static extern uint GetTimeZoneInformation(out TIME_ZONE_INFORMATION

/// The GetTimeZoneInformation function retrieves the current time-zone parameters.

private static extern int GetTimeZoneInformation(out TimeZoneInformation lpTimeZoneInformation);

  /// Pointer to a null-terminated string associated with standard time. For example, "EST" could indicate Eastern Standard Time. The string will be returned unchanged by the GetTimeZoneInformation function. This string can be empty.

  /// Pointer to a null-terminated string associated with daylight saving time. For example, "PDT" could indicate Pacific Daylight Time. The string will be returned unchanged by the GetTimeZoneInformation function. This string can be empty.

  int currentTimeZone = GetTimeZoneInformation(out tzi);

        /// The GetTimeZoneInformation function retrieves the current time-zone parameters.

        private static extern int GetTimeZoneInformation(out TimeZoneInformation lpTimeZoneInformation);

            int currentTimeZone = GetTimeZoneInformation(out tzi);

        /// Pointer to a null-terminated string associated with standard time. For example, "EST" could indicate Eastern Standard Time. The string will be returned unchanged by the GetTimeZoneInformation function. This string can be empty.

        /// Pointer to a null-terminated string associated with daylight saving time. For example, "PDT" could indicate Pacific Daylight Time. The string will be returned unchanged by the GetTimeZoneInformation function. This string can be empty.