How can I edit the wingpanel calendar applet?

Question

I want to edit the wingpanel calendar applet to make it similar to Gnome calendar. I do not want to change the color, rather want to have some spaces between the days and make the current date selection to be round with blue color something like in the picture below:

Anyone knows how to do it? At least the file path to that applet.

Answer 1

This functionality is in the wingpanel-indicator-datetime package. If you want to change the widget, you can get the source package and edit the source (in src/Widgets/calendar).