It allows you to insert four digits into your date where you could previously only fit two.
In 1999, in the midst of the Y2K panic, the KY Jelly company announced it was now Y2K compliant:
Known as 'Y2KY Jelly, it now allowed you to put all four digits in your date
PIN number
My PIN number is the last four digits of pi
I heard that your mom uses her weight as her phone's pin code.
Guess that's why Apple changed it from four digits to six.
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