CODEWITHSUNDEEP
javascriptdate
Marco Mancarne
Marco Mancarne

Reputation: 73

Get array of days by week number starting on Mondays in JavaScript

For a scheduling application, I need to display the weekdays by week numbers starting on Mondays. So far I got to:

var options = {
  weekday: 'long',
  year: 'numeric',
  month: 'long',
  day: 'numeric'
};
const weekDays = [];

for (let index = 1; index < 7; index++) {
  weekDays.push(new Date(year, 0, index + (week - 1) * 7).toLocaleDateString('nl-NL', options));
}

This code displays a range of dates given by a week and year, but can't seem to get it to start on mondays. Any ideas am I missing something ?

Upvotes: 2

Views: 1037

Answers (1)

Vincent Vancalbergh
Vincent Vancalbergh

Reputation: 3327

You're assuming that January 1st of each year starts on a monday. This piece of code automatically finds the first monday of each year.

var year = 2016;
var week = 1;
var index = 1;
var options = {
  weekday: 'long',
  year: 'numeric',
  month: 'long',
  day: 'numeric'
};
var d = new Date(year, 0, index + (week - 1) * 7);
var weekday = d.getDay();
var diff = 1 - weekday;
if (diff < 0) {
  diff = diff + 7;
}
d.setDate(d.getDate() + diff);

console.log(d.toLocaleString(undefined, options));

Upvotes: 1

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