Add month - day and day- month combos

[DanielJDufour]

So we can avoid 31st of September situations

[DanielJDufour]

30 day months: September, April, June and November: ((?P<month>4|6|9|11)(?<sep>/-)(?<day>[0-30]))
31 day months: ((?P<month>1|2|3|5|7|8|10|12)(?<sep>/-)(?<day>[0-31]))