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Thread: validation for yyyymmdd

  1. #1
    Join Date
    Mar 2007
    Posts
    1

    validation for yyyymmdd

    HI,

    i am entering date in the format 'yyyymmdd' in the form.

    once i click save button , it must validate the date .

    any validation code ,please.

    Thanks & Regards,
    drams.

  2. #2
    Join Date
    Oct 2006
    Posts
    120
    with Date object:
    Code:
    <script type="text/javascript">
    	function isValidDate(year, month, date)
    	{
    		var flagDate = new Date(year, month, date);
    		if (year != flagDate.getFullYear() || month != flagDate.getMonth() || date != flagDate.getDate())
    		{
    			return false;
    		}
    		return true;
    	}
    	alert(isValidDate(2000, 1, 29));
    	alert(isValidDate(2001, 1, 28));
    	alert(isValidDate(2001, 1, 29));
    	alert(isValidDate(2007, 12, 1));
    </script>
    Without Date object:
    Code:
    <script type="text/javascript">
          function getDayInMonth(year, month)
          {
                if (month == 2)
                {
                      if (year % 4 == 0 && (year <= 1582 || (year % 100 != 0 || year % 400 == 0)))
                      {
                            return 29;
                      }
                      return 28;
                }
                if (month > 7) month ++;
                return (month % 2 == 0) ? 30 : 31;
          }
          
          
          function isValidDate(year, month, date)
          {
                for (i = 0; i < arguments.length; i++)
                {
                      if (isNaN(arguments[i]) || arguments[i] < 1) return false;
                }
                if (month > 12 || date > getDayInMonth(year, month)) return false;
    
                return true;
          }
          
          alert(isValidDate(2000, 2, 29));
          alert(isValidDate(2001, 4, 31));
          alert(isValidDate(2100, 2, 29));
          alert(isValidDate(1500, 2, 29));
    </script>

  3. #3
    Join Date
    May 2012
    Posts
    1
    forty2, there's one problem with your logic, javascript month in Date Object goes from 0(Jan)-11(Dec) extremely stupid i know, so it should be:
    (also added parseInt for protection)

    <script type="text/javascript">
    function isValidDate(year, month, date)
    {
    var flagDate = new Date(parseInt(year, 10), parseInt(month, 10) - 1, parseInt(date, 10));
    if (year != flagDate.getFullYear() || month != flagDate.getMonth()+1 || date != flagDate.getDate())
    {
    return false;
    }
    return true;
    }
    alert(isValidDate(2000, 1, 29));
    alert(isValidDate(2001, 1, 28));
    alert(isValidDate(2001, 1, 29));
    alert(isValidDate(2007, 12, 1));
    </script>

    PS: You should edit your post because this is thread is the one that pops out first in a google search

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