private static int GetDaysToSubstract(DateTime date, WeekCalendarType weekCalendarType)
{
if (weekCalendarType == WeekCalendarType.MondayFirst && date.DayOfWeek == DayOfWeek.Sunday)
{
return((TotalWeekDays - 1) * (-1));
}
else
{
return(MinWeekDays - (int)date.DayOfWeek + (int)weekCalendarType);
}
}
private static int GetDaysToAdd(DateTime date, WeekCalendarType weekCalendarType)
{
if (weekCalendarType == WeekCalendarType.MondayFirst && date.DayOfWeek == DayOfWeek.Sunday)
{
return(0);
}
else
{
return(TotalWeekDays - (int)date.DayOfWeek + (int)weekCalendarType);
}
}
/// <summary>
/// Retrives the last day of the week based on the week of a given date
/// </summary>
/// <param name="date">Given date to extract the last day of the week</param>
/// <param name="weekCalendarType">Calendar type, by default Starting on Monday</param>
/// <returns>Last day of the week given by the specified date</returns>
public static DateTime GetLastWeekDate(this DateTime date, WeekCalendarType weekCalendarType = WeekCalendarType.MondayFirst)
{
int dayToSubstract = GetDaysToAdd(date, weekCalendarType);
return(date.AddDays(dayToSubstract));
}