how to get first date and last date from month and year in javascript

Question

Can any one help me to find first date and last date from month and year. I have 2 parameter month and year, for example month = 10 and year = 2021

I tried some code but it doesn't have the answer

var prevMonthLastDay = new Date(2021, 10, 0);
var thisMonthFirstDay = new Date(2021, 10, 1);
console.log(prevMonthLastDay);
console.log(thisMonthFirstDay);

Above code is giving following output:

2021-10-30T17:00:00.000Z
2021-10-31T17:00:00.000Z 

My expected answer is first date 2021-10-01 and last date 2021-10-31

Answer 1

You can try this way

var date = new Date();
var firstDay = new Date(date.getFullYear(), date.getMonth(), 1);
var lastDay = new Date(date.getFullYear(), date.getMonth() + 1, 0);

Answer 2

You can follow this.

//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");

the answer is in the following link: How to get last day of the month

Answer 3

Try the following to get your expected output:

 function GetFirstAndLastDate(year, month) { var firstDayOfMonth = new Date(year, month-1, 2); var lastDayOfMonth = new Date(year, month, 1); console.log('First Day: ' + firstDayOfMonth.toISOString().substring(0, 10)); console.log('Last Day: ' + lastDayOfMonth.toISOString().substring(0, 10)); } GetFirstAndLastDate(2021, 10);

Answer 4

I'm a little bit confused with what you really want to get referencing your variable names, so I include them all:

const currentYear = 2021;
const currentMonth = 10;

const prevMonthFirstDay = new Date(currentYear, currentMonth - 2, 1);
const prevMonthLastDay = new Date(currentYear, currentMonth - 1, 0);

const currentMonthFirstDay = new Date(currentYear, currentMonth - 1, 1);
const currentMonthLastDay = new Date(currentYear, currentMonth, 0);

const nextMonthFirstDay = new Date(currentYear, currentMonth, 1);
const nextMonthLastDay = new Date(currentYear, currentMonth + 1, 0);

console.log('prev month first day:', prevMonthFirstDay);
console.log('prev month last day:', prevMonthLastDay);
console.log('current month first day:', currentMonthFirstDay);
console.log('current month last day:', currentMonthLastDay);
console.log('next month first day:', nextMonthFirstDay);
console.log('next month last day:', nextMonthLastDay);

on my system this will gives:

prev month first day: Wed Sep 01 2021 00:00:00 GMT+0700 (Western Indonesia Time)
prev month last day: Thu Sep 30 2021 00:00:00 GMT+0700 (Western Indonesia Time)
current month first day: Fri Oct 01 2021 00:00:00 GMT+0700 (Western Indonesia Time)
current month last day: Sun Oct 31 2021 00:00:00 GMT+0700 (Western Indonesia Time)
next month first day: Mon Nov 01 2021 00:00:00 GMT+0700 (Western Indonesia Time)
next month last day: Tue Nov 30 2021 00:00:00 GMT+0700 (Western Indonesia Time)

so now it will only a matter of formatting:

console.log(currentMonthFirstDay.toLocaleDateString('en-GB').split('/').reverse().join('-'));

which will give you:

2021-10-01

Answer 5

You can try this way referrence

var date = new Date(), y = date.getFullYear(), m = date.getMonth();
var firstDay = new Date(y, m, 1);
var lastDay = new Date(y, m + 1, 0);