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This is an excerpt from the latest version perlfaq4.pod, which
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4.14: How can I compare two dates and find the difference?

(contributed by brian d foy)

You could just store all your dates as a number and then subtract. Life
isn't always that simple though. If you want to work with formatted
dates, the "Date::Manip", "Date::Calc", or "DateTime" modules can help
you.



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