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So many Zen Cart's admin pages are using SpiffyCalendar!
https://i.imgur.com/Qq8TLqZ.png

Sadly, that's not really good calendar to be use anymore.

But, does not Zen Cart already implement...

Like carlwhat mentioned, I do think using the datepicker from jQuery UI would be better choice at this point.
As this bug is NOT only in your plugin... it affected literary any plugins that use the...