如何获得本月的最后一天

Question

如何获取时间戳为晚上 11:59:59 的月份的最后一天？

Answer 1

 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 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

 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)

Answer 4

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 5

Last day of the month

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

Answer 6

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

Answer 7

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 8

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

Date lastDayOfMonth = cal.getTime();

Answer 9

不要忘记月份以 0 开头，因此月份也是 +1。

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