I have found solution that was a little tricky to figure out but I am guessing it the only way correct?
So set to custom then make it end that month and then set day to the day I want so 6th.
An event every 1 month(s) on day 6 that lasts 0 day(s) and 9.99 hour(s), the last of which will begin on 2016-02-29