It is an ordinal value.
-----
Here's one way to see this.
Suppose you start take birthday 1 January 2000 to be 1, birthday 2 January 2000 to be 2, ... , birthday 31 January 2000 to be 31, then birthday 1 February 2000 to be 32, and so on, number all of the birthdays until today, you will have a number of about 5104. If you need birthdays before 1 January 2000 you could use negative numbers.
Clearly these numbers are ordered and form an ordinal scale.
Chat with our AI personalities