bash script - when was folder last modified?

Hi,

I am writing a backup script for my VPS.

At the beginning of the script I need to check if "/backup/cpbackup/monthly" has been modified in the last 24 hours. If yes then do something.

This line

find /backup/cpbackup/monthly/ -exec stat \{} --printf="%y\n" \; | sort -n -r | head -1

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returns

2013-02-17 11:01:53.976116935 +1100

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How do I get that date into a variable and then see if its < 24 hours old?

Thankyou