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Date of birth is considered a ratio variable, not ordinal or interval. While it can indicate order (when someone was born before or after another), it also has a true zero point (the start of the calendar) and allows for meaningful comparisons of differences in age. This distinguishes it from ordinal (which only indicates order) and interval (which lacks a true zero) scales.
The longest documented time interval between the birth of twins is 87 days. This unusual case occurred in 2012 when a woman in Ireland gave birth to one twin prematurely, and the second twin was delivered nearly three months later. Such extended intervals are extremely rare and typically involve medical intervention to prolong the pregnancy of the second twin.
Open interval does not include its end points while closed interval includes
An interval is the spacing of time. For example: I ran for an interval of 10 minutes then walked for an interval of 30 minutes. Or each car has an interval of 0.5 seconds.
There is no interval in a single number.