Some people may not know the difference between an even, and an odd day. I will hopefully be able to answer that here. Even days are days that end in 0, 2. 4, 6, or 8. This includes single digits. So the 4th of the month, and 26th of the month are both even days.
Odd days are days that ends in 1, 3, 5, 7, and 9. Yes, this will mean that on months with 31 days, I will eat 2 days in a row. (31 then 1). This will mean the 3rd of the month, and 27th of the month are both odd days.