How to get last day of the month

Question

How can I obtain the last day of the month with the timestamp being 11:59:59 PM?

score 38 · Answer 1 · edited Oct 08 '18 at 09:56

38

function LastDayOfMonth(Year, Month) {
  return new Date((new Date(Year, Month, 1)) - 1);
}

console.log(LastDayOfMonth(2009, 11))

Example:

> LastDayOfMonth(2009, 11)
Mon Nov 30 2009 23:59:59 GMT+0100 (CET)

edited Oct 08 '18 at 09:56

S M Sajjad Salam

21
8

answered Dec 17 '09 at 21:51

miku

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1

+1 but sets time to 23:59:59.999. Maybe better to set seconds to 59.000 so `... Month, 1)) - 1000)`. :-) – RobG Jun 14 '14 at 00:51
3

I can't imagine why you'd want to leave 999ms out of a range calculation – jcollum Mar 17 '17 at 15:01
Same, the GMT is not conserved and you will get weird results when manipulating the created date object, see csukcc answer for a correct implementation – Tofandel Sep 17 '19 at 21:25

score 30 · Accepted Answer · answered Dec 17 '09 at 21:53

30

This will give you last day of current month.

var t= new Date();
alert(new Date(t.getFullYear(), t.getMonth() + 1, 0, 23, 59, 59));

answered Dec 17 '09 at 21:53

Chetan S

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No need for two Date objects: `t.setMonths(t.getMonth()+1, 0, 23, 59, 59, 0)`. – RobG Jun 14 '14 at 00:55
1

what represent the number after getMonth() please – Webwoman Mar 16 '19 at 15:39
This is not a correct answer... The GMT is not conserved – Tofandel Sep 17 '19 at 21:24

score 7 · Answer 3 · edited Oct 08 '18 at 10:02

7

var d = new Date();
console.log(d);
d.setMonth(d.getMonth() + 1); // set month as next month
console.log(d);
d.setDate(0); // get the last day of previous month
console.log(d);

Here is output from the code above:
Thu Oct 03 2013 11:34:59 GMT+0100 (GMT Daylight Time)
Sun Nov 03 2013 11:34:59 GMT+0000 (GMT Standard Time)
Thu Oct 31 2013 11:34:59 GMT+0000 (GMT Standard Time)

edited Oct 08 '18 at 10:02

S M Sajjad Salam

21
8

answered Oct 03 '13 at 10:37

csukcc

662
7
8

You could simplify this a little more by passing the date to `setMonth` like so: `d.setMonth(d.getMonth() + 1, 0)` – Jared Sep 20 '16 at 23:51

score 2 · Answer 4 · answered Feb 10 '13 at 22:36

2

var d = new Date();
m = d.getMonth(); //current month
y = d.getFullYear(); //current year
alert(new Date(y,m,1)); //this is first day of current month
alert(new Date(y,m+1,0)); //this is last day of current month

answered Feb 10 '13 at 22:36

jare25

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I've tried this, and `alert(new Date(y,m+1,0));` gives you the last day for the next month. – mickburkejnr Jan 15 '14 at 12:05
1

@mickburkejnr you may want to check again, I just tried it and it works as expected. – Jay Dadhania Sep 12 '18 at 05:07

score 1 · Answer 5 · edited Nov 19 '19 at 11:09

1

Last day of the month

now = new Date
lastDayOfTheMonth = new Date(1900+now.getYear(), now.getMonth()+1, 0)

edited Nov 19 '19 at 11:09

M.A.K. Ripon

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answered Jan 16 '14 at 16:01

david

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score 1 · Answer 6 · answered Dec 17 '15 at 07:59

1

var month = 1; // 1 for January
var d = new Date(2015, month, 0);
console.log(d); // last day in January

answered Dec 17 '15 at 07:59

Sajin M Aboobakkar

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score 1 · Answer 7 · answered May 26 '17 at 16:44

Sometimes all you have is a text version of the current month, ie: April 2017.

//first and last of the current month
var current_month = "April 2017";
var arrMonth = current_month.split(" ");
var first_day = new Date(arrMonth[0] + " 1 " + arrMonth[1]);

//even though I already have the values, I'm using date functions to get year and month
//because month is zero-based
var last_day = new Date(first_day.getFullYear(), first_day.getMonth() + 1, 0, 23, 59, 59);

//use moment,js to format       
var start = moment(first_day).format("YYYY-MM-DD");
var end = moment(last_day).format("YYYY-MM-DD");

score -1 · Answer 8 · answered Oct 22 '12 at 13:39

-1

Calendar cal = Calendar.getInstance();
cal.set(Calendar.DATE, cal.getActualMaximum(Calendar.DATE));

Date lastDayOfMonth = cal.getTime();

answered Oct 22 '12 at 13:39

yetAnotherSE

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That's some weird javascript you got there. – Pedro Jan 23 '13 at 02:09
The question is about javascript, not Java! This answer should be removed. – Jay Dadhania Sep 12 '18 at 05:04

score -1 · Answer 9 · answered Sep 19 '19 at 05:05

-1

Do not forget month started with 0 so +1 in month too.

let enddayofmonth = new Date(year, month, 0).getDate();

answered Sep 19 '19 at 05:05

Infomaster

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How to get last day of the month

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