private bool IsRecurringOnDay(DateTime currentDay, DateTime rangeStart, DateTime rangeEnd, Appointment rootAppointment)
{
TimeSpan duration = rootAppointment.EndTime.Subtract(rootAppointment.StartTime);
DateTime startTime = rootAppointment.GetValidDateTime(new DateTime(currentDay.Year, currentDay.Month, currentDay.Day, rootAppointment.StartTime.Hour, rootAppointment.StartTime.Minute, 0));
DateTime endTime = rootAppointment.GetValidDateTime(startTime.Add(duration));
DateTime localStartTime = rootAppointment.GetLocalDateTime(rootAppointment.GetUTCDateTime(startTime));
DateTime localEndTime = rootAppointment.GetLocalDateTime(rootAppointment.GetUTCDateTime(endTime));
// If time-zone is not used return false
if (startTime == localStartTime) return currentDay >= rangeStart;
return DateTimeHelper.TimePeriodsOverlap(localStartTime, localEndTime, rangeStart, rangeEnd);
}
