Get week bounds from a date

week_bounds.js

/*
 * Usage:
 * new Date().weekBounds()
 * 
 * or 
 * 
 * weekBounds(new Date());
 */
 
function weekBounds(date) {
  var ONE_DAY = 1000 * 60 * 60 * 24;

  var d1 = new Date(date.getTime() - (date.getDay() * ONE_DAY));
  d1.setHours(0, 0, 0, 0);

  var d2 = new Date(date.getTime() + (6 - date.getDay()) * ONE_DAY);
  d2.setHours(23, 59, 59, 999);

  return [d1, d2];
}

Date.prototype.weekBounds = function() {
  return weekBounds(this);
}