in reply to How do I know if a package is on my server?

You can also do it this way and let Perl tell you the current version (Note the use of double quotes, required for Windows): 
perl -e "use DateTime 99999"
DateTime version 99999 required--this is only version 1.42 at -e line 
+1, <DATA> line 1.

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"It's not how hard you work, it's how much you get done."

In Section Seekers of Perl Wisdom