Time-zone conversion is not a trivial problem. If the from/to timezones are constant and you don't have any foolishness like "daylight savings time" to consider you could theoretically do a conversion by adding or subtracting n hours. However, what if that rolls over a day boundary? What about month boundaries? You have to consider years too. You also need to keep track of leap-years to be accurate. By the time you're done you've impelmented a good portion of a full calendar system just to do a timezone conversion. IMHO, much better to use a module.

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