blocks|key|4227500|text|尝尝这个|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4227501|var+startDate+=+"05/01/2011";
var+endDate+=+"09/01/2011";
var+regExp+=+/(\d{1,2})\/(\d{1,2})\/(\d{2,4})/;
if(parseInt(endDate.replace(regExp,+"$3$2$1"))+>+parseInt(startDate.replace(regExp,+"$3$2$1"))){
alert("greater");
}|code-block|syntax|javascript|4227502|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

try this

<pre><code>var startDate = "05/01/2011";
var endDate = "09/01/2011";
var regExp = /(\d{1,2})\/(\d{1,2})\/(\d{2,4})/;
if(parseInt(endDate.replace(regExp, "$3$2$1")) &gt; parseInt(startDate.replace(regExp, "$3$2$1"))){
alert("greater");
}
</code></pre>

blocks|key|5645566|text|查看此函数|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5645567|function+CompareDates()+
{+
var+str1+=+document.getElementById("Fromdate").value;+
var+str2+=+document.getElementById("Todate").value;+
var+dt1++=+parseInt(str1.substring(0,2),10);+
var+mon1+=+parseInt(str1.substring(3,5),10);+
var+yr1++=+parseInt(str1.substring(6,10),10);+
var+dt2++=+parseInt(str2.substring(0,2),10);+
var+mon2+=+parseInt(str2.substring(3,5),10);+
var+yr2++=+parseInt(str2.substring(6,10),10);+
var+date1+=+new+Date(yr1,+mon1,+dt1);+
var+date2+=+new+Date(yr2,+mon2,+dt2);+

if(date2+<+date1)+
{+
++++alert("To+date+cannot+be+greater+than+from+date");+
++++return+false;+
}+
else+
{+
++++alert("Submitting+...");+
++++document.form1.submit();+
}+
}+|code-block|syntax|javascript|5645568|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

check out this function

<pre><code>function CompareDates() 
{ 
var str1 = document.getElementById("Fromdate").value; 
var str2 = document.getElementById("Todate").value; 
var dt1 = parseInt(str1.substring(0,2),10); 
var mon1 = parseInt(str1.substring(3,5),10); 
var yr1 = parseInt(str1.substring(6,10),10); 
var dt2 = parseInt(str2.substring(0,2),10); 
var mon2 = parseInt(str2.substring(3,5),10); 
var yr2 = parseInt(str2.substring(6,10),10); 
var date1 = new Date(yr1, mon1, dt1); 
var date2 = new Date(yr2, mon2, dt2); 

if(date2 &lt; date1) 
{ 
 alert("To date cannot be greater than from date"); 
 return false; 
} 
else 
{ 
 alert("Submitting ..."); 
 document.form1.submit(); 
} 
} 
</code></pre>

blocks|key|1675736|text|如果字符串格式('dd/mm/yyyy')没有改变，则此函数应该有效：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1675737|function+endAfterStart(start,end){
++return+new+Date(start.split('/').reverse().join('/'))+<
++++++++++new+Date(end.split('/').reverse().join('/'));
}
alert(endAfterStart('05/01/2011','09/01/2011'));+//=>+true|code-block|syntax|javascript|1675738|或扩展Date.prototype|offset|length|style|CODE|1675739|Date.prototype.isBefore+=+Date.prototype.isBefore+%7C%7C+function(dat){
+++return+this+<+dat;
}
new+Date('05/01/2011'.split('/').reverse().join('/'))
+++.before(+new+Date('09/01/2011'.split('/').reverse().join('/'))+);++//=>true|1675740|entityMap^0|0|0|3|E|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|S|8|@$I|T|J|U|K|L]]|9|@]|A|$]]|$1|M|3|N|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

If the string format ('dd/mm/yyyy') doesn't change, this function should work:

<pre><code>function endAfterStart(start,end){
 return new Date(start.split('/').reverse().join('/')) &lt;
 new Date(end.split('/').reverse().join('/'));
}
alert(endAfterStart('05/01/2011','09/01/2011')); //=&gt; true
</code></pre>

Or extend the <code>Date.prototype</code>:

<pre><code>Date.prototype.isBefore = Date.prototype.isBefore || function(dat){
 return this &lt; dat;
}
new Date('05/01/2011'.split('/').reverse().join('/'))
 .before( new Date('09/01/2011'.split('/').reverse().join('/')) ); //=&gt;true
</code></pre>

blocks|key|5645623|text|我花了一些时间才找到，但是JQuery用DatePicker+date-range实现了这个功能。(源代码也可以在链接中找到。)|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|5645624|使用diff函数，Moment.js还可以很好地处理日期比较。|5645625|entityMap|0|LINK|mutability|MUTABLE|url|http://jqueryui.com/datepicker/#date-range|1|http://jqueryui.com/resources/demos/datepicker/date-range.html|2|http://momentjs.com/docs/#/displaying/difference/|3|http://momentjs.com/^0|K|A|V|A|K|A|0|V|A|1|0|2|4|2|9|9|3|0^^$0|@$1|2|3|4|5|6|7|V|8|@$9|W|A|X|B|C]|$9|Y|A|Z|B|C]]|D|@$9|10|A|11|1|12]|$9|13|A|14|1|15]]|E|$]]|$1|F|3|G|5|6|7|16|8|@]|D|@$9|17|A|18|1|19]|$9|1A|A|1B|1|1C]]|E|$]]|$1|H|3|-4|5|6|7|1D|8|@]|D|@]|E|$]]]|I|$J|$5|K|L|M|E|$N|O]]|P|$5|K|L|M|E|$N|Q]]|R|$5|K|L|M|E|$N|S]]|T|$5|K|L|M|E|$N|U]]]]

Took me some time to find, but JQuery implements this exact functionality with <a href="http://jqueryui.com/datepicker/#date-range" rel="nofollow"><code>DatePicker</code></a> <a href="http://jqueryui.com/resources/demos/datepicker/date-range.html" rel="nofollow"><code>date-range</code></a>. (Source code available in link as well.) 

<a href="http://momentjs.com/" rel="nofollow">Moment.js</a> also handles date comparisons very well using the <a href="http://momentjs.com/docs/#/displaying/difference/" rel="nofollow">diff</a> function.

blocks|key|5645627|text|尝尝这个,|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5645628|function+isDateCompare(){

var+leadDate+=+document.getElementById('strDate').value;

var+closeDate+=+document.getElementById('strDateClosed').value;

var+date1+=+new+Date();

date1.setFullYear(leadDate.substr(6,4),(leadDate.substr(3,2)-1),leadDate.substr(0,2));

var+date2+=+new+Date();

date2.setFullYear(closeDate.substr(6,4),(closeDate.substr(3,2)-1),closeDate.substr(0,2));

if+(date1>+date2)
{

alert("Expected+Closed+date+cannot+be+less+than+Lead+date.");

return+false;

}

else
{

alert("true");

return+false;

}

}|code-block|syntax|javascript|5645629|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Try this,

<pre><code>function isDateCompare(){

var leadDate = document.getElementById('strDate').value;

var closeDate = document.getElementById('strDateClosed').value;

var date1 = new Date();

date1.setFullYear(leadDate.substr(6,4),(leadDate.substr(3,2)-1),leadDate.substr(0,2));

var date2 = new Date();

date2.setFullYear(closeDate.substr(6,4),(closeDate.substr(3,2)-1),closeDate.substr(0,2));

if (date1&gt; date2)
{

alert("Expected Closed date cannot be less than Lead date.");

return false;

}

else
{

alert("true");

return false;

}

}
</code></pre>

blocks|key|5645642|text|function+isDate(value)
++++++++++++{
++++++++++++++++var+fromDate+=+document.getElementById("fromDate").value
++++++++++++++++var+toDate=+document.getElementById("toDate").value
++++++++++++++++//var+curr_Date=+new+SimpleDateFormat("dd/mm/yyyy");


++++++++++++var+dateRegEx+=+null;
++++++++++++dateRegEx+=+new+RegExp(/%5E(((0[1-9]%7C[12]\d%7C3[01])\/(0[13578]%7C1[02])\/((19%7C[2-9]\d)\d{2}))%7C((0[1-9]%7C[12]\d%7C30)\/(0[13456789]%7C1[012])\/((19%7C[2-9]\d)\d{2}))%7C((0[1-9]%7C1\d%7C2[0-8])\/02\/((19%7C[2-9]\d)\d{2}))%7C(29\/02\/((1[6-9]%7C[2-9]\d)(0[48]%7C[2468][048]%7C[13579][26])%7C((16%7C[2468][048]%7C[3579][26])00))))$/g);

++++++++++++if+(dateRegEx.test(fromDate)){
++++++++++++}
++++++++++++else{
++++++++++++++++alert("Invalid+from+date");
++++++++++++++++return+false;
++++++++++++}
++++++++++++dateRegEx+=+new+RegExp(/%5E(((0[1-9]%7C[12]\d%7C3[01])\/(0[13578]%7C1[02])\/((19%7C[2-9]\d)\d{2}))%7C((0[1-9]%7C[12]\d%7C30)\/(0[13456789]%7C1[012])\/((19%7C[2-9]\d)\d{2}))%7C((0[1-9]%7C1\d%7C2[0-8])\/02\/((19%7C[2-9]\d)\d{2}))%7C(29\/02\/((1[6-9]%7C[2-9]\d)(0[48]%7C[2468][048]%7C[13579][26])%7C((16%7C[2468][048]%7C[3579][26])00))))$/g);
++++++++++++if(dateRegEx.test(toDate))+{
++++++++++++}
++++++++++++else{
++++++++++++++++alert("Invalid+to+date");
++++++++++++++++return+false;
++++++++++++}
++++++++++++var+stDate+=+new+Date(fromDate);
++++++++++++var+enDate+=+new+Date(toDate);
++++++++++++var+compDate+=+enDate+-+stDate;
++++++++++++//var+fdate=enDate-curr_Date;

++++++++++++if(compDate+>=+0)
++++++++++++++++return+true;
++++++++++++else+
++++++++++++{
++++++++++++++++alert("To+Date+cannot+be+smaller+than+From+Date");
++++++++++++++++return+false;
++++++++++++}




++++++++++++/**/
++++++++}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|5645643|这将适用于Leap+years+also..in+dd/mm/yyyy格式(不适用于任何其他格式)。|unstyled|5645644|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|J|8|@]|9|@]|A|$]]|$1|G|3|-4|5|F|7|K|8|@]|9|@]|A|$]]]|H|$]]

<pre><code>function isDate(value)
 {
 var fromDate = document.getElementById("fromDate").value
 var toDate= document.getElementById("toDate").value
 //var curr_Date= new SimpleDateFormat("dd/mm/yyyy");


 var dateRegEx = null;
 dateRegEx = new RegExp(/^(((0[1-9]|[12]\d|3[01])\/(0[13578]|1[02])\/((19|[2-9]\d)\d{2}))|((0[1-9]|[12]\d|30)\/(0[13456789]|1[012])\/((19|[2-9]\d)\d{2}))|((0[1-9]|1\d|2[0-8])\/02\/((19|[2-9]\d)\d{2}))|(29\/02\/((1[6-9]|[2-9]\d)(0[48]|[2468][048]|[13579][26])|((16|[2468][048]|[3579][26])00))))$/g);

 if (dateRegEx.test(fromDate)){
 }
 else{
 alert("Invalid from date");
 return false;
 }
 dateRegEx = new RegExp(/^(((0[1-9]|[12]\d|3[01])\/(0[13578]|1[02])\/((19|[2-9]\d)\d{2}))|((0[1-9]|[12]\d|30)\/(0[13456789]|1[012])\/((19|[2-9]\d)\d{2}))|((0[1-9]|1\d|2[0-8])\/02\/((19|[2-9]\d)\d{2}))|(29\/02\/((1[6-9]|[2-9]\d)(0[48]|[2468][048]|[13579][26])|((16|[2468][048]|[3579][26])00))))$/g);
 if(dateRegEx.test(toDate)) {
 }
 else{
 alert("Invalid to date");
 return false;
 }
 var stDate = new Date(fromDate);
 var enDate = new Date(toDate);
 var compDate = enDate - stDate;
 //var fdate=enDate-curr_Date;

 if(compDate &gt;= 0)
 return true;
 else 
 {
 alert("To Date cannot be smaller than From Date");
 return false;
 }




 /**/
 }
</code></pre>

This will work for Leap years also..in dd/mm/yyyy format(not any other format).

blocks|key|4227640|text|第一次使用此函数将字符串转换为js中的Date类型：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4227641|function+common_getDateFromUI(str)+{
++++var+arr+=+str.split("/");
++++var+returnDate+=+new+Date(arr[2],+arr[1]+-+1,+arr[0],+0,+0,+0,+0);
++++return+returnDate;
}|code-block|syntax|javascript|4227642|第二:在获得javascript+date类型后，只需将其与date1+>+date2或date1+==+date2等普通类型进行比较即可。|4227643|或者使用此函数获取date之间的差异日期：|4227644|function+CalendarDays(startDate,+endDate)+{
++++if+(endDate+<+startDate)
++++++++return+0;

++++//+Calculate+days+between+dates
++++var+millisecondsPerDay+=+86400+*+1000;+//+Day+in+milliseconds
++++startDate.setHours(0,+0,+0,+1);+//+Start+just+after+midnight
++++endDate.setHours(23,+59,+59,+999);+//+End+just+before+midnight
++++var+diff+=+endDate+-+startDate;+//+Milliseconds+between+datetime+objects
++++var+days+=+Math.round(diff+/+millisecondsPerDay);

++++return+days;
}|4227645|点击这个链接是一个简单的演示，以获得日期之间的不同日期。Link+demo+here|offset|length|4227646|entityMap|0|LINK|mutability|MUTABLE|url|http://jsfiddle.net/james_nguyen/RfXYe/^0|0|0|0|0|0|S|E|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|Z|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|10|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|11|8|@]|9|@]|A|$]]|$1|K|3|L|5|D|7|12|8|@]|9|@]|A|$E|F]]|$1|M|3|N|5|6|7|13|8|@]|9|@$O|14|P|15|1|16]]|A|$]]|$1|Q|3|-4|5|6|7|17|8|@]|9|@]|A|$]]]|R|$S|$5|T|U|V|A|$W|X]]]]

First use this function will convert string to Date type in js:

<pre><code>function common_getDateFromUI(str) {
 var arr = str.split("/");
 var returnDate = new Date(arr[2], arr[1] - 1, arr[0], 0, 0, 0, 0);
 return returnDate;
}
</code></pre>

Second: after you get the javascript date type, you just compare it as normal type like date1 > date2 or date1 == date2. 
Or use this function to get the difference date between date:

<pre><code>function CalendarDays(startDate, endDate) {
 if (endDate &lt; startDate)
 return 0;

 // Calculate days between dates
 var millisecondsPerDay = 86400 * 1000; // Day in milliseconds
 startDate.setHours(0, 0, 0, 1); // Start just after midnight
 endDate.setHours(23, 59, 59, 999); // End just before midnight
 var diff = endDate - startDate; // Milliseconds between datetime objects
 var days = Math.round(diff / millisecondsPerDay);

 return days;
}
</code></pre>

Follow this link is a simple demo to get difference days between dates. <a href="http://jsfiddle.net/james_nguyen/RfXYe/" rel="nofollow">Link demo here</a>

blocks|key|1678690|text|if+(iForm.DiddfromDate.value+==+"")+
++{+
++++alert("++Please+enter+a+value");++
++++iForm.DiddfromDate.focus();+
++++return+false;++++
++}
+++++if+(iForm.DiddtoDate.value+==+"")+
++{+
++++alert("++Please+enter+a++value");++
++++iForm.DiddtoDate.focus();+
++++return+false;++++
++}++++++
++++++++try+{
++++++++++++var+d1+=+iForm.DiddfromDate.value.substr(0,+2);
++++++++++++var+m1+=+iForm.DiddfromDate.value.substr(3,+2);
++++++++++++var+y1+=+iForm.DiddfromDate.value.substr(6,+4);
++++++++++++var+StrDate+=+m1+%2B+"/"+%2B+d1+%2B+"/"+%2B+y1;

++++++++++++var+d2+=+iForm.DiddtoDate.value.substr(0,+2);
++++++++++++var+m2+=+iForm.DiddtoDate.value.substr(3,+2);
++++++++++++var+y2+=+iForm.DiddtoDate.value.substr(6,+4);
++++++++++++var+EndDate+=+m2+%2B+"/"+%2B+d2+%2B+"/"+%2B+y2;

++++++++++++var+startDate+=+new+Date(StrDate);
++++++++++++var+endDate+=+new+Date(EndDate);
++++++++++++if+(startDate+>+endDate)+{
++++++++++++++++alert('To+date+should+be+greater+than+From+date.');
++++++++++++++++iForm.DiddfromDate.value+=+'';
++++++++++++++++iForm.DiddtoDate.value+=+'';
++++++++++++++++iForm.DiddfromDate.focus();
++++++++++++++++return+false;
++++++++++++}
++++++++}+catch+(e)+{+alert(e.Description);+}
+return+true;|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1678691|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>if (iForm.DiddfromDate.value == "") 
 { 
 alert(" Please enter a value"); 
 iForm.DiddfromDate.focus(); 
 return false; 
 }
 if (iForm.DiddtoDate.value == "") 
 { 
 alert(" Please enter a value"); 
 iForm.DiddtoDate.focus(); 
 return false; 
 } 
 try {
 var d1 = iForm.DiddfromDate.value.substr(0, 2);
 var m1 = iForm.DiddfromDate.value.substr(3, 2);
 var y1 = iForm.DiddfromDate.value.substr(6, 4);
 var StrDate = m1 + "/" + d1 + "/" + y1;

 var d2 = iForm.DiddtoDate.value.substr(0, 2);
 var m2 = iForm.DiddtoDate.value.substr(3, 2);
 var y2 = iForm.DiddtoDate.value.substr(6, 4);
 var EndDate = m2 + "/" + d2 + "/" + y2;

 var startDate = new Date(StrDate);
 var endDate = new Date(EndDate);
 if (startDate &gt; endDate) {
 alert('To date should be greater than From date.');
 iForm.DiddfromDate.value = '';
 iForm.DiddtoDate.value = '';
 iForm.DiddfromDate.focus();
 return false;
 }
 } catch (e) { alert(e.Description); }
 return true;
</code></pre>

blocks|key|1678696|text|这是最简单的方法。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1678697|function+endAfterStart(start,+end)+{
++++var+startDate+=+new+Date(start);
++++var+endDate+++=+new+Date(end);

++++return+endDate.getTime()+>=+startDate.getTime();
}+|code-block|syntax|javascript|1678698|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Most simple way to do this.

<pre><code>function endAfterStart(start, end) {
 var startDate = new Date(start);
 var endDate = new Date(end);

 return endDate.getTime() &gt;= startDate.getTime();
} 
</code></pre>

blocks|key|1678721|text|只需将字符串转换为date，然后使用Date对象的getTime方法进行比较。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1678722|示例代码|1678723|var+startDate+=+'04/04/2015';+//date+in+dd/mm/yyyy+format
var+endDate+=+'05/04/2015';

function+compareDates(sDate,+eDate)+{
++++var+dateTime1+=+new+Date(sDate).getTime(),
++++++++dateTime2+=+new+Date(eDate).getTime();
++var+diff+=+dateTime2+-+dateTime1;
++if+(diff+>+0)+{
++++alert("endDate+is+greater+than+startDate");
++++return+true;
++}+
}
compareDates(startDate,+endDate);|code-block|syntax|javascript|1678724|Working+Fiddle|1678725|entityMap|0|LINK|mutability|MUTABLE|url|https://jsfiddle.net/murli2308/pdfcqvu1/1/^0|P|7|0|0|0|0|E|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@$9|X|A|Y|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|Z|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|10|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|11|8|@]|D|@$9|12|A|13|1|14]]|E|$]]|$1|O|3|-4|5|6|7|15|8|@]|D|@]|E|$]]]|P|$Q|$5|R|S|T|E|$U|V]]]]

Just convert the string to date and use <code>getTime</code> method of Date object to compare it. 

Example code

<pre><code>var startDate = '04/04/2015'; //date in dd/mm/yyyy format
var endDate = '05/04/2015';

function compareDates(sDate, eDate) {
 var dateTime1 = new Date(sDate).getTime(),
 dateTime2 = new Date(eDate).getTime();
 var diff = dateTime2 - dateTime1;
 if (diff &gt; 0) {
 alert("endDate is greater than startDate");
 return true;
 } 
}
compareDates(startDate, endDate);
</code></pre>

<a href="https://jsfiddle.net/murli2308/pdfcqvu1/1/" rel="nofollow">Working Fiddle</a>

Is it possible to check whether an end date is greater than or equal to a start date in Javascript? My dates are strings in the format 'dd/mm/yyyy'.

javascript check end date is greater than or equal to start date

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

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在Javascript中是否可以检查结束日期是否大于或等于开始日期？我的日期是格式为'dd/mm/yyyy‘的字符串。

问javascript检查结束日期大于或等于开始日期
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问javascript检查结束日期大于或等于开始日期EN