blocks|key|4573085|text|您可以直接将其用于该月的结束日期或开始日期|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4573086|new+moment().startOf('month').format("YYYY-DD-MM");
new+moment().endOf("month").format("YYYY-DD-MM");|code-block|syntax|javascript|4573087|您可以通过定义新格式来更改格式|4573088|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

you can use this directly for the end or start date of the month

<pre><code>new moment().startOf('month').format("YYYY-DD-MM");
new moment().endOf("month").format("YYYY-DD-MM");
</code></pre>

you can change the format by defining a new format

blocks|key|4572983|text|当你使用.endOf()时，你是在改变被调用的对象，所以startDate变成了Sep+30|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|4572984|您应该使用.clone()来制作它的副本，而不是更改它|4572985|var+startDate+=+moment(year+%2B+'-'+%2B+month+%2B+'-'+%2B+01+%2B+'+00:00:00');
++++++++++++var+endDate+=+startDate.clone().endOf('month');
++++++++++++console.log(startDate.toDate());
++++++++++++console.log(endDate.toDate());

Mon+Sep+01+2014+00:00:00+GMT%2B0700+(ICT)+
Tue+Sep+30+2014+23:59:59+GMT%2B0700+(ICT)+|code-block|syntax|javascript|4572986|entityMap^0|4|8|S|9|0|5|8|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]|$9|R|A|S|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|T|8|@$9|U|A|V|B|C]]|D|@]|E|$]]|$1|H|3|I|5|J|7|W|8|@]|D|@]|E|$K|L]]|$1|M|3|-4|5|6|7|X|8|@]|D|@]|E|$]]]|N|$]]

When you use <code>.endOf()</code> you are mutating the object it's called on, so <code>startDate</code> becomes Sep 30

You should use <code>.clone()</code> to make a copy of it instead of changing it

<pre><code>var startDate = moment(year + '-' + month + '-' + 01 + ' 00:00:00');
 var endDate = startDate.clone().endOf('month');
 console.log(startDate.toDate());
 console.log(endDate.toDate());

Mon Sep 01 2014 00:00:00 GMT+0700 (ICT) 
Tue Sep 30 2014 23:59:59 GMT+0700 (ICT) 
</code></pre>

blocks|key|4573181|text|尝试以下代码：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4573182|const+moment=require('moment');
console.log("startDate=>",moment().startOf('month').format("YYYY-DD-MM"));
console.log("endDate=>",moment().endOf('month').format("YYYY-DD-MM"));|code-block|syntax|javascript|4573183|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 the following code:

<pre><code>const moment=require('moment');
console.log("startDate=&gt;",moment().startOf('month').format("YYYY-DD-MM"));
console.log("endDate=&gt;",moment().endOf('month').format("YYYY-DD-MM"));
</code></pre>

blocks|key|4573015|text|我真的不认为有什么直接的方法可以得到最后一天，但你可以这样做：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4573016|var+dateInst+=+new+moment();
/**
+*+adding+1+month+from+the+present+month+and+then+subtracting+1+day,+
+*+So+you+would+get+the+last+day+of+this+month+
+*/
dateInst.add(1,+'months').date(1).subtract(1,+'days');
/*+printing+the+last+day+of+this+month's+date+*/
console.log(dateInst.format('YYYY+MM+DD'));|code-block|syntax|javascript|4573017|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|$]]

Don't really think there is some direct method to get the last day but you could do something like this:

<pre><code>var dateInst = new moment();
/**
 * adding 1 month from the present month and then subtracting 1 day, 
 * So you would get the last day of this month 
 */
dateInst.add(1, 'months').date(1).subtract(1, 'days');
/* printing the last day of this month's date */
console.log(dateInst.format('YYYY MM DD'));
</code></pre>

blocks|key|66585|text|您的startDate是每月的第一天，在这种情况下，我们可以使用|type|unstyled|depth|inlineStyleRanges|entityRanges|data|66586|var+endDate+=+moment(startDate).add(1,+'months').subtract(1,+'days');|code-block|syntax|javascript|66587|希望这能有所帮助！！|66588|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

your startDate is first-day-of-month, In this case we can use

<pre><code>var endDate = moment(startDate).add(1, 'months').subtract(1, 'days');
</code></pre>

Hope this helps!!

blocks|key|4573114|text|var+d+=+new+moment();
var+startMonth+=+d.clone().startOf('month');
var+endMonth+=+d.clone().endOf('month');
console.log(startMonth,+endMonth);|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|4573115|doc|unstyled|offset|length|4573116|entityMap|0|LINK|mutability|MUTABLE|url|https://momentjs.com/docs/#/manipulating/end-of/^0|0|0|3|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|R|8|@]|9|@$G|S|H|T|1|U]]|A|$]]|$1|I|3|-4|5|F|7|V|8|@]|9|@]|A|$]]]|J|$K|$5|L|M|N|A|$O|P]]]]

<pre><code>var d = new moment();
var startMonth = d.clone().startOf('month');
var endMonth = d.clone().endOf('month');
console.log(startMonth, endMonth);
</code></pre>

<a href="https://momentjs.com/docs/#/manipulating/end-of/" rel="nofollow noreferrer">doc</a>

blocks|key|4573128|text|​|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4573129|const+year+=+2014;
const+month+=+09;

//+months+start+at+index+0+in+momentjs,+so+we+subtract+1
const+startDate+=+moment([year,+month+-+1,+01]).format("YYYY-MM-DD");

//+get+the+number+of+days+for+this+month
const+daysInMonth+=+moment(startDate).daysInMonth();

//+we+are+adding+the+days+in+this+month+to+the+start+date+(minus+the+first+day)
const+endDate+=+moment(startDate).add(daysInMonth+-+1,+'days').format("YYYY-MM-DD");

console.log(`start+date:+${startDate}`);
console.log(`end+date:+++${endDate}`);|code-block|syntax|javascript|4573130|<script
src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.20.1/moment.min.js">
</script>|4573131|4573132|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|M|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|I|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|P|8|@]|9|@]|A|$]]]|K|$]]

<div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
<div class="snippet-code">
<pre class="snippet-code-js lang-js prettyprint-override"><code>const year = 2014;
const month = 09;

// months start at index 0 in momentjs, so we subtract 1
const startDate = moment([year, month - 1, 01]).format("YYYY-MM-DD");

// get the number of days for this month
const daysInMonth = moment(startDate).daysInMonth();

// we are adding the days in this month to the start date (minus the first day)
const endDate = moment(startDate).add(daysInMonth - 1, 'days').format("YYYY-MM-DD");

console.log(`start date: ${startDate}`);
console.log(`end date: ${endDate}`);</code></pre>
<pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;script
src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.20.1/moment.min.js"&gt;
&lt;/script&gt;</code></pre>
</div>
</div>

blocks|key|66768|text|const+dates+=+getDatesFromDateRange("2014-05-02",+"2018-05-12",+"YYYY/MM/DD",+1);+++++++++++
console.log(dates);
//+you+get+the+whole+from-to+date+ranges+as+per+parameters
var+onlyStartDates+=+dates.map(dateObj+=>+dateObj["to"]);
console.log(onlyStartDates);
//+moreover,+if+you+want+only+from+dates+then+you+can+grab+by+"map"+function

function+getDatesFromDateRange(+startDate,+endDate,+format,+counter+)+{
++++startDate+=+moment(startDate,+format);
++++endDate+=+moment(endDate,+format);

++++let+dates+=+[];
++++let+fromDate+=+startDate.clone();
++++let+toDate+=+fromDate.clone().add(counter,+"month").startOf("month").add(-1,+"day");
++++do+{
++++++++dates.push({
++++++++++++"from":+fromDate.format(format),
++++++++++++"to":+(+toDate+<+endDate+)+?+toDate.format(format)+:+endDate.format(format)
++++++++});
++++++++fromDate+=+moment(toDate,+format).add(1,+"day").clone();
++++++++toDate+=+fromDate.clone().add(counter,+"month").startOf("month").add(-1,+"day");
++++}+while+(+fromDate+<+endDate+);
++++return+dates;
}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|66769|请注意，.clone()在momentjs中是必不可少的，否则它将覆盖该值。你的情况似乎就是这样。|unstyled|66770|更通用的是，获取介于日期之间的一串日期。|66771|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|L|8|@]|9|@]|A|$]]|$1|G|3|H|5|F|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|F|7|N|8|@]|9|@]|A|$]]]|J|$]]

<pre><code>const dates = getDatesFromDateRange("2014-05-02", "2018-05-12", "YYYY/MM/DD", 1); 
console.log(dates);
// you get the whole from-to date ranges as per parameters
var onlyStartDates = dates.map(dateObj =&gt; dateObj["to"]);
console.log(onlyStartDates);
// moreover, if you want only from dates then you can grab by "map" function

function getDatesFromDateRange( startDate, endDate, format, counter ) {
 startDate = moment(startDate, format);
 endDate = moment(endDate, format);

 let dates = [];
 let fromDate = startDate.clone();
 let toDate = fromDate.clone().add(counter, "month").startOf("month").add(-1, "day");
 do {
 dates.push({
 "from": fromDate.format(format),
 "to": ( toDate &lt; endDate ) ? toDate.format(format) : endDate.format(format)
 });
 fromDate = moment(toDate, format).add(1, "day").clone();
 toDate = fromDate.clone().add(counter, "month").startOf("month").add(-1, "day");
 } while ( fromDate &lt; endDate );
 return dates;
}
</code></pre>

Please note, .clone() is essential in momentjs else it'll override the value. It seems in your case. 

It's more generic, to get bunch of dates that fall between dates.

blocks|key|66679|text|下面的代码应该可以工作：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|66680|$('#reportrange').daterangepicker({
++++++++++++++++startDate:+start,
++++++++++++++++endDate:+end,
++++++++++++++++ranges:+{
++++++++++++++++++++'Hoy':+[moment(),+moment()],
++++++++++++++++++++'Ayer':+[moment().subtract(1,+'days'),+moment().subtract(1,+'days')],
++++++++++++++++++++'Ultimos+7+dias':+[moment().subtract(6,+'days'),+moment()],
++++++++++++++++++++'Ultimos+30+dias':+[moment().subtract(29,+'days'),+moment()],
++++++++++++++++++++'Mes+actual':+[moment().startOf('month'),+moment().endOf('month')],
++++++++++++++++++++'Ultimo+mes':+[moment().subtract(1,+'month').startOf('month'),+moment().subtract(1,+'month').endOf('month')],
++++++++++++++++++++'Enero':+[moment().month(0).startOf('month')+,+moment().month(0).endOf('month')],
++++++++++++++++++++'Febrero':+[moment().month(1).startOf('month')+,+moment().month(1).endOf('month')],
++++++++++++++++++++'Marzo':+[moment().month(2).startOf('month')+,+moment().month(2).endOf('month')],
++++++++++++++++++++'Abril':+[moment().month(3).startOf('month')+,+moment().month(3).endOf('month')],
++++++++++++++++++++'Mayo':+[moment().month(4).startOf('month')+,+moment().month(4).endOf('month')],
++++++++++++++++++++'Junio':+[moment().month(5).startOf('month')+,+moment().month(5).endOf('month')],
++++++++++++++++++++'Julio':+[moment().month(6).startOf('month')+,+moment().month(6).endOf('month')],
++++++++++++++++++++'Agosto':+[moment().month(7).startOf('month')+,+moment().month(7).endOf('month')],
++++++++++++++++++++'Septiembre':+[moment().month(8).startOf('month')+,+moment().month(8).endOf('month')],
++++++++++++++++++++'Octubre':+[moment().month(9).startOf('month')+,+moment().month(9).endOf('month')],
++++++++++++++++++++'Noviembre':+[moment().month(10).startOf('month')+,+moment().month(10).endOf('month')],
++++++++++++++++++++'Diciembre':+[moment().month(11).startOf('month')+,+moment().month(11).endOf('month')]
++++++++++++++++}
++++++++++++},+cb);|code-block|syntax|javascript|66681|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|$]]

The following code should work:

<pre><code>$('#reportrange').daterangepicker({
 startDate: start,
 endDate: end,
 ranges: {
 'Hoy': [moment(), moment()],
 'Ayer': [moment().subtract(1, 'days'), moment().subtract(1, 'days')],
 'Ultimos 7 dias': [moment().subtract(6, 'days'), moment()],
 'Ultimos 30 dias': [moment().subtract(29, 'days'), moment()],
 'Mes actual': [moment().startOf('month'), moment().endOf('month')],
 'Ultimo mes': [moment().subtract(1, 'month').startOf('month'), moment().subtract(1, 'month').endOf('month')],
 'Enero': [moment().month(0).startOf('month') , moment().month(0).endOf('month')],
 'Febrero': [moment().month(1).startOf('month') , moment().month(1).endOf('month')],
 'Marzo': [moment().month(2).startOf('month') , moment().month(2).endOf('month')],
 'Abril': [moment().month(3).startOf('month') , moment().month(3).endOf('month')],
 'Mayo': [moment().month(4).startOf('month') , moment().month(4).endOf('month')],
 'Junio': [moment().month(5).startOf('month') , moment().month(5).endOf('month')],
 'Julio': [moment().month(6).startOf('month') , moment().month(6).endOf('month')],
 'Agosto': [moment().month(7).startOf('month') , moment().month(7).endOf('month')],
 'Septiembre': [moment().month(8).startOf('month') , moment().month(8).endOf('month')],
 'Octubre': [moment().month(9).startOf('month') , moment().month(9).endOf('month')],
 'Noviembre': [moment().month(10).startOf('month') , moment().month(10).endOf('month')],
 'Diciembre': [moment().month(11).startOf('month') , moment().month(11).endOf('month')]
 }
 }, cb);
</code></pre>

blocks|key|4573228|text|尝试以下代码：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4573229|moment(startDate).startOf('months')
moment(startDate).endOf('months')|code-block|syntax|javascript|4573230|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 the following code:

<pre><code>moment(startDate).startOf('months')
moment(startDate).endOf('months')
</code></pre>

I need to calculate a JS date given year=2014 and month=9 (September 2014).

I tried this:

<pre><code>var moment = require('moment');
var startDate = moment( year+'-'+month+'-'+01 + ' 00:00:00' );
 var endDate = startDate.endOf('month');
 console.log(startDate.toDate());
 console.log(endDate.toDate());
</code></pre>

Both of logs show:

<pre><code>Tue Sep 30 2014 23:59:59 GMT+0200 (CEST)
Tue Sep 30 2014 23:59:59 GMT+0200 (CEST)
</code></pre>

End date is correct but... why the start date is not?

Moment JS start and end of given month

我需要计算给定year=2014和month=9的JS日期(2014年9月)。我试过这个：var moment = require('moment');var startDate = moment( year+'-'+month+'-'+01 + ' 00:00:00' );            var endDate = startDate.endOf('month');           

问给定月份的时刻JS开始和结束
EN

回答 10

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问给定月份的时刻JS开始和结束EN

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问给定月份的时刻JS开始和结束
EN