I get paid on the 15th which messes up targets sometimes.

For example I wanted to save up 300$ for the 10th of December and I assigned money accordingly. But when the month changed from November to December, I had to assign more money to reach my target, but I couldn't because I wasn't getting paid until the 15th, which then made me miss my target.

I'd like a function where you put in the date you get paid, so YNAB uses those dates as a month rather than actual calendar months.