[Feature Request] Customizable command execution when clicking on the datetime plugin

Submitted by Uwe

Assigned to Florian Rivoal

Link to original bug (#14558)

Description

I think it would be great if one could customize a command which should be executed when clicking on the datetime plugin.

The reason is that I have a standalone calendar program (tkremind) installed, which I would like to open when clicking on the datetime plugin instead seeing the calendar from the plugin itself.

I can imagine that other users might like this option, too.