System.timers unable to set multiple "OnCalendar" fields

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1

error: attribute 'OnCalendar' already defined during rebuild.

According to this link: “May be specified more than once, in which case the timer unit will trigger whenever any of the specified expressions elapse.”

2

Setting an attribute multiple times with the NixOS module requires using a list:

systemd.timers.something.OnCalendar = [
  "monthly"
  "daily"
];

NixOS won’t let you write to a single-value attribute multiple times, because that’s ambiguous. So the systemd module needed to use lists to allow you to write multiple attributes, because systemd does permit that.

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