While date_default_timezone_set looks tempting, I can't see how it would work with the values of the select menu, which will be '0, +1, +2... -2, -1' etc. Unless those values would work with the $timezone_identifier, but I see no mention of that in the manual. I think I may just go with strtotime()

Unless anyone has any follow up's to my query, thanks for the help Wild Honey.

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Not quite a n00b...