A date of birth was the date on which someone or something was born. The anniversary of this date was known as a birthday.
In 2368, Lieutenant Worf did not know his son Alexander Rozhenko's date of birth, which disappointed Alexander. (TNG: "New Ground")
Known dates of birth[]
- Alexander Rozhenko: the forty-third day of Maktag, on stardate 43205. (TNG: "New Ground")
- Elizabeth Dehner: stardate 1089.5. (TOS: "Where No Man Has Gone Before")
- Gary Mitchell: stardate 1087.7. (TOS: "Where No Man Has Gone Before")
- James T. Kirk: 22 March 2233, on stardate C 1277.1. (TOS: "Where No Man Has Gone Before", "The Deadly Years"; ENT: "In a Mirror, Darkly, Part II"; Star Trek)
- Spock: 6 January 2230, stardate 2230.06. (Star Trek Beyond)