When a daylight savings change occured recently, all my DAB radios failed to update. An alarm clock would have been off by 1 hour. This is apparently because DAB radios only listen to the time signals that come from radio signals they are tuned into, thus only when playing.

All my humidistats and thermometers all had the correct time because they are always listening to time broadcasts.

My smartphones and PCs always have sufficiently correct time despite being offline because they have a locality configuration which implies when daylight savings is expected.

I think all my household DAB radios have alarm functionality, so it’s perhaps a widespread bug. Shouldn’t the radio software be able to detect the locality from the radio signals, and then use that to schedule time changes? Or short of that, it should be able to silently listen to a DAB signal from 1am to 1:15 am to set the clock from the signal.

Imagine as well that when the alarm triggers and DAB plays, the clock is then updated. So you get alarmed at the wrong time but imagine the confusion when the clock gets corrected before you look at it.

I also wonder what a disaster it must be when a DAB signal becomes too weak to make sound. Then what? Does the alarm clock try to wake us up with silence? Is this another case where FM is superior, or are any DAB radios smart enough to switch to a preprogrammed sound when there is no DAB signal?