On a bill there's only 7 digits... that's why "million number" notes are popular...
So for birthday notes you could have a few varieties of how the date is expressed...
month, day, year day, month, year year, day, month year, month, day
and even pushing it would be
month, year, day
Some of those are acceptable expressions of calendar dates.. others not so much but this thread is not really about that...
having said there is only 7 digits... and given the year has to be 4 digits long.. that leaves us with 3 digits left..
So the combination of month and year can only be expressed in 3 digits...
Now even if one of those digits is a zero.. that will allow almost any date in the first 9 months as possible...
But for Oct. Nov. and Dec. you can only have a single day digit as you only have one space left..
This is one but not the only reason why collecting birthday notes isn't a great idea unless you can sit on a whole pile of money and expect a VERY minimal return...
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