birthdate

As nouns the difference between anniversary and birthdate

is that anniversary is of a significant event, a day that is an exact number of years (to the day) since the event occurred often preceded by an ordinal number indicating the number of years that have elapsed since the event while birthdate is the year, month, and day of someone's birth; date of birth.

As a noun birthdate

is the year, month, and day of someone's birth; date of birth.

As an adjective undefined is

lacking a definition or value.

As nouns the difference between birthdate and null

is that birthdate is the year, month, and day of someone's birth; date of birth while null is zero, nil; the cardinal number before einn.

As nouns the difference between whelp and birthdate

is that whelp is a young offspring of a canid (ursid, felid, pinniped), especially of a dog or a wolf, the young of a bear or similar mammal (lion, tiger, seal); a pup, wolf cub while birthdate is the year, month, and day of someone's birth; date of birth.

As a verb whelp

is (ambitransitive) to give birth.

As nouns the difference between birthdate and millenium

is that birthdate is the year, month, and day of someone's birth; date of birth while millenium is misspelling of lang=en.

As nouns the difference between birthdate and birthrate

is that birthdate is the year, month, and day of someone's birth; date of birth while birthrate is the ratio of total live births to total population for a specific community or nation in a specified period; often expressed in births per thousand per year.

As nouns the difference between birthdaye and birthdate

is that birthdaye is an archaic spelling of birthday while birthdate is the year, month, and day of someone's birth; date of birth.

As nouns the difference between birthdate and date

is that birthdate is the year, month, and day of someone's birth; date of birth while date is .