> But I do agree with leap seconds: it's absolute trivia, not a useful thing for a programmer to know. Maybe, all I know is that it was relevant for me during

> But I do agree with leap seconds: it's absolute trivia, not a useful thing for a programmer to know. Maybe, all I know is that it was relevant for me during the first years in industry. If you work with timeseries which comes from source systems you don't 100% controll, like in many industrial settings, its important to know about them, and how they are handled upstream. Do the source do smearing, or does it just sync every X hours? Does it sync with NTP, which will smear (slew) the change, or have they implemented their own thing? Do they just run `ntpd -q` regularly? But yeah, as I type it out I realize that most programmers probably don't work in that domain:-p