How can I change the format of the panel clock in Ubuntu Mate 20.04?

The default format is XX:XX AM/PM

How can I change it to XX:XX AM/PM Weekday Month Date ?

Searching offers up dconf-editor solutions that don't apply to 20.04

Solution 1:

Clock indicator in Ubuntu MATE 20.04 LTS is controlled by indicator-datetime service, so to customize it, you have to use commands below:

gsettings set com.canonical.indicator.datetime time-format custom

gsettings set com.canonical.indicator.datetime custom-time-format '%l:%M %p %A %B %d'

it probably was doable in dconf-editor, you would have had to set the time-format to "custom" in order for your changes to show...