namespace System { public abstract class TimeZone { public static TimeZone CurrentTimeZone { get; } public abstract string DaylightName { get; } public abstract string StandardName { get; } protected TimeZone(); public abstract DaylightTime GetDaylightChanges(int year); public abstract TimeSpan GetUtcOffset(DateTime time); public virtual bool IsDaylightSavingTime(DateTime time); public static bool IsDaylightSavingTime(DateTime time, DaylightTime daylightTimes); public virtual DateTime ToLocalTime(DateTime time); public virtual DateTime ToUniversalTime(DateTime time); } }