Getting the date of next Monday

Question

How can I get the next Monday in JavaScript? I can't find anything of this in the internet and I have also tried a lot of codes and understanding of this but I can't really do it.

Here's my code:

var d = new Date();
var day = d.getDay();
d = new Date(d.setDate(d.getDate() + day + (day == 0 ? -6 : 2)));

Answer 1

This will retrieve the next Monday, returning the current date if already a Monday:

var d = new Date();
d.setDate(d.getDate() + (1 + 7 - d.getDay()) % 7);
console.log(d);

To return the following Monday even if the current date is a Monday:

var d = new Date();
d.setDate(d.getDate() + (((1 + 7 - d.getDay()) % 7) || 7));
console.log(d);

Answer 2

If the actual day of the week you want is variable (Sunday, Thursday, ...) and you want a choice whether today could be a possible match or not, and it might be that you want to start with another date (instead of today), then this function may be useful:

function getNextDayOfTheWeek(dayName, excludeToday = true, refDate = new Date()) {
    const dayOfWeek = ["sun","mon","tue","wed","thu","fri","sat"]
                      .indexOf(dayName.slice(0,3).toLowerCase());
    if (dayOfWeek < 0) return;
    refDate.setHours(0,0,0,0);
    refDate.setDate(refDate.getDate() + +!!excludeToday + 
                    (dayOfWeek + 7 - refDate.getDay() - +!!excludeToday) % 7);
    return refDate;
}

console.log("Next is: " + getNextDayOfTheWeek("Wednesday", false));

Answer 3

This will give next Monday if today is Monday

var d = new Date();
d.setDate(d.getDate() + (7-d.getDay())%7+1);

This will result in today if today is Monday

var d = new Date();
d.setDate(d.getDate() + ((7-d.getDay())%7+1) % 7);

Answer 4

If you need to handle time zones, one option would be to use the UTCDate methods setUTCDate() and getUTCDate(). This allows for consistency so the calculation is the same no matter the time zone setting.

var d = new Date();
d.setUTCDate(d.getUTCDate() + (7 - d.getUTCDay()) % 7 + 1);

(This is the example from above where on a Monday the following Monday is returned)

Answer 5

This is my solution

var days =[1,7,6,5,4,3,2];
var d = new Date();
d.setDate(d.getDate()+days[d.getDay()]);
console.log(d);

Answer 6

var closestMonday = () => {
    var curr_date = new Date(); // current date
    var day_info = 8.64e+7; // milliseconds per day
    var days_to_monday = 8 - curr_date.getDay(); // days left to closest Monday
    var monday_in_sec = curr_date.getTime() + days_to_monday * day_info; // aleary Monday in seconds from 1970 
    var next_monday = new Date(monday_in_sec); // Monday in date object
    next_monday.setHours(0,0,0);
    return next_monday;
}

Answer 7

Other responses seems not to take into account that "next Monday" should be at the beginning of the day. Here's how I've implemented it recently:

function getNextMonday() {
  const now = new Date()
  const today = new Date(now)
  today.setMilliseconds(0)
  today.setSeconds(0)
  today.setMinutes(0)
  today.setHours(0)

  const nextMonday = new Date(today)

  do {
    nextMonday.setDate(nextMonday.getDate() + 1) // Adding 1 day
  } while (nextMonday.getDay() !== 1)

  return nextMonday
}

Answer 8

Or more simple:

let now = new Date();
let day = 1; // Monday

if (day > 6 || day < 0) 
  day = 0;
    
while (now.getDay() != day) {
  now.setDate(now.getDate() + 1);
}
now.setDate(now.getDate() + 1);

console.log(now); // next Monday occurrence

Answer 9

Another way is to find the offset (in number of days) to the day you want, turn that into milliseconds, and add it to you starting date:

let d = new Date();
const day = d.getDay();
const targetDay = 1;  // Monday
let dayOffset = targetDay - day;
if (dayOffset < 0) dayOffset += 7;

d = new Date(d.getTime() + (dayOffset * 24 * 3600 * 1000));

Answer 10

Please try this

d = new Date(d);
var day = d.getDay(),
diff = d.getDate() - day + (day == 0 ? -6:1);
alert(new Date(d.setDate(diff)));

Answer 11

Using moment.js,

moment().add(7, 'days').calendar();