Tense usage in relation to date of birth of deceased individuals [duplicate]
Bob's date of death is xxx.
The late Bob's date of birth (DOB) or birth date is / was xxx.
It just depends on what spin you want to put on it. If you are talking regarding the factual DOB for this guy, feel free to use is, as it still is his DOB.
If you are talking more about Bob, or want to recognize that the guy has passed away, feel free to use was.
I would probably use was in most cases because the person whose DOB we are talking about has gone west.