A System.Globalization.DaylightTime object that contains the start and end date for daylight saving time in year.
Only one daylight saving time period per year is supported.
If daylight saving time is not used in the current time zone, the return value is a System.Globalization.DaylightTime object, where the value of System.Globalization.DaylightTime.Start and System.Globalization.DaylightTime.End is DateTime.MinValue, and the value of System.Globalization.DaylightTime.Delta is a TimeSpan initialized to 0 ticks.