getMomentDateFormat.js

/**
 * Moment.js doesn't have the particular locale-aware format string
 * that we need here, so this is an ugly workaround to derive it
 * from some related format strings that it does have.
 * https://github.com/moment/moment/issues/2505
 */
function getMomentDateFormat() {
  var localeData = moment.localeData(moment.locale()),
      llll = localeData.longDateFormat('LLLL'),
      lll = localeData.longDateFormat('LLL'),
      ll = localeData.longDateFormat('LL');
  return llll.replace(lll.replace(ll, ''), '');
}