My cat can almost definitely tell time within about 2 minuts. At least for a specific time of day. He gets canned food the same time every day, and will remind me I’ve yet to feed him at most 2 minuts after (unless he’s asleep). The only clocks I have in the house are digital, and none makes a sound. It takes him a few days to adjust moving to and form daylight savings time, and the change is gradual. He does this after changing apartments, so it’s not some noise form the outside. I have no explanation other than he can tell time.