"...what you want to use for date math..."

Yes and no.

Despite my annoying mistake: I used Date::Calc until someone told me it's API is inferior and that the new kid on the block is much cooler.

So i crucify myself with the manpage.

And why should i use .45 if .22 does the job less expensive:

karls-mac-mini:monks karl$ perl -MPOSIX=strftime -E 'say  strftime("%Y
+:%m:%d %H:%M:%S%z", localtime() );'
2015:06:14 19:42:10+0200
[download]

Best regards, Karl