970
xkcd #2846: Daylight Saving Choice
(imgs.xkcd.com)
Alt text:
I average out the spring and fall changes and just set my clocks 39 minutes ahead year-round.
Some cultures do/did count to 12 on their fingers using their thumb as a pointer and counting the spaces between their knuckles. https://en.m.wikipedia.org/wiki/Duodecimal#Origin