Question

I’m trying to find all the dates that would form a whole week based on a single date.

So if the date is located in the middle of the week like a Wednesday, it would return Sunday, Monday, up to Saturday.

Here’s an example:

So let’s say I have Wed 10 Oct 2012.

I would pass this date object to the function and the function would return ['2012-10-07', '2012-10-08', '2012-10-09', '2012-10-10', '2012-10-11', '2012-10-12', '2012-10-13'] (I don’t want strings, but Date objects, strings are there just for the example ^^

I already tried myself, but the method I created is very long and dumb, here it is anyways: https://gist.github.com/3889121

But what I’m primarly looking for here is instructions. What to use, is there an easier way?

Thanks!

Answer 1

Here’s a function that returns an Array of Date instances from the first sunday before the given date until the next sunday:

function getWeek(fromDate){
 var sunday = new Date(fromDate.setDate(fromDate.getDate()-fromDate.getDay()))
    ,result = [new Date(sunday)];
 while (sunday.setDate(sunday.getDate()+1) && sunday.getDay()!==0) {
  result.push(new Date(sunday));
 }
 return result;
}
// usage
var week = getWeek(new Date('2012/10/10'));
console.log(week[0]); //=> Sun Oct 07 2012 00:00:00
console.log(week[6]); //=> Sat Oct 13 2012 00:00:00 

Just for fun, a shorter version (a oneliner) using Array.map, as an extension of the Date.prototype

Date.prototype.getWeek = function(){
 return [new Date(this.setDate(this.getDate()-this.getDay()))]
          .concat(
            String(Array(6)).split(',')
               .map ( function(){
                       return new Date(this.setDate(this.getDate()+1));
                     }, this )
          );
}
// usage 
new Date('2012/10/10').getWeek(); //=> [07/10/2012, ... ,13/10/2012]