Make GNOME Calendar, Clock Icons Show Actual Date and Time
Well, a brand new GNOME extension allows them to EXACTLY that!
It’s called ‘Dynamic Calendar and Clocks Icons’ (sic) and adds dynamic, updating app icons for the GNOME Calendar and the GNOME Clocks apps. The Calendar app icons updates daily to reflect the day, month, and date, while the Clocks icons convey’s the current time through an easy-to-read analog face.
This extension works with both any icons set, including Ubuntu’s Yaru icon set. While the ‘dynamic’ icons are NOT the same as the icons they replace, they don’t look that out of place with Yaru of the Adwaita icon set. Against more stylised icon packs I imagine they’ll look more conspicuous.