I bet KB's got it. Most inexpensive digital clocks use the line frequency for timing, very few use an internal oscillator. Somehow you have it set for 50Hz.
That would be hilarious. A whole shipment of 50Hz clocks, unloaded on TV to unsuspecting Americans at GREAT prices!but this has been multiple clocks. Unless the OP recently moved to the states from an area that used 50hz and brought a bunch of clocks with him or he got a really good deal on clocks on a late night tv informercial, I would doubt it was the 50hz/60hz issue.
I thought, "wow! I'm actually going to get an answer to this 15-year old mystery? Wow!"i have no idea, that's messed up though. only thing i can think of is ghosts.
Nothing else on circuit; but I hadn't researched how the clocks 'time' themselves. Interesting tip.I don't recall if AC powered digital clocks use the AC frequency to time themselves (60 hz = 1 second). But they must...Is there anything else on that particular circuit? Cfl's, old fluorescent shop lights (anything with an older ballast), electronics, etc? I know a clock run on modified sine wave (eg from a cheap dc-ac inverter) will make clicks run double-time. Kinda curious on this one...
as to being children; attitude is everything in life. If I acted my age I might be accused of being one of the ghosts messing with your clocks.I am not adverse to the space-time continuum theory as I've been ... well, kinda new-agey since Mother 'graduated'.