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Remove files older than 5 days in UNIX (date in file name, not timestamp)

I want to delete log files which are older than 5 days from a directory. But deletion should not be based on the timestamp of file. It should be based on the name of file. For Example todays date is 07/05/2012 and the directory contains 10 files of names like ABC_20120430.log, ABC_20120429.log, ABC_20120502.log, ABC_20120320.log etc. I want to be able to remove the files by extracting the date from the name of the file.