I have two radio controlled clocks. One checks each night at 2 o'clock with the radio time, and then sees it is probably 0.1 second ahead. Apparently this analogue clock can only adjust time forward, so each night it has to do a 12 hour cycle (minus 0.1 second). This means 50% extra battery use. Plus it's annoying when you're up at that time. All is quiet and then you hear this strange squeeking sound.
The other clock is digital, so adjusting time is easier, except that it forgets to do this when changing to and from summertime. The only solution is to unplug the power cable. Why this clock doesn't know this is a mystery. It only has to check once a week. I don't know how this radio signal works, but can't they send info about winter- or summertime along with the time?
The reality is, at least in the Eastern US, that you probably don't successfully receive the signal often enough to ever get the DST bit. When I lived in Chicago, I used WWVB clocks and they worked fine, when I moved to New York, I never got them to sync. I also have a bunch of chips for receiving the signal and they have never worked. You have to use the new phase modulated signal, and nobody sells chips for receiving these. (Naturally the older AM receivers are a cheap single-chip solution. So would a receiver for the phase-modulated data, but nobody feels like making one, so you are stuck.)
The other clock is digital, so adjusting time is easier, except that it forgets to do this when changing to and from summertime. The only solution is to unplug the power cable. Why this clock doesn't know this is a mystery. It only has to check once a week. I don't know how this radio signal works, but can't they send info about winter- or summertime along with the time?