How to run systemd timer twice daily

In order to run a systemd timer twice daily at fixed times, use this syntax in the .timer file:

twice-daily.timer

OnCalendar=*-*-* 00,12:00:00

OnCalendar=*-*-* 00,12:00:00

This line means: Run the service on each and every day (*-*-*) at 00:00:00 and 12:00:00 (00,12:00:00)

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