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POStart date must be earlier than end date
 

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    <p>I am comparing some dropdownlist value, basically the Start date must be earlier than end date <br/><br/>I found a lot of sample source codes through goggle and others, but they only provide DD/MM/YYYY. <br/> I only need MM/YYY only, when ever i tried to remove "DD" there would be errors, if i am right its because of the date keyword/element. </p> <p>Is there any solution to it? any help or ref link would be good. Thanks </p> <p>P.s The codes below are working for DD/MM/YYYY</p> <p> <pre><code>function y2k(number) { return (number &lt; 1000) ? number + 1900 : number; } function padout(number) { return (number &lt; 10) ? '0' + number : number; } function validate(what) { var startday = what.startday.options[what.startday.selectedIndex].value; var startmonth = what.startmonth.options[what.startmonth.selectedIndex].value; var startyear = what.startyear.options[what.startyear.selectedIndex].text; var endday = what.endday.options[what.endday.selectedIndex].value; var endmonth = what.endmonth.options[what.endmonth.selectedIndex].value; unvalidstartdate = startday + '/' + startmonth + '/' + startyear; unvalidenddate = endday + '/' + endmonth; var startdate = new Date(startyear - 0, startmonth - 1, startday - 0); var enddate = new Date(endmonth - 1, endday - 0); var validstartdate = padout(startdate.getDate()) + '/' + padout(startdate.getMonth() + 1) + '/' + y2k(startdate.getYear()) var validenddate = padout(enddate.getDate()) + '/' + padout(enddate.getMonth() + 1) + '/' + y2k(enddate.getYear()); if (unvalidstartdate != validstartdate) { alert('Start Date: ' + what.startday.options[what.startday.selectedIndex].text + ' ' + what.startmonth.options[what.startmonth.selectedIndex].text + ' ' + what.startyear.options[what.startyear.selectedIndex].text + ' is invalid'); return false; } if (unvalidenddate != validenddate) { alert('End Date: ' + what.endday.options[what.endday.selectedIndex].text + ' ' + what.endmonth.options[what.endmonth.selectedIndex].text + ' ' + ' is invalid'); return false; } starttime = Date.UTC(y2k(startdate.getYear()), startdate.getMonth(), startdate.getDate(), 0, 0, 0); endtime = Date.UTC(y2k(enddate.getYear()), enddate.getMonth(), enddate .getDate(), 0, 0, 0); if (starttime &lt; endtime) { alert('VALID'); // valid } else { alert('NOT VALID'); return false; } currentdate = new Date(); currenttime = Date.UTC(y2k(currentdate.getYear()), currentdate .getMonth(), currentdate.getDate(), 0, 0, 0); if (endtime &lt; currenttime) { // valid } else { alert('End Date is not less than todays date'); return false; } what.startdate.value = validstartdate; what.enddate.value = validenddate; return true; } //--&gt; &lt;/script&gt; &lt;form&gt; Start Date: &lt;select name="startday"&gt; &lt;option value="01"&gt;1st &lt;option value="02"&gt;2nd &lt;option value="03"&gt;3rd &lt;/select&gt; &lt;select name="startmonth"&gt; &lt;option value="01"&gt;january &lt;option value="02"&gt;february &lt;option value="03"&gt;march &lt;/select&gt; &lt;select name="startyear"&gt; &lt;option&gt;1990 &lt;option&gt;1991 &lt;option&gt;1992 &lt;/select&gt; &lt;p&gt; End Date: &lt;select name="endday"&gt; &lt;option value="01"&gt;1st &lt;option value="02"&gt;2nd &lt;option value="03"&gt;3rd &lt;/select&gt; &lt;select name="endmonth"&gt; &lt;option value="01"&gt;january &lt;option value="02"&gt;february &lt;option value="03"&gt;march &lt;/select&gt; &lt;input type="hidden" name="startdate"&gt; &lt;input type="hidden" name="enddate"&gt; &lt;p&gt; &lt;input type="button" onClick="validate(this.form)" value="Validate"&gt; &lt;/form&gt; </code></pre>
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