Timestamp and UTC offset for in the future *Goal*: Store date *exactly* 4 months in the future Store: ~timestamp~ and ~UTC offset~ (%UTC-4%) Current date/time: Jun 1st, 13:00 UTC-4 (%1338570000%) Future date/time: Oct 1st, 13:00 UTC-4 (%1349110800%) Correct for Montreal, where DST is still in effect. Wrong for Santiago, where it DST has kicked in so it's UTC-3. *Conclusion*: By storing ~timestamp~ and ~UTC offset~ you can't convert back to local time