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Fill 4 digit year from 2 digits

/ Published in: JavaScript
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Add either 19 or 20 depending on the current year + 10

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  1. function yearAdd(inDate, id) {
  2.             if (inDate == "") {
  3.                 return;
  4.             }
  5.             var dateToCheck = inDate;
  6.             var thisDate = new Date();
  7.             var thisYear = thisDate.getFullYear().toString();
  8.             var thisyr = thisYear.substr(2, 2)
  9.             var yearToNum = parseInt(thisyr);
  10.             var yr = dateToCheck.split('/')[2];
  11.             if (yr.length == 2) {
  12.                 yr = (yr > (yearToNum+10)) ? '19' + yr : '20' + yr;
  13.  
  14.                 dateToCheck = dateToCheck.split('/'); dateToCheck[2] = yr; dateToCheck = dateToCheck.join('/');
  15.                 document.getElementById(id).value = dateToCheck;
  16.             }
  17.         }
  18.  
  19.  
  20.  
  21. use in input/text field
  22.  
  23. onblur="javascript:yearAdd(this.value, this.id);"

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