}
- public static DateTimeOffset ConvertTime (DateTimeOffset dateTimeOffset, TimeZoneInfo destinationTimeZone)
+ public static DateTimeOffset ConvertTime(DateTimeOffset dateTimeOffset, TimeZoneInfo destinationTimeZone)
{
- throw new NotImplementedException ();
+ if (destinationTimeZone == null)
+ throw new ArgumentNullException("destinationTimeZone");
+
+ var utcDateTime = dateTimeOffset.UtcDateTime;
+ AdjustmentRule rule = GetApplicableRule (utcDateTime);
+
+ if (rule != null && destinationTimeZone.IsDaylightSavingTime(utcDateTime)) {
+ var offset = destinationTimeZone.BaseUtcOffset + rule.DaylightDelta;
+ return new DateTimeOffset(DateTime.SpecifyKind(utcDateTime, DateTimeKind.Unspecified) + offset, offset);
+ }
+ else {
+ return new DateTimeOffset(DateTime.SpecifyKind(utcDateTime, DateTimeKind.Unspecified) + destinationTimeZone.BaseUtcOffset, destinationTimeZone.BaseUtcOffset);
+ }
}
public static DateTime ConvertTimeBySystemTimeZoneId (DateTime dateTime, string destinationTimeZoneId)