To continue this despite the condescending remarks. I am aware of the number of digits on current notes.
1935 had 6:
1937-54 had 7:
1979 $5 & $20 had 11:
Current notes have 7.
A birthday format made from 6 digits is difficult, but not bad. 380712, 1938 July 12.
Seven digits, 1938 July 12, -380712 or 380712-:
11 digits similar, but the entire year can be put in place. --19380712-, or ---19380712.
It is the order of how birthday notes should be agreed upon, not anything with the correct digits anywhere on the note.
Phone numbers are the best, as once the area code is dropped, they all fit in order.
Rick