how do you add zeros to dates when reading in file? For example the file i am reading has dates as 201433 should be 20140303 or 2014133 should be 20141303 or 2013313 should be 20140313
What will you do with 2014111 ?
I would say that you can't. You will probably need to get additional information to help decide.
You might say that 201433 could only be divided into 2014-3-3, but perhaps the missing digit is a 1 or a 2 instead of a 0. Then the intended value could be 2014-03-13 or 2014-03-23. Or perhaps the 4 is the typo and it is really in ddmmyy format so that the intended value is really 1933-12-20.
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