Try this (in the regex...):
$time =~ /^(\d{1,2}):(\d\d)\s?([APM]{2})$/
#----------------------------^ Added this
# And actually, now that I come to think of it, the
# dealing with AM or PM problems may be better sorted using:
$time =~ /^(\d{1,2}):(\d\d)\s?(AM|PM)$/
Note that you ought to use this regex after the user submits the data and before you enter it, so that if a user gives something bogus, you catch it then, before the data goes in, as opposed to afterwards during the sort.
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Dr. Michael K. Neylon - mneylon-pm@masemware.com
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"You've left the lens cap of your mind on again, Pinky" - The Brain