this post was submitted on 24 May 2025
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12 hour time is an inferior standard, and we should be on 24 hour time so developers don't ever default to 12 hour time. Way too many instances of mission critical things getting swapped on am/pm by mistake. That is never a problem with 24h time.
Iโve been trying to move over to 24 hour time. I swear switching from Fahrenheit to Celsius was easier.
I used math tricks at first. But honestly, just switching even one clock like your watch or phone makes it pretty easy over time.
1pm is easy to remember as it's 13, a prime number
7x2 = 14(00)
3x5= 15(00)
4x4 =16(00)
5pm is 17, also a prime.
6x3 = 18(00)
7pm is also a prime, 19(00).
20, 21, 22, 23, and 00 also have math tricks, but you can also just remember that after 8pm, you have less than four hours till midnight :)
I find it easier to just add/subtract 12, the problem is that I sometimes accidentally add/subtract 10.
Yeah, I knew about that trick, but for me, it was easier to just break down 16 into its smaller components. Or remember that 19 was a prime, which belonged to 7. After a bit of time (heh), it all just started to meld for me. Nothing like immersion-based learning!