booter, forget it :-) Even treating the date as a string, you'd have problems.
Quite apart from trying to parse something like '310919':
1. Could it be ddmmyy? No (31 > days in Sept)
2. Could it be mmddyy? No (31 > months in year)
3. Could it be yyddmm? No (19 > months in year)
4. Could it be yymmdd? Yes! (1931:Sept:19)
treating user input as a:
"numberic [which] cannot start with 0"
raises so many issues that IMO it would be better to rethink your 'pin number' concept.
How, for example, are you going to prompt for user input?:
Enter your birthday in any format:
yymmdd (unless your birthday is between 1900 and 1909, or sin
yyddmm (unless your birthday is between 1900 and 1909, or sin
ddmmyyyy (unless your birthday is before the 10th of the mont
mmddyyyy (unless your birthday is between January and Septemb
ddmmyy (unless your birthday is before the 10th of the month)
mmddyy (unless your birthday is between January and September
How to explain that if the user's birthday is '030303', they have no choice but to enter '19030303' (if they're very old) or '20030303' (if they're very young)??
There must be a better way to do it!
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