Creating javascript dates object

In JavaScript, Date is a reference type. If you assign it to another var, the other var becomes a reference to the original date. So in this case, you end up with 59 pointers to the same date.

Solution: to actually makes copies of the date, you should clone it, by writing

dates[i] = new Date(date.getTime());

var dates = [];
getDateRange();

function getDateRange() {

  var today = new Date();
  var date = new Date();

  for (var i = 0; i <= 59; i++) {
    date.setDate(today.getDate()+i);
    console.log(date);
    dates[i] = new Date(date.getTime());
  };

  console.log(dates);
}

Try creating a new date every iteration instead of using the same date object:

function getDateRange() {

  var today = new Date();
  var date = new Date();

  for (var i = 0; i <= 59; i++) {
    var temp = new Date();
    temp.setDate(today.getDate()+i);
    console.log(temp);
    dates[i] = temp;
  };

  console.log(dates);
}

In your case you were assigning the same date object to every location of the array and every time you update the date object all locations get updated because they all point to the same Date object.

You need to assign each member of your array to a unique new Date() instance.

In your example, the console.log() call correctly outputs the new time you've set date to in each iteration of the loop... but you're just changing the same Date object. Because every index of the array references the same Date object, they all point to the last set time (hence your problem).