/// <summary>
/// Update `BeginningTime` accroding to `RecurringFrequency`.
/// </summary>
/// <returns>Boolean value indicating whether `BeginningTime` is up to date or not.</returns>
public virtual bool UpdateBeginningTime()
{
if (RecurringFrequency == RecurringFrequencies.None)
{
return(false);
}
if (BeginningTime > DateTime.Now)
{
return(true); // BeginningTime is up-to-date.
}
// assume that `dt` is today, check whether it has been expired or not. (if it is expired: starts from next day)
DateTime beginningDateTime = BeginningTime.AddDays((DateTime.Today.Date - BeginningTime.Date).Days);
// Compare time part of the day only
DayOfWeek targetWeekday = (BeginningTime.TimeOfDay <= DateTime.Now.TimeOfDay) ? DateTime.Now.DayOfWeek + 1 : DateTime.Now.DayOfWeek;
Weekday nextRecurringWeekday = Utils.GetNextRecurringWeekday(targetWeekday, RecurringFrequency);
if (nextRecurringWeekday.ToSystemWeekday() == DateTime.Today.DayOfWeek)
{
BeginningTime = DateTime.Today.Date.Add(BeginningTime.TimeOfDay);
}
else
{
BeginningTime = Utils.DateTimeOfNextWeekday(beginningDateTime, nextRecurringWeekday.ToSystemWeekday());
}
return(true);
}