phpjs/experimental/datetime/date_format.js

php.js offers community built php functions in javascript

function date_format(obj, format) {
  // http://kevin.vanzonneveld.net
  // +   original by: Brett Zamir (http://brett-zamir.me)
  // -    depends on: date() (and an object passed in which was created by the DateTime class--e.g., date_create)
  // Note: finished but basically useless until date_create() is implemented
  return this.date(format, obj.getTimestamp());
}