You can create your own Date/Time manipulation module, and overload the >, <, =, >=, !=, <= functions, if you want to work with dates in an OO way, so you could do something like:

 
if ( $timestamp1 > $timestamp2 )

..or..

if ($timestamp1 == $timestamp2 )

..and so on..
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I've something like that implemented at work, using Date::Calc as backend of our date manipulation module, Date::Calc its flexible and fast.