Worth emphasizing that decimal time is not just historical curiosity and fringe idea, especially the astronomical community uses decimal time fairly regularly, various "julian date" systems attest that. https://en.wikipedia.org/wiki/Julian_day
Which was interesting, until you also realized, they expected you to clock in precisely at the start of your shift, giving you a 36 second window to do it in.
On the first day I was wondering why there were so many time clocks for the size of the office and then I witnessed the shift change "stampede" that this policy incidentally created.
To answer the other question at the same time, in the 90s, was most shops that used an analog time clock would only advance the stamped time every 5 minutes. So, if you clocked in at 8:04, it would still punch 8:00 on your card. So, it was notable to me at the time that they had clocks with a finer grain of accuracy that fed into their computers immediately, and they actually cared about the "slop" involved in time keeping.