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<year not a number>

Expects: Month and Year. Day is optional.

  • Errors checked (in order of if's)
  1. if blank or non numeric year
  2. if negative year
  3. if month number out of range, blank, or not recognized alphabetic month name
  4. if day non numeric (blank ok)
  5. if day illegal for month (eg: February 31)
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