dob should be written as 'd.o.b.' In the English language ny shortened words is followed by a full stop / period.
'd.o.b' is short for 'date of birth'.
Correspondingly, d.o.d is 'date of death'.
In English Grammar any shortened word should be followed by a full stop, ton indicate that it is a shortneded term.
e.g. (exempli gratia)
Mr. Mister
Mrs. Missis
Messrs. Messeurs, plural of 'Mr'.
Dr. Doctor
St. Street or Saint.
Rd. Road
etc., Etcetera.
When used at the end of a sentence the full stop is then followed by a comma. Notice 'etc.,' above.
e.g.
The colours of a rainbow are red, orange, yellow, etc.,
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384 BC
Date Of Birth
Marcus Collins DOB = 15 July 1988 Hope I Helped You!
brobably 4 or 5 numbers mainly they input their dob it means six numbers.
1986 (as of Dec 29th 2013) unless your DOB is dec 30 or 31