private static DateTime?ConvertDateTimeToFromUtcForTimeZone(DateTime dt, ConversionDirections cd, TimeZoneInfo tzi)
{
if (tzi == TimeZoneInfo.Utc)
{
return(dt);
}
switch (cd)
{
case ConversionDirections.To:
return(TimeZoneInfo.ConvertTimeToUtc(dt, tzi));
case ConversionDirections.From:
return(TimeZoneInfo.ConvertTimeFromUtc(dt, tzi));
default:
return(null);
}
}
internal static ScheduleRepeatDaysOfWeekFlags ConvertRepeatDaysOfWeekForTimeZone(Schedule schedule, ConversionDirections toFromUtc, TimeZoneInfo tzi)
{
if (!schedule.ActivateDateTime.HasValue)
{
throw new ArgumentNullException("schdeule", "The schedule passed does not have a value for the ActivateDateTime property");
}
var retValue = schedule.RepeatDaysOfWeek;
var convertedActivateDateTime = TimeZoneInfo.ConvertTimeFromUtc(schedule.ActivateDateTime.Value, tzi);
if (convertedActivateDateTime.Day != schedule.ActivateDateTime.Value.Day)
{
var original = (int)schedule.RepeatDaysOfWeek;
TimeSpan ts = toFromUtc == ConversionDirections.To
? convertedActivateDateTime - schedule.ActivateDateTime.Value
: schedule.ActivateDateTime.Value - convertedActivateDateTime;
//always shift by a minimum of 1 day
var shiftDaysNum = Convert.ToByte(Math.Abs(Math.Round(ts.TotalDays)) + 1);
int convertedRepeatDaysOfWeekFlagsValue = 0;
if (ts.TotalDays > 0)
{
// rotate the day flags to the right by x bit(s)
convertedRepeatDaysOfWeekFlagsValue = original.RotateRight(7, shiftDaysNum);
}
if (ts.TotalDays < 0)
{
// rotate the day flags to the left by x bit(s)
convertedRepeatDaysOfWeekFlagsValue = original.RotateLeft(7, shiftDaysNum);
}
retValue = (ScheduleRepeatDaysOfWeekFlags)convertedRepeatDaysOfWeekFlagsValue;
}
return(retValue);
}