My favourite one of this kind is the Rockchip RK808 RTC, where the engineers thought that November had 31 days, needing a Linux kernel patch to this day that translates between Gregorian and Rockchip calendars (which are gradually diverging over time).

Also one of my favourite kernel patch messages: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/lin...

It's always November, isn't it? I've once made a log collection system that had a map of month names to months (had to create it because Go date package didn't support that specific abbreviation for month names).

As you might've guessed, it lacked November, but no one noticed for 4+ months, and I've left the company since. It created a local meme #nolognovember and even got to the public (it was in Russia: https://pikabu.ru/story/no_log_november_10441606)

That one is up there with the all time greats.

That's gold.

That hardware real time clocks keep time in date and time drives me batty. And no one does the right thing which is just a 64 bit counter counting 32khz ticks. Then use canned tested code to convert that to butt scratching monkey time.

Story my old boss designed an STD Bus RTC card in 1978 or something. Kept time in YY:MM:DD HH:MM:SS 1/60 sec. And was battery backed. With shadow registers that latched the time. Couple of years later redesigned it as a 32 bit seconds counter. With a 32khz sub seconds counter. Plus a 48 bit offset register. What was a whole card was now a couple of 4000 series IC's on the processor card. He wrote 400 bytes of Z80 assembly to convert that to date and time. He said was tricky to get right but once done was done.

> Rockchip calendars

>.< haha i remember this