zeigt den letzten Tag eines Monates an

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/// <summary>
/// Get last day of month
/// </summary>
/// <param name="date">any date in desired month</param>
/// <returns>last day of month</returns>
public DateTime LastDayOfMonth(DateTime date)
{
     DateTime NewDate = date.AddMonths(1);
     return NewDate.AddDays(NewDate.Day * -1);
}