FAQ 4.14 How can I compare two dates and find the difference?

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4.14: How can I compare two dates and find the difference?

    If you're storing your dates as epoch seconds then simply subtract one
    from the other. If you've got a structured date (distinct year, day,
    month, hour, minute, seconds values), then for reasons of accessibility,
    simplicity, and efficiency, merely use either timelocal or timegm (from
    the Time::Local module in the standard distribution) to reduce
    structured dates to epoch seconds. However, if you don't know the
    precise format of your dates, then you should probably use either of the
    Date::Manip and Date::Calc modules from CPAN before you go hacking up
    your own parsing routine to handle arbitrary date formats.


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