Well 1, 2, 3, take my hand and come with me
Because you look so fine
And I really wanna make you mine
Or we could just name them after regular people. Stevesday, Bobsday, Jennifersday...
The hours and minutes are based on a Babylonian base 60 system, while the day cycle is (as far as I remember) Egyptian, where they'd count the rise of certain stars at certain intervals and thereby set the cycle from one rise to the next the following day.
The French tried to switch to metric, or decimal, time shortly after the revolution in the late 1700's but it never really caught on and was done away with after a decade or so.