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//------------------------------------------------------------------------------
// <copyright file="FileChangesMonitor.cs" company="Microsoft">
// Copyright (c) Microsoft Corporation. All rights reserved.
// </copyright>
//------------------------------------------------------------------------------
namespace System.Web.Util {
using System;
internal enum TimeUnit {
Unknown = 0,
Days,
Hours,
Minutes,
Seconds,
Milliseconds
};
internal sealed class DateTimeUtil {
private DateTimeUtil() {}
const long FileTimeOffset = 504911232000000000;
static readonly DateTime MinValuePlusOneDay = DateTime.MinValue.AddDays(1);
static readonly DateTime MaxValueMinusOneDay = DateTime.MaxValue.AddDays(-1);
static internal DateTime FromFileTimeToUtc(long filetime) {
long universalTicks = filetime + FileTimeOffset;
// Dev10 733288: Caching: behavior change for CacheDependency when using UseMemoryCache=1
// ObjectCacheHost converts DateTime to a DateTimeOffset, and the conversion requires
// that DateTimeKind be set correctly
return new DateTime(universalTicks, DateTimeKind.Utc);
}
static internal DateTime ConvertToUniversalTime(DateTime localTime) {
if (localTime < MinValuePlusOneDay) {
return DateTime.MinValue;
}
if (localTime > MaxValueMinusOneDay) {
return DateTime.MaxValue;
}
return localTime.ToUniversalTime();
}
static internal DateTime ConvertToLocalTime(DateTime utcTime) {
if (utcTime < MinValuePlusOneDay) {
return DateTime.MinValue;
}
if (utcTime > MaxValueMinusOneDay) {
return DateTime.MaxValue;
}
return utcTime.ToLocalTime();
}
static internal TimeSpan GetTimeoutFromTimeUnit(int timeoutValue, TimeUnit timeoutUnit) {
switch (timeoutUnit) {
case TimeUnit.Days:
return new TimeSpan(timeoutValue, 0, 0, 0);
case TimeUnit.Hours:
return new TimeSpan(timeoutValue, 0, 0);
case TimeUnit.Seconds:
return new TimeSpan(0, 0, timeoutValue);
case TimeUnit.Milliseconds:
return new TimeSpan(0, 0, 0, 0, timeoutValue);
case TimeUnit.Minutes:
return new TimeSpan(0, timeoutValue, 0);
case TimeUnit.Unknown:
default:
break;
}
throw new ArgumentException(SR.GetString(SR.InvalidArgumentValue, "timeoutUnit"));
}
}
}
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