Add timer exception

[Andy Pieters <systemd@xxxxxxxxxxxxxxxxx>]

Dear Systemd list

I have got a job that I want to execute every other day.

The job is rather lengthy and takes more than 24 hours to complete but
less than 48.

So here are my criteria:

Start today
Start the day after tomorrow (t+2d)*1
Start the (t+2d)*2
Start 2 days after that (t+2d)*n


My timer unit:

[Timer]
OnCalendar=*-*-01,03,05,07,09,11,13,15,17,19,21,23,25,27,29,31 03:30:00

The problem with that is when I simulate the execution dates,
specifically at newyear:

Tue 2018-12-25 03:30:00 CET
Thu 2018-12-27 03:30:00 CET
Sat 2018-12-29 03:30:00 CET
    Mon 2018-12-31 03:30:00 CET
    Tue 2019-01-01 03:30:00 CET
Thu 2019-01-03 03:30:00 CET
Sat 2019-01-05 03:30:00 CET
Mon 2019-01-07 03:30:00 CET
Wed 2019-01-09 03:30:00 CET

We can see that the timer would be triggered two days in a row.

What can we do about this, please? Is there a better way to define a
timer to run every other day? Can we perhaps add an exception for a
specific date?

Thank you kindly

Keep up the good work!



Andy
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