/// <summary>
/// Returns an enumeration over system TimeZones with the given filter conditions.
/// </summary>
/// <param name="zoneType">The system time zone type.</param>
/// <param name="region">The ISO 3166 two-letter country code or UN M.49 three-digit area code. When NULL, no filtering done by region.</param>
/// <param name="zoneOffset">An offset from GMT in milliseconds, ignoring the effect of daylight savings time, if any. When NULL, no filtering done by zone offset.</param>
public static IEnumerable <TimeZone> GetTimeZones(USystemTimeZoneType zoneType, string region, int zoneOffset)
{
return(CreateTimeZoneList(() =>
{
var en = NativeMethods.ucal_openTimeZoneIDEnumeration(zoneType, region, ref zoneOffset, out ErrorCode errorCode);
return new Tuple <SafeEnumeratorHandle, ErrorCode>(en, errorCode);
}));
}
