OffsetFromGMT
int OffsetFromGMT() const;
return fTimeZone->OffsetFromGMT();
int OffsetFromGMT() const;
_kern_set_timezone(timeZone.OffsetFromGMT(), timeZone.ID().String(),
? fCurrentZoneItem->OffsetFromGMT()
now -= timeZone.OffsetFromGMT() - currentOffset;
int32 timeZoneOffset = BTimeZone(timeZoneID.String()).OffsetFromGMT();