Sometimes complexity is fractal in interesting ways, and other times it is honestly kind of boring.
We've long offered the ability to tether your RSS-to-email send to the first of the month, or the first (say) Wednesday of the month, or of course the last day of the month.
But we neglected to offer the ability to send on, say, the 29th, for the simple reason of laziness. I figured the effort of explaining and documenting what should happen when the 29th of a given month doesn't exist outweighed the theoretical return.
The way such an assumption gets invalidated is by enough people telling me that they want such a thing. So here I am. I sat down and dealt with some calendar logic to bring you the ability to send on any arbitrary day of the month.
Note that, as part of this, we technically "unshipped" the ability to choose the first or last day of the month. If that's what you want, just choose the 1st or the 31st and we'll do the right thing — and for any day a given month doesn't have (the 29th of a short February, the 31st of April), we quietly fall back to that month's last day.
Head to your feed's cadence settings to pick your day. As always, let us know if you run into any snags.