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+---
+tags:
+  - systemd
+---
+Managed similarly to a unit. So we can start/stop/enable them etc.
+
+List: `systemctl list-timers [--all]`
+
+**Realtime Timers**; same as cron. Use `OnCalendar`
+**Monotonic Timers**; Varying start point, then interval. E.g `OnBootSec` specifies start x seconds after boot.
+
+Each `foo.timer` has a `foo.service` which it calls. Service doesn't need install section. Timer can call different unit by `[Timer] Unit=`
+
+# Time span format
+usec, us, μs
+msec, ms
+seconds, second, sec, s
+minutes, minute, min, m
+hours, hour, hr, h
+days, day, d
+weeks, week, w
+months, month, M (defined as 30.44 days)
+years, year, y (defined as 365.25 days)
+
+# OnCalendar Format
+`DayOfWeek Year-Month-Day Hour:Minute:Second`
+
+```
+OnCalendar=Mon,Tue *-*-01..04 12:00:00
+OnCalendar=Sat *-*-1..7 18:00:00
+OnCalendar=*-*-* 4:00:00
+OnCalendar=Mon..Fri 22:30
+OnCalendar=Sat,Sun 20:00
+OnCalendar=*-*-* 02:00:00 Europe/Paris
+```
+
+
+
+
+
+
+---
+https://wiki.archlinux.org/title/Systemd/Timers
+https://man.archlinux.org/man/systemd.time.7
+https://man.archlinux.org/man/systemd.timer.5
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