La prochaine date/heure à laquelle une heure avancée de la transition se produit

Hello_. Il pourrait être trop tard mais je vais poster ici le code que j'ai utilisé pour ce but. Cela est peut-être sûr que quelqu'un est temps de la mettre en œuvre. Je l'ai fait en fait avec l'aide de ce lien est @Jamiegs réponse.

    public static DateTime? GetNextTransition(DateTime asOfTime, TimeZoneInfo timeZone)
{
TimeZoneInfo.AdjustmentRule[] adjustments = timeZone.GetAdjustmentRules();
if (adjustments.Length == 0)
{
//if no adjustment then no transition date exists
return null;
}
int year = asOfTime.Year;
TimeZoneInfo.AdjustmentRule adjustment = null;
foreach (TimeZoneInfo.AdjustmentRule adj in adjustments)
{
//Determine if this adjustment rule covers year desired
if (adj.DateStart.Year <= year && adj.DateEnd.Year >= year)
{
adjustment = adj;
break;
}
}
if (adjustment == null)
{
//no adjustment found so no transition date exists in the range
return null;
}
DateTime dtAdjustmentStart = GetAdjustmentDate(adjustment.DaylightTransitionStart, year);
DateTime dtAdjustmentEnd = GetAdjustmentDate(adjustment.DaylightTransitionEnd, year);
if (dtAdjustmentStart >= asOfTime)
{
//if adjusment start date is greater than asOfTime date then this should be the next transition date
return dtAdjustmentStart;
}
else if (dtAdjustmentEnd >= asOfTime)
{
//otherwise adjustment end date should be the next transition date
return dtAdjustmentEnd;
}
else
{
//then it should be the next year's DaylightTransitionStart
year++;
foreach (TimeZoneInfo.AdjustmentRule adj in adjustments)
{
//Determine if this adjustment rule covers year desired
if (adj.DateStart.Year <= year && adj.DateEnd.Year >= year)
{
adjustment = adj;
break;
}
}
dtAdjustmentStart = GetAdjustmentDate(adjustment.DaylightTransitionStart, year);
return dtAdjustmentStart;
}
}
public static DateTime GetAdjustmentDate(TimeZoneInfo.TransitionTime transitionTime, int year)
{
if (transitionTime.IsFixedDateRule)
{
return new DateTime(year, transitionTime.Month, transitionTime.Day);
}
else
{
//For non-fixed date rules, get local calendar
Calendar cal = CultureInfo.CurrentCulture.Calendar;
//Get first day of week for transition
//For example, the 3rd week starts no earlier than the 15th of the month
int startOfWeek = transitionTime.Week * 7 - 6;
//What day of the week does the month start on?
int firstDayOfWeek = (int)cal.GetDayOfWeek(new DateTime(year, transitionTime.Month, 1));
//Determine how much start date has to be adjusted
int transitionDay;
int changeDayOfWeek = (int)transitionTime.DayOfWeek;
if (firstDayOfWeek <= changeDayOfWeek)
transitionDay = startOfWeek + (changeDayOfWeek - firstDayOfWeek);
else
transitionDay = startOfWeek + (7 - firstDayOfWeek + changeDayOfWeek);
//Adjust for months with no fifth week
if (transitionDay > cal.GetDaysInMonth(year, transitionTime.Month))
transitionDay -= 7;
return new DateTime(year, transitionTime.Month, transitionDay, transitionTime.TimeOfDay.Hour, transitionTime.TimeOfDay.Minute, transitionTime.TimeOfDay.Second);
}
}

Exemple d'utilisation ressemblera à ceci:

//This should give you DateTime object for date 26 March 2017 
//because this date is first transition date after 1 January 2017 for Central Europe Standard Time zone
DateTime nextTransitionDate = GetNextTransition(new DateTime(2017, 1, 1), TimeZoneInfo.FindSystemTimeZoneById("Central Europe Standard Time"))

Vous pouvez trouver le code que j'ai joué avec ici.

OriginalL'auteur codtex