Example:

Bucket Duration : 600 sec (10 min)

Input:
S_TIME	                CountOfMsg
5/19/2008 6:12:44 PM	4
5/19/2008 6:17:44 PM	4
5/19/2008 6:22:44 PM	4
5/19/2008 6:27:44 PM	4
5/19/2008 6:32:44 PM	4

Output: 
Interval Bucket	        CountOfMsg
5/19/2008 6:12:00 PM	8
5/19/2008 6:22:00 PM	8
5/19/2008 6:32:00 PM	4

I am having problems when I enter the time (in the current format) into a perl hash to compare if its < or > the interval.