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xkcd #2846: Daylight Saving Choice
(imgs.xkcd.com)
Alt text:
I average out the spring and fall changes and just set my clocks 39 minutes ahead year-round.
What if you don't want to ask for some specific reason? Time zones!
Checkmate!
Nope, that was a check! The reason of not wanting to ask for availability periods still exists with time zones.