Or without modules:
($sec,$min,$hour,$mday,$mon,$year,$wday,$yday,$isdst) = localtime(time
+);  
$year += 1900;
$mon += 1;
print join '_', ($year,$mon,$mday,$hour,$min,$sec);  # YYYY_MM_DD_HH_M
+M_SS

[download]
Comment: It does not print values less than 10 with a leading zero. If you need that, it can be easily added. It is left as an exercise for the reader.

Update: Added $mon += 1. Thanks graff

CountZero

"If you have four groups working on a compiler, you'll get a 4-pass compiler." - Conway's Law

In reply to Re: Date conversion by CountZero
in thread Date conversion by sonic

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