http://www.perlmonks.org?node_id=1033496


in reply to Difference between two dates in years

Try Date::Manip. 

use Date::Manip; 
$dyear = Delta_Format(DateCalc('1925-12-22 00:00UTC', '2012-03-22 00:0
+0UTC'), '%yys');
# $dyear is now 86.249, the difference between the two dates in years

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