JS Get day next month starts on

July 31, 2022

How can I get the day that the next month starts on? (Monday Tuesday etc.).

I tried the following but it returns more than just the day.

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);

>Solution :

You’re almost there, just add this after your last line of code to get the name of the day

var dayName = lastDay.toLocaleDateString('en-us', { weekday: 'long' });

Also keep in mind that Date constructor’s second parameter is monthIndex MDN.

You should add m by 1 to get next month’s first day and add it by 2 and provide date = 0 to get the last day of the next month.

var date = new Date(), y = date.getFullYear(), m = date.getMonth();
var firstDay = new Date(y, m + 1, 1);
var lastDay = new Date(y, m + 2, 0);
var firstDayName = firstDay .toLocaleDateString('en-us', { weekday: 'long' }); 
var lastDayName = lastDay.toLocaleDateString('en-us', { weekday: 'long' }); 
console.log(firstDayName, lastDayName)