"broken clock is right twice a day" sucks. i hate this phrase. i want to design a better broken clock. when you shake it (sounds of loose gears and springs) it will tell you a random time that is not the current, correct time. it will be right no times a day. this ain't your grandpa's broken clock
"Even a broken clock is right twice a day, but that's no good to you unless you know when it's right; for that you're going to need another clock, so just use that one instead"
i think it would have to be. ideally it would fade in and out and therefore never have to tick over into a time that is today's actual time. physical minuites and seconds just leave you open to gotchas