There's nothing preventing the users from entering times/dates in local times. Convert the entered times/dates to UTC (or, possibly to a "raw" time value), perform your logic, then convert back to local time.

I think that Date::Calc] will be very helpful to you.

In reply to Re^3: Is there an official DST border day detection module? by RonW
in thread Is there an official DST border day detection module? by flowdy

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