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?

Answer 1

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   

Answer 2

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));

Answer 3

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");

Answer 4

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

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

Answer 5

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)

Answer 6

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

Date lastDayOfMonth = cal.getTime();