Why not add some more date formats?
Why can't you just let me type 10th Jan or Jan 10th? Either variation is completely unambiguous so it is not like it would confuse anyone. Every time I try to enter a recurring event (which is just about all my items since I just started using the app) it ends up taking me 5 minutes to enter the date!
The user interface should try to be a little more liberal about what date formats and recurrence phrasings it accepts. There is also the possibility that it could "educate" me at the same time as I use it by showing the recurrence formulas in my recurring tasks in the list above when I start to add a task - this could avoid extra visual clutter during regular use but offer the information for reference when I need it because if I am adding a task to pay credit card B on the 25th of every month odds are I will end up using the same logic as I used to pay credit card A in the 12th of every month.