You should check out POSIX::strftime, too. :)

use POSIX qw(strftime);

print "mm/dd/yyyy:\t".    strftime('%d/%m/%Y', localtime time) . $/;
print "yyyymmdd_hhmm:\t". strftime('%Y%m%d_%H%M', localtime time) . $/
+;
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These also have the benefit of zero-padding the date and time components, so they will sort correctly if used in a filename (for example).