Is there a way to schedule a workflow to run on the LAST DAY of each month? It seems that I can only select every 28th of the month because of Feb. NS throws an error if I select 29th onwards. I know I can send emails on the first day of the month (wee hours) but trying to stick to our convention.

not sure with workflows, but when I've had this requirement with a saved search email schedule, I had the schedule run daily, with a criteria that only allowed results on the last day of the month

If I'm not mistaken the documentation says that it will always run on the last day if you set schedule from 31th of some month which has 31 day, like March.

Thank you both. I'll look into that.