If you wanted this to be absolutely correct for ANY two dates, there are plenty of complications to consider: not least of them being leap years and worldwide time zones.
I recently had to solve a similar problem and looked into various modules out there, and concluded that DateTime was the best one to use. May be worth you taking a look.
In reply to Re: Finding the difference between 2 dates in seconds
by oxone
in thread Finding the difference between 2 dates in seconds
by qsl
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