Formula to calculate time difference from dd:mm:yy hh:min:sec

Start Time: 2010-09-20 12:37:59,820
End Time: 2010-09-20 12:38:00,804

The above time is in year-mon-day hh:min:sec, milliseconds

I have all those in individual variables

$1 represents 2010 $2 represents 09 $3 represent 20 and so on and so forth until $7

What is the formula to calculate the time difference?
srikanthradAsked:
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srikanthradAuthor Commented:
That is a 24 hour clock, by the way.
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Daniel JungesCommented:
would you like to calculate the diff in Excell or in an programming language ?
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srikanthradAuthor Commented:
I need a Math Formula so I can calculate the diff in shell script.
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