private static DaylightTime CreateDaylightChanges(int year)
{
DaylightTime currentDaylightChanges = null;
if (TimeZoneInfo.Local.SupportsDaylightSavingTime)
{
DateTime start;
DateTime end;
TimeSpan delta;
foreach (var rule in TimeZoneInfo.Local.GetAdjustmentRules())
{
if (rule.DateStart.Year <= year && rule.DateEnd.Year >= year && rule.DaylightDelta != TimeSpan.Zero)
{
start = TimeZoneInfo.TransitionTimeToDateTime(year, rule.DaylightTransitionStart);
end = TimeZoneInfo.TransitionTimeToDateTime(year, rule.DaylightTransitionEnd);
delta = rule.DaylightDelta;
currentDaylightChanges = new DaylightTime(start, end, delta);
break;
}
}
}
if (currentDaylightChanges == null)
{
currentDaylightChanges = new DaylightTime(DateTime.MinValue, DateTime.MinValue, TimeSpan.Zero);
}
return(currentDaylightChanges);
}
public override DaylightTime GetDaylightChanges(int year)
{
if (year < 1 || year > 9999)
{
throw new ArgumentOutOfRangeException(nameof(year), Environment.GetResourceString("ArgumentOutOfRange_Range", 1, 9999));
}
Contract.EndContractBlock();
Object objYear = (Object)year;
if (!m_CachedDaylightChanges.Contains(objYear))
{
DaylightTime currentDaylightChanges = null;
if (TimeZoneInfo.Local.SupportsDaylightSavingTime)
{
DateTime start;
DateTime end;
TimeSpan delta;
foreach (var rule in TimeZoneInfo.Local.GetAdjustmentRules())
{
if (rule.DateStart.Year <= year && rule.DateEnd.Year >= year && rule.DaylightDelta != TimeSpan.Zero)
{
start = TimeZoneInfo.TransitionTimeToDateTime(year, rule.DaylightTransitionStart);
end = TimeZoneInfo.TransitionTimeToDateTime(year, rule.DaylightTransitionEnd);
delta = rule.DaylightDelta;
currentDaylightChanges = new DaylightTime(start, end, delta);
break;
}
}
}
if (currentDaylightChanges == null)
{
currentDaylightChanges = new DaylightTime(DateTime.MinValue, DateTime.MinValue, TimeSpan.Zero);
}
lock (m_CachedDaylightChanges)
{
if (!m_CachedDaylightChanges.Contains(objYear))
{
m_CachedDaylightChanges.Add(objYear, currentDaylightChanges);
}
}
}
DaylightTime result = (DaylightTime)m_CachedDaylightChanges[objYear];
return(result);
}
private static DaylightTime CreateDaylightChanges(int year)
{
DateTime start = DateTime.MinValue;
DateTime end = DateTime.MinValue;
TimeSpan delta = TimeSpan.Zero;
if (TimeZoneInfo.Local.SupportsDaylightSavingTime)
{
foreach (TimeZoneInfo.AdjustmentRule rule in TimeZoneInfo.Local.GetAdjustmentRules())
{
if (rule.DateStart.Year <= year && rule.DateEnd.Year >= year && rule.DaylightDelta != TimeSpan.Zero)
{
start = TimeZoneInfo.TransitionTimeToDateTime(year, rule.DaylightTransitionStart);
end = TimeZoneInfo.TransitionTimeToDateTime(year, rule.DaylightTransitionEnd);
delta = rule.DaylightDelta;
break;
}
}
}
return(new DaylightTime(start, end, delta));
}