This setting defines when daylight saving time begins and ends. It uses three properties: Start is the time when daylight saving time begins; End is when standard time resumes; and Delta is the length of time (measured in ticks ) that the clock is adjusted from standard time during this period. Delta is a System.TimeSpan value measured in "ticks," or 100-nanosecond periods. public class DaylightTime { // Public Constructors public DaylightTime (DateTime start , DateTime end , TimeSpan delta ); // Public Instance Properties public TimeSpan Delta {get; } public DateTime End {get; } public DateTime Start {get; } } Returned BySystem.TimeZone.GetDaylightChanges( ) Passed ToSystem.TimeZone.IsDaylightSavingTime( ) |