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 reall

Answer 1

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 2

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 3

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