Needs dd/mm/yyyy birthdate format from a string in javascript

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  • neelsfer
    Contributor
    • Oct 2010
    • 547
    #1

    Needs dd/mm/yyyy birthdate format from a string in javascript

    I need to change a South African ID number to the date of birth (DOB)dd/mm/yyyy using javascript
    example of ID Number - 0203185149088.
    My code gives it as 18/03/02 instead of 18/03/2002 and if ID No is 6202185155087 then i get 18/02/62 and not 18/02/1962
    The years before 2000 and after needs to be added please
    dd/mm/yyyy
    Please assist
    Code:
    	<form>
		<input type="text" name="idno" id="idno" value="" placeholder="ID Number" onkeyup="dateOfBirthsum();" />
		<input type="text" name="dob" id="dob"  placeholder="birthdate"/>
		
	</form>
    javascript
    Code:
    <script>
	
function dateOfBirthsum()
{    var idnumInput = document.getElementById('idno').value;

	var dateDay = idnumInput.substring(4,6);
	var dateMonth = idnumInput.substring(2,4);
	var dateYear = idnumInput.substring(0,2);
   var result = dateDay + "/" + dateMonth + "/" + dateYear;
	document.getElementById('dob').value = result;
	}
	</script>

    I got this code somewhere but cannot add it
    Code:
    var year      	= id_number.substr ( 0  , 2 );
					var nowYearNotCentury = currentTime.getFullYear() + '';
					nowYearNotCentury = nowYearNotCentury.substr(2,2);
					if (year <= nowYearNotCentury){
						date = '20' + year+ "-" + id_number.substr(2, 2) + "-" + id_number.substr(4, 2);
					} else {
						date = '19' + year+ "-" + id_number.substr(2, 2) + "-" + id_number.substr(4, 2);
					}//end if
    Tags: None
    • neelsfer
      Contributor
      • Oct 2010
      • 547
      #2
      After 3 hours of struggling, i got it working. Anybody else needing a very basic solution, here it is
      Code:
       <body>
	<form>
		<input type="text" name="idno" id="idno" value="" placeholder="ID Number" onkeyup="dateOfBirthsum();" />
		
		<input type="text" name="dob2" id="dob2"  placeholder="birthdate2"/>
	</form>
<script>
	
function dateOfBirthsum()
{    var idnumInput = document.getElementById('idno').value;

	var dateDay = idnumInput.substring(4,6);
	var dateMonth = idnumInput.substring(2,4);
	var dateYear = idnumInput.substring(0,2);

	var dateYear1 = '19' + dateYear;
    var dateYear2 = '20' + dateYear;
	var Year1 = dateYear;
    var Year2 = dateYear;
	var years = new Date();
	var dateYear3 = years.getFullYear();
	var dateYear3a = idnumInput.substring(0,2);
	
  if (dateYear1 < dateYear3a){
			result3	= dateDay + "/" + dateMonth + "/" + '19' + dateYear;
					} else {
						result3	= dateDay + "/" + dateMonth + "/" + '20' + dateYear;
					}
	
	document.getElementById('dob2').value = result3;
	
	}
	</script>

        Comment

        • Dormilich
          Recognized Expert Expert
          • Aug 2008
          • 8694
          #3
          out of curiousity, how do you determine the DoB for people older than 100 years?

            Comment

            • neelsfer
              Contributor
              • Oct 2010
              • 547
              #4
              Thx for comment. It is for a cycling races online registration site. I don't expect to many 101 year old cyclist's to enter.

                Comment

                • Dormilich
                  Recognized Expert Expert
                  • Aug 2008
                  • 8694
                  #5
                  OK. please keep us updated, if they do.

                    Comment

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