It's just four digits.
The MONTH and day.
The Big Bang Theory Season 9, Episode 9
I don't care if
you're the Employee
of the fuckin' Month.
Westworld Season 2, Episode 7
The MONTH squared equals the
square of the sum of the members
The Big Bang Theory Season 11, Episode 17
- Every other MONTH or twice a MONTH?
- Twice a MONTH.
The Big Bang Theory Season 1, Episode 14
...all the weekends of a given MONTH
plus three weeknights."
The Big Bang Theory Season 2, Episode 10