Determine intuitive difference between two dates

date_difference.js

function date_difference(from_date, to_date) {
  if (to_date < from_date) {
    return date_difference(to_date, from_date);
  }
  
  var DAY_IN_MS = 1000 * 60 * 60 * 24;
  
  // count first day
  from_date = new Date(from_date.getTime() - DAY_IN_MS);

  var days = 0;
  var months = 0;
  var years = 0;
  
  // count years
  while (true) {
    var year = from_date.getFullYear() + 1;
    var new_date = new Date(from_date.getTime());
    new_date.setFullYear(year);
    
    if (new_date < to_date) {
      years++;
      from_date = new_date;
    } else {
      break;
    }
  }
  
  // count months
  while (true) {
    var new_date = new Date(from_date.getTime());
    
    var month = from_date.getMonth() + 1;
    if (month == 12) {
      var year = from_date.getFullYear() + 1;
      new_date.setFullYear(year);
      month = 0;
    }
    new_date.setMonth(month);
    
    if (new_date < to_date) {
      months++;
      from_date = new_date;
    } else {
      break;
    }
  }
  
  // count days
  while (true) {
    var new_date = new Date(from_date.getTime() + DAY_IN_MS);
    
    if (new_date < to_date) {
      days++;
      from_date = new_date;
    } else {
      break;
    }
  }
  
  return [years, months, days];
}