Where is documentation on how to write an Ubuntu MATE panel applet?

Looking to acquire an applet for Jammy Jellyfish installation here, to calculate based off NIST time server's reported time now worked into the system time reported by the standard time applet from search engine results elsewhere, the local apparent solar time (sundial time), using this algorithm set-up: Convert UTC to Solar Apparent Time - File Exchange - MATLAB Central

Hi, @canandlamp .

The "closest" to documentation on how to write an Ubuntu MATE panel applet that I've found, so far, is the following topic here in the Ubuntu MATE Community, started by @anon94368460 on June 2019, where he explains how he created an applet to change the desktop settings for GTK 3 panel:

In that same topic, @vkareh (Victor Kareh - a MATE Developer) praised @anon94368460's post and added a few tips:

I hope this helps :slight_smile:

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