Birth dates are normally written in some form of numeric combination. However, there are times when you may need to write a birth date out in words. Instances in which this is most likely to occur are formal types of writing, such as invitations and announcements. Writing a birth date out in words takes a little longer than writing it in numbers, but it is a simple process that you can complete quite easily.
Spell out the month of birth. For instance, you start by writing out "September" or "July."
Spell out the day of the month that coincides with the birthday. For example, you would write "September fifth" or "July twenty-first."
Spell out the year last. The final written birth date would read "September fifth, nineteen seventy-nine," or "July twenty-first, two thousand eight."
- Alfredo Tisi/Demand Media