Time zone support has recently been added to qore in svn; version 0.8.0 will support time zones. Qore uses the system's zoneinfo database (if it can find it) to load in information about daylight savings time and time zone names, etc.
The entire date/time implementation was internally reimplemented for this change, although the old APIs remain for backwards-compatibility. Basically now all absolute date/time values not having an explicit time zone identifier will be assumed to be local time.
During the change I also extended the precision of relative and absolute date/time values to the microsecond (1,000,000th of a second), previously it was only to the millisecond.