validation for yyyymmdd

@forty2Mar 24.2007 — #with Date object:

<i>
 </i>&lt;script type="text/javascript"&gt;
 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));
 &lt;/script&gt;

Without Date object:

<i>
 </i>&lt;script type="text/javascript"&gt;
 function getDayInMonth(year, month)
 {
 if (month == 2)
 {
 if (year % 4 == 0 &amp;&amp; (year &lt;= 1582 || (year % 100 != 0 || year % 400 == 0)))
 {
 return 29;
 }
 return 28;
 }
 if (month &gt; 7) month ++;
 return (month % 2 == 0) ? 30 : 31;
 }
 
 
 <i>    </i>  function isValidDate(year, month, date)
 <i>    </i>  {
 <i>    </i>        for (i = 0; i &lt; arguments.length; i++)
 <i>    </i>        {
 <i>    </i>              if (isNaN(arguments[i]) || arguments[i] &lt; 1) return false;
 <i>    </i>        }
 <i>    </i>        if (month &gt; 12 || date &gt; getDayInMonth(year, month)) return false;
 
 <i>    </i>        return true;
 <i>    </i>  }
 
 <i>    </i>  alert(isValidDate(2000, 2, 29));
 <i>    </i>  alert(isValidDate(2001, 4, 31));
 <i>    </i>  alert(isValidDate(2100, 2, 29));
 <i>    </i>  alert(isValidDate(1500, 2, 29));
 &lt;/script&gt;

@RMirandaMay 03.2012 — #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)

{

[COLOR="Red"]var flagDate = new Date(parseInt(year, 10), parseInt(month, 10) - 1, parseInt(date, 10)); [/COLOR]

if (year != flagDate.getFullYear() || month != flagDate.getMonth()[COLOR="Red"]+1[/COLOR] || 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 ?

validation for yyyymmdd

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