83 lines
2.7 KiB
C#
83 lines
2.7 KiB
C#
//------------------------------------------------------------
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// Copyright (c) Microsoft Corporation. All rights reserved.
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//------------------------------------------------------------
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using System;
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using System.Collections.Generic;
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using System.Text;
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namespace System.IdentityModel
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{
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static class DateTimeUtil
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{
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/// <summary>
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/// Add a DateTime and a TimeSpan.
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/// The maximum time is DateTime.MaxTime. It is not an error if time + timespan > MaxTime.
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/// Just return MaxTime.
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/// </summary>
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/// <param name="time">Initial <see cref="DateTime"/> value.</param>
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/// <param name="timespan"><see cref="TimeSpan"/> to add.</param>
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/// <returns></returns>
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public static DateTime Add(DateTime time, TimeSpan timespan)
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{
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if (timespan >= TimeSpan.Zero && DateTime.MaxValue - time <= timespan)
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{
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return GetMaxValue(time.Kind);
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}
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if (timespan <= TimeSpan.Zero && DateTime.MinValue - time >= timespan)
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{
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return GetMinValue(time.Kind);
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}
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return time + timespan;
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}
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/// <summary>
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/// Add a DateTime and a non-negative TimeSpan.
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/// The maximum time is DateTime.MaxTime. It is not an error if time + timespan > MaxTime.
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/// Just return MaxTime. If TimeSpan is < TimeSpan.Zero, throw exception.
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/// </summary>
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/// <param name="time"></param>
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/// <param name="timespan"></param>
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/// <returns></returns>
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public static DateTime AddNonNegative(DateTime time, TimeSpan timespan)
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{
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if (timespan <= TimeSpan.Zero)
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{
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throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new InvalidOperationException(SR.GetString(SR.ID2082)));
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}
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return Add(time, timespan);
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}
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public static DateTime GetMaxValue(DateTimeKind kind)
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{
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return new DateTime(DateTime.MaxValue.Ticks, kind);
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}
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public static DateTime GetMinValue(DateTimeKind kind)
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{
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return new DateTime(DateTime.MinValue.Ticks, kind);
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}
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public static DateTime? ToUniversalTime(DateTime? value)
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{
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if (null == value || value.Value.Kind == DateTimeKind.Utc)
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{
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return value;
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}
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return ToUniversalTime(value.Value);
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}
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public static DateTime ToUniversalTime(DateTime value)
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{
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if (value.Kind == DateTimeKind.Utc)
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{
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return value;
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}
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return value.ToUniversalTime();
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}
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}
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}
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