53 lines
1.8 KiB
C#
53 lines
1.8 KiB
C#
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//------------------------------------------------------------------------------
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// <copyright file="FileChangesMonitor.cs" company="Microsoft">
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// Copyright (c) Microsoft Corporation. All rights reserved.
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// </copyright>
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//------------------------------------------------------------------------------
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namespace System.Web.Util {
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using System;
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internal sealed class DateTimeUtil {
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private DateTimeUtil() {}
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const long FileTimeOffset = 504911232000000000;
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static readonly DateTime MinValuePlusOneDay = DateTime.MinValue.AddDays(1);
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static readonly DateTime MaxValueMinusOneDay = DateTime.MaxValue.AddDays(-1);
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static internal DateTime FromFileTimeToUtc(long filetime) {
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long universalTicks = filetime + FileTimeOffset;
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// Dev10 733288: Caching: behavior change for CacheDependency when using UseMemoryCache=1
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// ObjectCacheHost converts DateTime to a DateTimeOffset, and the conversion requires
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// that DateTimeKind be set correctly
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return new DateTime(universalTicks, DateTimeKind.Utc);
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}
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static internal DateTime ConvertToUniversalTime(DateTime localTime) {
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if (localTime < MinValuePlusOneDay) {
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return DateTime.MinValue;
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}
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if (localTime > MaxValueMinusOneDay) {
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return DateTime.MaxValue;
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}
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return localTime.ToUniversalTime();
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}
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static internal DateTime ConvertToLocalTime(DateTime utcTime) {
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if (utcTime < MinValuePlusOneDay) {
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return DateTime.MinValue;
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}
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if (utcTime > MaxValueMinusOneDay) {
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return DateTime.MaxValue;
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}
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return utcTime.ToLocalTime();
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}
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}
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}
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