Imagine wondering “When’s the next time that Christmas will be a Tuesday/Wednesday, for those sweet optimal public holidays (Jan 1st being exactly a week later)?”
Now imagine asking, idk, google or Siri or god forbid an actual calendar, instead of turning to the best tool for the job: systemd.
@lambisio Yeah, well, I’m feeling conflicted bth. On the one hand, yes, systemd is eating everything.
On the other hand, this is for systemd-timers, and they are just so *nice*.
@lambisio @xahteiwi Not sure – I thought "* * 13 * 5" meant "both on Fridays and on the 13th of each month", and https://crontab.guru/#0_0_13_*_5 agrees.
In any case a huge advantage of systemd timers is your ability to query them for next / scheduled / past runs like this fwiw.
@rixx @xahteiwi That's weird. I mean, 30 6 * * * means "at 6:30" and not "every half hour and also at 6:00". So it'd be extra weird if dow/dom were specialcased that way.
But even then, that doesn't justify "solving" the problem by subsuming it into systemd. Pretty sure there's like at leats other 200 tools to do the job.
(No, NTP is *not* one of them!)
Somehow this feels so wrong, but… it works. XD
@rixx I love it.
But it's not feature complete until it supports all of remind(1) script.
or convince everyone to switch to a 13-month perennial calendar where 25 Dec is always Thursday AND 01 Jan is always Monday
@rixx This is systemd propaganda! /jk
This feel so wrong, like emojis source code (I love it!)
@schrotthaufen @catsalad Because systemd-timers are an actually really cool thing, but if you implement a scheduling system, you need to understand calendars, to allow people to say "do this every Monday".
(sorry, this is assuming you wanted an answer)
@rixx this doesn't work properly though:
rixx
Bill Hooker
Gadfly (-booq-)
Dragon-sided D
soc
nadja
Cysio 
leyrer
BenBE
Jak2k 🏳️🌈
don
Lucho, dando piña a la pizza
Florian Haas
Comrade elronxenu
Thomas Mayer
Amin Hollon 🏳
mirabilos
Christian Vogel
Fritz Adalis
Marcos Dione
scy
cerement
MegatronicThronBanks
Cat 🐈🥗 (D.Burch) 
me·ta·phil, der
schrotthaufen
Jann Hornjann@tigerlap:~/linux$ systemd-analyze calendar --base-time='2010-01-01' "*-*-* 23:59:60"
Failed to parse calendar specification '*-*-* 23:59:60': Invalid argument
@rixx Want to know why only Apple products are allowed in my house? This. This is why.
(Dear penguinheads, my killfile thirsts for your souls. If you reply I shall feed you to it.)
I actually demonstrated this a few classes ago. As a way to figure out the furthest out you can set a cron job. I think it was on a Wed 29 Feb.
All the LLMs gave a wrong answer.
Martin
srxl
Taneb
Gilgwath
Patrick Morris Miller
Bruce Elrick
John Timaeus
bruno
zetaReserve