With the beginning of the new year, I received meeting invitations for a twice weekly meeting, on Mondays and Thursdays. I added this to my Org agenda file, and used a diary-style expression. I thought I could use diary-float for every Monday and another for every Thursday, like this

* Recurring meeting
<%%(diary-float t 1 0) 11:30-12:00>
<%%(diary-float t 4 0) 11:30-12:00>

But when I looked my agenda, I didn’t see anything for Mondays or Thursdays at 11:30-12:00. Hmm.

The help for diary-float only specifies how the third argument, N, applies if it is positive or negative. It would be nice if 0, or some other value like t, meant every week.

I eventually settled on

* Recurring meeting
<%%(diary-cyclic 7 1 5 2026) 11:30-12:00>
<%%(diary-cyclic 7 1 8 2026) 11:30-12:00>

for the meeting. It works, but it wasn’t obvious to me that this was the way to go.

I could also have put 5 entries for Mondays and 5 for Thursdays, to get all five possible occurences of each in a month. Seems kind of weird, so I didn’t.

And finally, I could just use a regular +1w repeater, but then I need to have two separate TODOs in my agenda file, one for Mondays and one for Thursdays.