This has been the case on most smart phones I’ve owned. It’s an interesting little detail that’s easily missed.

I was a little sad to see that my icon pack foregoes this feature, but I can't see myself using a different one. Delta icons on F-Droid has so much coverage (10k+), are free, and they're so clean looking.

Plus I'm using Chrono as my default clock and alarms.

And calendar too!

It probably changes the date on the calendar icon every day too.

Hey! Mine does it too! I've never even noticed. This is neat. Thanks for sharing, OP!

Bruh I was super confused when I found that Ubuntu’s calender app doesn’t have its icon update