private void ParseDayLightTime(DaylightTime dayLightTime)
{
var startTime = dayLightTime.Start;
var endTime = dayLightTime.End;
var delta = dayLightTime.Delta;
if (startTime.TimeOfDay > endTime.TimeOfDay)
{
// Clock move backward
AmbiguiousTimeStart = startTime.Subtract(delta);
AmbiguiousTimeEnd = startTime;
InvalidTimeStart = endTime;
InvalidTimeEnd = endTime.Add(delta);
}
else
{
// Clock move forward
AmbiguiousTimeStart = endTime.Subtract(delta);
AmbiguiousTimeEnd = endTime;
InvalidTimeStart = startTime;
InvalidTimeEnd = startTime.Add(delta);
}
if (startTime > endTime)
{
DayLightSavingTimeStart = InvalidTimeEnd;
var monthOfYear = MonthOfYear.Of(12, Year.GetYear());
DayLightSavingTimeEnd = new DateTime(monthOfYear.Year.GetYear(), monthOfYear.Month.GetMonth(), monthOfYear.TotalDays, 12, 59, 59, 999);
}
else
{
DayLightSavingTimeStart = new DateTime(Year.GetYear(), 1, 1, 12, 0, 0, 0);
DayLightSavingTimeEnd = AmbiguiousTimeStart;
}
}
internal static DaylightTime GetDaylightTime(TimeZoneInfo timeZone, int year)
{
var adjustRule = timeZone
.GetAdjustmentRules()
.SingleOrDefault(rule => rule.DateStart.Year <= year && rule.DateEnd.Year >= year);
// There is no Day Light Time Saving of this year in this time zone
if (adjustRule == null)
{
return(null);
}
var start = adjustRule.DaylightTransitionStart;
var end = adjustRule.DaylightTransitionEnd;
var startDate = start.IsFixedDateRule
? Dates.Of(year, Month.Of(start.Month), start.Day).Add(TimeSpan.FromTicks(start.TimeOfDay.Ticks))
: MonthOfYear.Of(start.Month, year)
.GetDayOfWeekDateForWeek(start.Week, start.DayOfWeek)
.Add(TimeSpan.FromTicks(start.TimeOfDay.Ticks));
DateTime endDate;
if (end.IsFixedDateRule)
{
if (end.Day == 1 && end.Month == 1 && end.TimeOfDay == DateTime.MinValue)
{
endDate = DateTime.MaxValue; // never end
}
else
{
endDate = Dates.Of(year, Month.Of(end.Month), end.Day).Add(TimeSpan.FromTicks(end.TimeOfDay.Ticks));
}
}
else
{
endDate = MonthOfYear.Of(end.Month, year)
.GetDayOfWeekDateForWeek(end.Week, end.DayOfWeek)
.Add(TimeSpan.FromTicks(end.TimeOfDay.Ticks));
}
return(new DaylightTime(startDate, endDate, adjustRule.DaylightDelta));
}
