + utcRule.DaylightDelta;
|
|
}
|
|
|
|
return tz.BaseUtcOffset;
|
|
}
|
|
|
|
DateTime stdUtcDateTime;
|
|
if (!TryAddTicks (dateTime, -tz.BaseUtcOffset.Ticks, out stdUtcDateTime, DateTimeKind.Utc))
|
|
return tz.BaseUtcOffset;
|
|
|
|
var tzRule = tz.GetApplicableRule (stdUtcDateTime);
|
|
|
|
DateTime dstUtcDateTime = DateTime.MinValue;
|
|
if (tzRule != null) {
|
|
if (!TryAddTicks (stdUtcDateTime, -tzRule.DaylightDelta.Ticks, out dstUtcDateTime, DateTimeKind.Utc))
|
|
return tz.BaseUtcOffset;
|
|
}
|
|
|
|
if (tzRule != null && tz.IsInDST (tzRule, stdUtcDateTime) && tz.IsInDST (tzRule, dstUtcDateTime)) {
|
|
isDST = true;
|
|
return tz.BaseUtcOffset + tzRule.DaylightDelta;
|
|
}
|
|
|
|
return tz.BaseUtcOffset;
|
|
}
|
|
|
|
public bool HasSameRules (TimeZoneInfo other)
|
|
{
|
|
if (other == null)
|
|
throw new ArgumentNullException ("other");
|
|
|
|
if ((this.adjustmentRules == null) != (other.adjustmentRules == null))
|
|
return false;
|
|
|
|
if (this.adjustmentRules == null)
|
|
return true;
|
|
|
|
if (this.BaseUtcOffset != other.BaseUtcOffset)
|
|
return false;
|
|
|
|
if (this.adjustmentRules.Length != other.adjustmentRules.Length)
|
|
return false;
|
|
|
|
for (int i = 0; i < adjustmentRules.Length; i++) {
|
|
if (! (this.adjustmentRules [i]).Equals (other.adjustmentRules [i]))
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
public bool IsAmbiguousTime (DateTime dateTime)
|
|
{
|
|
if (dateTime.Kind == DateTimeKind.Local && IsInvalidTime (dateTime))
|
|
throw new ArgumentException ("Kind is Local and time is Invalid");
|
|
|
|
if (this == TimeZoneInfo.Utc)
|
|
return false;
|
|
|
|
if (dateTime.Kind == DateTimeKind.Utc)
|
|
dateTime = ConvertTimeFromUtc (dateTime);
|
|
|
|
if (dateTime.Kind == DateTimeKind.Local && this != TimeZoneInfo.Local)
|
|
dateTime = ConvertTime (dateTime, TimeZoneInfo.Local, this);
|
|
|
|
AdjustmentRule rule = GetApplicableRule (dateTime);
|
|
if (rule != null) {
|
|
DateTime tpoint = TransitionPoint (rule.DaylightTransitionEnd, dateTime.Year);
|
|
if (dateTime > tpoint - rule.DaylightDelta && dateTime <= tpoint)
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
public bool IsAmbiguousTime (DateTimeOffset dateTimeOffset)
|
|
{
|
|
throw new NotImplementedException ();
|
|
}
|
|
|
|
private bool IsInDST (AdjustmentRule rule, DateTime dateTime)
|
|
{
|
|
// Check whether we're in the dateTime year's DST period
|
|
if (IsInDSTForYear (rule, dateTime, dateTime.Year))
|
|
return true;
|
|
|
|
// We might be in the dateTime previous year's DST period
|
|
return IsInDSTForYear (rule, dateTime, dateTime.Year - 1);
|
|
}
|
|
|
|
bool IsInDSTForYear (AdjustmentRule rule, DateTime dateTime, int year)
|
|
{
|
|
DateTime DST_start = TransitionPoint (rule.DaylightTransitionStart, year);
|
|
DateTime DST_end = TransitionPoint (rule.DaylightTransitionEnd, year + ((rule.DaylightTransitionStart.Month < rule.DaylightTransitionEnd.Month) ? 0 : 1));
|
|
if (dateTime.Kind == DateTimeKind.Utc) {
|
|
DST_start -= BaseUtcOffset;
|
|
DST_end -= (BaseUtcOffset + rule.DaylightDelta);
|
|
}
|
|
|
|
return (dateTime >= DST_start && dateTime < DST_end);
|
|
}
|
|
|
|
public bool IsDaylightSavingTime (DateTime dateTime)
|
|
{
|
|
if (dateTime.Kind == DateTimeKind.Local && IsInvalidTime (dateTime))
|
|
throw new ArgumentException ("dateTime is invalid and Kind is Local");
|
|
|
|
if (this == TimeZoneInfo.Utc)
|
|
return false;
|
|
|
|
if (!SupportsDaylightSavingTime)
|
|
return false;
|
|
|
|
bool isDst;
|
|
GetUtcOffset (dateTime, out isDst);
|
|
|
|
return isDst;
|
|
}
|
|
|
|
internal bool IsDaylightSavingTime (DateTime dateTime, TimeZoneInfoOptions flags)
|
|
{
|
|
return IsDaylightSavingTime (dateTime);
|
|
}
|
|
|
|
public bool IsDaylightSavingTime (DateTimeOffset dateTimeOffset)
|
|
{
|
|
throw new NotImplementedException ();
|
|
}
|
|
|
|
public bool IsInvalidTime (DateTime dateTime)
|
|
{
|
|
if (dateTime.Kind == DateTimeKind.Utc)
|
|
return false;
|
|
if (dateTime.Kind == DateTimeKind.Local && this != Local)
|
|
return false;
|
|
|
|
AdjustmentRule rule = GetApplicableRule (dateTime);
|
|
if (rule != null) {
|
|
DateTime tpoint = TransitionPoint (rule.DaylightTransitionStart, dateTime.Year);
|
|
if (dateTime >= tpoint && dateTime < tpoint + rule.DaylightDelta)
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
void IDeserializationCallback.OnDeserialization (object sender)
|
|
{
|
|
try {
|
|
TimeZoneInfo.Validate (id, baseUtcOffset, adjustmentRules);
|
|
} catch (ArgumentException ex) {
|
|
throw new SerializationException ("invalid serialization data", ex);
|
|
}
|
|
}
|
|
|
|
private static void Validate (string id, TimeSpan baseUtcOffset, AdjustmentRule [] adjustmentRules)
|
|
{
|
|
if (id == null)
|
|
throw new ArgumentNullException ("id");
|
|
|
|
if (id == String.Empty)
|
|
throw new ArgumentException ("id parameter is an empty string");
|
|
|
|
if (baseUtcOffset.Ticks % TimeSpan.TicksPerMinute != 0)
|
|
throw new ArgumentException ("baseUtcOffset parameter does not represent a whole number of minutes");
|
|
|
|
if (baseUtcOffset > new TimeSpan (14, 0, 0) || baseUtcOffset < new TimeSpan (-14, 0, 0))
|
|
throw new ArgumentOutOfRangeException ("baseUtcOffset parameter is greater than 14 hours or less than -14 hours");
|
|
|
|
#if STRICT
|
|
if (id.Length > 32)
|
|
throw new ArgumentException ("id parameter shouldn't be longer than 32 characters");
|
|
#endif
|
|
|
|
if (adjustmentRules != null && adjustmentRules.Length != 0) {
|
|
AdjustmentRule prev = null;
|
|
foreach (AdjustmentRule current in adjustmentRules) {
|
|
if (current == null)
|
|
throw new InvalidTimeZoneException ("one or more elements in adjustmentRules are null");
|
|
|
|
if ((baseUtcOffset + current.DaylightDelta < new TimeSpan (-14, 0, 0)) ||
|
|
(baseUtcOffset + current.DaylightDelta > new TimeSpan (14, 0, 0)))
|
|
throw new InvalidTimeZoneException ("Sum of baseUtcOffset and DaylightDelta of one or more object in adjustmentRules array is greater than 14 or less than -14 hours;");
|
|
|
|
if (prev != null && prev.DateStart > current.DateStart)
|
|
throw new InvalidTimeZoneException ("adjustment rules specified in adjustmentRules parameter are not in chronological order");
|
|
|
|
if (prev != null && prev.DateEnd > current.DateStart)
|
|
throw new InvalidTimeZoneException ("some adjustment rules in the adjustmentRules parameter overlap");
|
|
|
|
if (prev != null && prev.DateEnd == current.DateStart)
|
|
throw new InvalidTimeZoneException ("a date can have multiple adjustment rules applied to it");
|
|
|
|
prev = current;
|
|
}
|
|
}
|
|
}
|
|
|
|
public override string ToString ()
|
|
{
|
|
return DisplayName;
|
|
}
|
|
|
|
private TimeZoneInfo (SerializationInfo info, StreamingContext context)
|
|
{
|
|
if (info == null)
|
|
throw new ArgumentNullException ("info");
|
|
id = (string) info.GetValue ("Id", typeof (string));
|
|
displayName = (string) info.GetValue ("DisplayName", typeof (string));
|
|
standardDisplayName = (string) info.GetValue ("StandardName", typeof (string));
|
|
daylightDisplayName = (string) info.GetValue ("DaylightName", typeof (string));
|
|
baseUtcOffset = (TimeSpan) info.GetValue ("BaseUtcOffset", typeof (TimeSpan));
|
|
adjustmentRules = (TimeZoneInfo.AdjustmentRule []) info.GetValue ("AdjustmentRules", typeof (TimeZoneInfo.AdjustmentRule []));
|
|
supportsDaylightSavingTime = (bool) info.GetValue ("SupportsDaylightSavingTime", typeof (bool));
|
|
}
|
|
|
|
private TimeZoneInfo (string id, TimeSpan baseUtcOffset, string displayName, string standardDisplayName, string daylightDisplayName, TimeZoneInfo.AdjustmentRule [] adjustmentRules, bool disableDaylightSavingTime)
|
|
{
|
|
if (id == null)
|
|
throw new ArgumentNullException ("id");
|
|
|
|
if (id == String.Empty)
|
|
throw new ArgumentException ("id parameter is an empty string");
|
|
|
|
if (baseUtcOffset.Ticks % TimeSpan.TicksPerMinute != 0)
|
|
throw new ArgumentException ("baseUtcOffset parameter does not represent a whole number of minutes");
|
|
|
|
if (baseUtcOffset > new TimeSpan (14, 0, 0) || baseUtcOffset < new TimeSpan (-14, 0, 0))
|
|
throw new ArgumentOutOfRangeException ("baseUtcOffset parameter is greater than 14 hours or less than -14 hours");
|
|
|
|
#if STRICT
|
|
if (id.Length > 32)
|
|
throw new ArgumentException ("id parameter shouldn't be longer than 32 characters");
|
|
#endif
|
|
|
|
bool supportsDaylightSavingTime = !disableDaylightSavingTime;
|
|
|
|
if (adjustmentRules != null && adjustmentRules.Length != 0) {
|
|
AdjustmentRule prev = null;
|
|
foreach (AdjustmentRule current in adjustmentRules) {
|
|
if (current == null)
|
|
throw new InvalidTimeZoneException ("one or more elements in adjustmentRules are null");
|
|
|
|
if ((baseUtcOffset + current.DaylightDelta < new TimeSpan (-14, 0, 0)) ||
|
|
(baseUtcOffset + current.DaylightDelta > new TimeSpan (14, 0, 0)))
|
|
throw new InvalidTimeZoneException ("Sum of baseUtcOffset and DaylightDelta of one or more object in adjustmentRules array is greater than 14 or less than -14 hours;");
|
|
|
|
if (prev != null && prev.DateStart > current.DateStart)
|
|
throw new InvalidTimeZoneException ("adjustment rules specified in adjustmentRules parameter are not in chronological order");
|
|
|
|
if (prev != null && prev.DateEnd > current.DateStart)
|
|
throw new InvalidTimeZoneException ("some adjustment rules in the adjustmentRules parameter overlap");
|
|
|
|
if (prev != null && prev.DateEnd == current.DateStart)
|
|
throw new InvalidTimeZoneException ("a date can have multiple adjustment rules applied to it");
|
|
|
|
prev = current;
|
|
}
|
|
} else {
|
|
supportsDaylightSavingTime = false;
|
|
}
|
|
|
|
this.id = id;
|
|
this.baseUtcOffset = baseUtcOffset;
|
|
this.displayName = displayName ?? id;
|
|
this.standardDisplayName = standardDisplayName ?? id;
|
|
this.daylightDisplayName = daylightDisplayName;
|
|
this.supportsDaylightSavingTime = supportsDaylightSavingTime;
|
|
this.adjustmentRules = adjustmentRules;
|
|
}
|
|
|
|
private AdjustmentRule GetApplicableRule (DateTime dateTime)
|
|
{
|
|
//Applicable rules are in standard time
|
|
DateTime date = dateTime;
|
|
|
|
if (dateTime.Kind == DateTimeKind.Local && this != TimeZoneInfo.Local) {
|
|
if (!TryAddTicks (date.ToUniversalTime (), BaseUtcOffset.Ticks, out date))
|
|
return null;
|
|
} else if (dateTime.Kind == DateTimeKind.Utc && this != TimeZoneInfo.Utc) {
|
|
if (!TryAddTicks (date, BaseUtcOffset.Ticks, out date))
|
|
return null;
|
|
}
|
|
|
|
// get the date component of the datetime
|
|
date = date.Date;
|
|
|
|
if (adjustmentRules != null) {
|
|
foreach (AdjustmentRule rule in adjustmentRules) {
|
|
if (rule.DateStart > date)
|
|
return null;
|
|
if (rule.DateEnd < date)
|
|
continue;
|
|
return rule;
|
|
}
|
|
}
|
|
return null;
|
|
}
|
|
|
|
private bool TryGetTransitionOffset (DateTime dateTime, out TimeSpan offset,out bool isDst)
|
|
{
|
|
offset = BaseUtcOffset;
|
|
isDst = false;
|
|
|
|
if (transitions == null)
|
|
return false;
|
|
|
|
//Transitions are in UTC
|
|
DateTime date = dateTime;
|
|
|
|
if (dateTime.Kind == DateTimeKind.Local && this != TimeZoneInfo.Local) {
|
|
if (!TryAddTicks (date.ToUniversalTime (), BaseUtcOffset.Ticks, out date, DateTimeKind.Utc))
|
|
return false;
|
|
}
|
|
|
|
if (dateTime.Kind != DateTimeKind.Utc) {
|
|
if (!TryAddTicks (date, -BaseUtcOffset.Ticks, out date, DateTimeKind.Utc))
|
|
return false;
|
|
}
|
|
|
|
for (var i = transitions.Count - 1; i >= 0; i--) {
|
|
var pair = transitions [i];
|
|
DateTime ttime = pair.Key;
|
|
TimeType ttype = pair.Value;
|
|
|
|
if (ttime > date)
|
|
continue;
|
|
|
|
offset = new TimeSpan (0, 0, ttype.Offset);
|
|
isDst = ttype.IsDst;
|
|
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
private static DateTime TransitionPoint (TransitionTime transition, int year)
|
|
{
|
|
if (transition.IsFixedDateRule)
|
|
return new DateTime (year, transition.Month, transition.Day) + transition.TimeOfDay.TimeOfDay;
|
|
|
|
DayOfWeek first = (new DateTime (year, transition.Month, 1)).DayOfWeek;
|
|
int day = 1 + (transition.Week - 1) * 7 + (transition.DayOfWeek - first + 7) % 7;
|
|
if (day > DateTime.DaysInMonth (year, transition.Month))
|
|
day -= 7;
|
|
if (day < 1)
|
|
day += 7;
|
|
return new DateTime (year, transition.Month, day) + transition.TimeOfDay.TimeOfDay;
|
|
}
|
|
|
|
static List<AdjustmentRule> ValidateRules (List<AdjustmentRule> adjustmentRules)
|
|
{
|
|
AdjustmentRule prev = null;
|
|
foreach (AdjustmentRule current in adjustmentRules.ToArray ()) {
|
|
if (prev != null && prev.DateEnd > current.DateStart) {
|
|
adjustmentRules.Remove (current);
|
|
}
|
|
prev = current;
|
|
}
|
|
return adjustmentRules;
|
|
}
|
|
|
|
#if LIBC || MONODROID
|
|
private static bool ValidTZFile (byte [] buffer, int length)
|
|
{
|
|
StringBuilder magic = new StringBuilder ();
|
|
|
|
for (int i = 0; i < 4; i++)
|
|
magic.Append ((char)buffer [i]);
|
|
|
|
if (magic.ToString () != "TZif")
|
|
return false;
|
|
|
|
if (length >= BUFFER_SIZE)
|
|
return false;
|
|
|
|
return true;
|
|
}
|
|
|
|
static int SwapInt32 (int i)
|
|
{
|
|
return (((i >> 24) & 0xff)
|
|
| ((i >> 8) & 0xff00)
|
|
| ((i << 8) & 0xff0000)
|
|
| ((i << 24)));
|
|
}
|
|
|
|
static int ReadBigEndianInt32 (byte [] buffer, int start)
|
|
{
|
|
int i = BitConverter.ToInt32 (buffer, start);
|
|
if (!BitConverter.IsLittleEndian)
|
|
return i;
|
|
|
|
return SwapInt32 (i);
|
|
}
|
|
|
|
private static TimeZoneInfo ParseTZBuffer (string id, byte [] buffer, int length)
|
|
{
|
|
//Reading the header. 4 bytes for magic, 16 are reserved
|
|
int ttisgmtcnt = ReadBigEndianInt32 (buffer, 20);
|
|
int ttisstdcnt = ReadBigEndianInt32 (buffer, 24);
|
|
int leapcnt = ReadBigEndianInt32 (buffer, 28);
|
|
int timecnt = ReadBigEndianInt32 (buffer, 32);
|
|
int typecnt = ReadBigEndianInt32 (buffer, 36);
|
|
int charcnt = ReadBigEndianInt32 (buffer, 40);
|
|
|
|
if (length < 44 + timecnt * 5 + typecnt * 6 + charcnt + leapcnt * 8 + ttisstdcnt + ttisgmtcnt)
|
|
throw new InvalidTimeZoneException ();
|
|
|
|
Dictionary<int, string> abbreviations = ParseAbbreviations (buffer, 44 + 4 * timecnt + timecnt + 6 * typecnt, charcnt);
|
|
Dictionary<int, TimeType> time_types = ParseTimesTypes (buffer, 44 + 4 * timecnt + timecnt, typecnt, abbreviations);
|
|
List<KeyValuePair<DateTime, TimeType>> transitions = ParseTransitions (buffer, 44, timecnt, time_types);
|
|
|
|
if (time_types.Count == 0)
|
|
throw new InvalidTimeZoneException ();
|
|
|
|
if (time_types.Count == 1 && ((TimeType)time_types[0]).IsDst)
|
|
throw new InvalidTimeZoneException ();
|
|
|
|
TimeSpan baseUtcOffset = new TimeSpan (0);
|
|
TimeSpan dstDelta = new TimeSpan (0);
|
|
string standardDisplayName = null;
|
|
string daylightDisplayName = null;
|
|
bool dst_observed = false;
|
|
DateTime dst_start = DateTime.MinValue;
|
|
List<AdjustmentRule> adjustmentRules = new List<AdjustmentRule> ();
|
|
bool storeTransition = false;
|
|
|
|
for (int i = 0; i < transitions.Count; i++) {
|
|
var pair = transitions [i];
|
|
DateTime ttime = pair.Key;
|
|
TimeType ttype = pair.Value;
|
|
if (!ttype.IsDst) {
|
|
if (standardDisplayName != ttype.Name)
|
|
standardDisplayName = ttype.Name;
|
|
if (baseUtcOffset.TotalSeconds != ttype.Offset) {
|
|
baseUtcOffset = new TimeSpan (0, 0, ttype.Offset);
|
|
if (adjustmentRules.Count > 0) // We ignore AdjustmentRules but store transitions.
|
|
storeTransition = true;
|
|
adjustmentRules = new List<AdjustmentRule> ();
|
|
dst_observed = false;
|
|
}
|
|
if (dst_observed) {
|
|
//FIXME: check additional fields for this:
|
|
//most of the transitions are expressed in GMT
|
|
dst_start += baseUtcOffset;
|
|
DateTime dst_end = ttime + baseUtcOffset + dstDelta;
|
|
|
|
//some weird timezone (America/Phoenix) have end dates on Jan 1st
|
|
if (dst_end.Date == new DateTime (dst_end.Year, 1, 1) && dst_end.Year > dst_start.Year)
|
|
dst_end -= new TimeSpan (24, 0, 0);
|
|
|
|
/*
|
|
* AdjustmentRule specifies a DST period that starts and ends within a year.
|
|
* When we have a DST period longer than a year, the generated AdjustmentRule may not be usable.
|
|
* Thus we fallback to the transitions.
|
|
*/
|
|
if (dst_start.AddYears (1) < dst_end)
|
|
storeTransition = true;
|
|
|
|
DateTime dateStart, dateEnd;
|
|
if (dst_start.Month < 7)
|
|
dateStart = new DateTime (dst_start.Year, 1, 1);
|
|
else
|
|
dateStart = new DateTime (dst_start.Year, 7, 1);
|
|
|
|
if (dst_end.Month >= 7)
|
|
dateEnd = new DateTime (dst_end.Year, 12, 31);
|
|
else
|
|
dateEnd = new DateTime (dst_end.Year, 6, 30);
|
|
|
|
|
|
TransitionTime transition_start = TransitionTime.CreateFixedDateRule (new DateTime (1, 1, 1) + dst_start.TimeOfDay, dst_start.Month, dst_start.Day);
|
|
TransitionTime transition_end = TransitionTime.CreateFixedDateRule (new DateTime (1, 1, 1) + dst_end.TimeOfDay, dst_end.Month, dst_end.Day);
|
|
if (transition_start != transition_end) //y, that happened in Argentina in 1943-1946
|
|
adjustmentRules.Add (AdjustmentRule.CreateAdjustmentRule (dateStart, dateEnd, dstDelta, transition_start, transition_end));
|
|
}
|
|
dst_observed = false;
|
|
} else {
|
|
if (daylightDisplayName != ttype.Name)
|
|
daylightDisplayName = ttype.Name;
|
|
if (dstDelta.TotalSeconds != ttype.Offset - baseUtcOffset.TotalSeconds)
|
|
dstDelta = new TimeSpan(0, 0, ttype.Offset) - baseUtcOffset;
|
|
|
|
dst_start = ttime;
|
|
dst_observed = true;
|
|
}
|
|
}
|
|
|
|
TimeZoneInfo tz;
|
|
if (adjustmentRules.Count == 0 && !storeTransition) {
|
|
TimeType t = (TimeType)time_types [0];
|
|
if (standardDisplayName == null) {
|
|
standardDisplayName = t.Name;
|
|
baseUtcOffset = new TimeSpan (0, 0, t.Offset);
|
|
}
|
|
tz = CreateCustomTimeZone (id, baseUtcOffset, id, standardDisplayName);
|
|
} else {
|
|
tz = CreateCustomTimeZone (id, baseUtcOffset, id, standardDisplayName, daylightDisplayName, ValidateRules (adjustmentRules).ToArray ());
|
|
}
|
|
|
|
if (storeTransition)
|
|
tz.transitions = transitions;
|
|
|
|
return tz;
|
|
}
|
|
|
|
static Dictionary<int, string> ParseAbbreviations (byte [] buffer, int index, int count)
|
|
{
|
|
var abbrevs = new Dictionary<int, string> ();
|
|
int abbrev_index = 0;
|
|
var sb = new StringBuilder ();
|
|
for (int i = 0; i < count; i++) {
|
|
char c = (char) buffer [index + i];
|
|
if (c != '\0')
|
|
sb.Append (c);
|
|
else {
|
|
abbrevs.Add (abbrev_index, sb.ToString ());
|
|
//Adding all the substrings too, as it seems to be used, at least for Africa/Windhoek
|
|
for (int j = 1; j < sb.Length; j++)
|
|
abbrevs.Add (abbrev_index + j, sb.ToString (j, sb.Length - j));
|
|
abbrev_index = i + 1;
|
|
sb = new StringBuilder ();
|
|
}
|
|
}
|
|
return abbrevs;
|
|
}
|
|
|
|
static Dictionary<int, TimeType> ParseTimesTypes (byte [] buffer, int index, int count, Dictionary<int, string> abbreviations)
|
|
{
|
|
var types = new Dictionary<int, TimeType> (count);
|
|
for (int i = 0; i < count; i++) {
|
|
int offset = ReadBigEndianInt32 (buffer, index + 6 * i);
|
|
byte is_dst = buffer [index + 6 * i + 4];
|
|
byte abbrev = buffer [index + 6 * i + 5];
|
|
types.Add (i, new TimeType (offset, (is_dst != 0), abbreviations [(int)abbrev]));
|
|
}
|
|
return types;
|
|
}
|
|
|
|
static List<KeyValuePair<DateTime, TimeType>> ParseTransitions (byte [] buffer, int index, int count, Dictionary<int, TimeType> time_types)
|
|
{
|
|
var list = new List<KeyValuePair<DateTime, TimeType>> (count);
|
|
for (int i = 0; i < count; i++) {
|
|
int unixtime = ReadBigEndianInt32 (buffer, index + 4 * i);
|
|
DateTime ttime = DateTimeFromUnixTime (unixtime);
|
|
byte ttype = buffer [index + 4 * count + i];
|
|
list.Add (new KeyValuePair<DateTime, TimeType> (ttime, time_types [(int)ttype]));
|
|
}
|
|
return list;
|
|
}
|
|
|
|
static DateTime DateTimeFromUnixTime (long unix_time)
|
|
{
|
|
DateTime date_time = new DateTime (1970, 1, 1);
|
|
return date_time.AddSeconds (unix_time);
|
|
}
|
|
|
|
#region reference sources
|
|
// Shortcut for TimeZoneInfo.Local.GetUtcOffset
|
|
internal static TimeSpan GetLocalUtcOffset(DateTime dateTime, TimeZoneInfoOptions flags)
|
|
{
|
|
bool dst;
|
|
return Local.GetUtcOffset (dateTime, out dst);
|
|
}
|
|
|
|
internal TimeSpan GetUtcOffset(DateTime dateTime, TimeZoneInfoOptions flags)
|
|
{
|
|
bool dst;
|
|
return GetUtcOffset (dateTime, out dst);
|
|
}
|
|
|
|
static internal TimeSpan GetUtcOffsetFromUtc (DateTime time, TimeZoneInfo zone, out Boolean isDaylightSavings, out Boolean isAmbiguousLocalDst)
|
|
{
|
|
isDaylightSavings = false;
|
|
isAmbiguousLocalDst = false;
|
|
TimeSpan baseOffset = zone.BaseUtcOffset;
|
|
|
|
if (zone.IsAmbiguousTime (time)) {
|
|
isAmbiguousLocalDst = true;
|
|
return baseOffset;
|
|
}
|
|
|
|
return zone.GetUtcOffset (time, out isDaylightSavings);
|
|
}
|
|
#endregion
|
|
}
|
|
|
|
struct TimeType {
|
|
public readonly int Offset;
|
|
public readonly bool IsDst;
|
|
public string Name;
|
|
|
|
public TimeType (int offset, bool is_dst, string abbrev)
|
|
{
|
|
this.Offset = offset;
|
|
this.IsDst = is_dst;
|
|
this.Name = abbrev;
|
|
}
|
|
|
|
public override string ToString ()
|
|
{
|
|
return "offset: " + Offset + "s, is_dst: " + IsDst + ", zone name: " + Name;
|
|
}
|
|
#else
|
|
}
|
|
#endif
|
|
}
|
|
}
|