deps/v8/src/js/i18n.js
function fromLDMLString(ldmlString) {
  // First remove '' quoted text, so we lose 'Uhr' strings.
  ldmlString = InternalRegExpReplace(GetQuotedStringRE(), ldmlString, '');

  var options = {};
  var match = InternalRegExpMatch(/E{3,5}/, ldmlString);
  options = appendToDateTimeObject(
      options, 'weekday', match, {EEEEE: 'narrow', EEE: 'short', EEEE: 'long'});

  match = InternalRegExpMatch(/G{3,5}/, ldmlString);
  options = appendToDateTimeObject(
      options, 'era', match, {GGGGG: 'narrow', GGG: 'short', GGGG: 'long'});

  match = InternalRegExpMatch(/y{1,2}/, ldmlString);
  options = appendToDateTimeObject(
      options, 'year', match, {y: 'numeric', yy: '2-digit'});

  match = InternalRegExpMatch(/M{1,5}/, ldmlString);
  options = appendToDateTimeObject(options, 'month', match, {MM: '2-digit',
      M: 'numeric', MMMMM: 'narrow', MMM: 'short', MMMM: 'long'});

  // Sometimes we get L instead of M for month - standalone name.
  match = InternalRegExpMatch(/L{1,5}/, ldmlString);
  options = appendToDateTimeObject(options, 'month', match, {LL: '2-digit',
      L: 'numeric', LLLLL: 'narrow', LLL: 'short', LLLL: 'long'});

  match = InternalRegExpMatch(/d{1,2}/, ldmlString);
  options = appendToDateTimeObject(
      options, 'day', match, {d: 'numeric', dd: '2-digit'});

  match = InternalRegExpMatch(/h{1,2}/, ldmlString);
  if (match !== null) {
    options['hour12'] = true;
  }
  options = appendToDateTimeObject(
      options, 'hour', match, {h: 'numeric', hh: '2-digit'});

  match = InternalRegExpMatch(/H{1,2}/, ldmlString);
  if (match !== null) {
    options['hour12'] = false;
  }
  options = appendToDateTimeObject(
      options, 'hour', match, {H: 'numeric', HH: '2-digit'});

  match = InternalRegExpMatch(/m{1,2}/, ldmlString);
  options = appendToDateTimeObject(
      options, 'minute', match, {m: 'numeric', mm: '2-digit'});

  match = InternalRegExpMatch(/s{1,2}/, ldmlString);
  options = appendToDateTimeObject(
      options, 'second', match, {s: 'numeric', ss: '2-digit'});

  match = InternalRegExpMatch(/z|zzzz/, ldmlString);
  options = appendToDateTimeObject(
      options, 'timeZoneName', match, {z: 'short', zzzz: 'long'});

  return options;
}
function fromLDMLString(ldmlString) {
  // First remove '' quoted text, so we lose 'Uhr' strings.
  ldmlString = InternalRegExpReplace(GetQuotedStringRE(), ldmlString, '');

  var options = {};
  var match = InternalRegExpMatch(/E{3,5}/, ldmlString);
  options = appendToDateTimeObject(
      options, 'weekday', match, {EEEEE: 'narrow', EEE: 'short', EEEE: 'long'});

  match = InternalRegExpMatch(/G{3,5}/, ldmlString);
  options = appendToDateTimeObject(
      options, 'era', match, {GGGGG: 'narrow', GGG: 'short', GGGG: 'long'});

  match = InternalRegExpMatch(/y{1,2}/, ldmlString);
  options = appendToDateTimeObject(
      options, 'year', match, {y: 'numeric', yy: '2-digit'});

  match = InternalRegExpMatch(/M{1,5}/, ldmlString);
  options = appendToDateTimeObject(options, 'month', match, {MM: '2-digit',
      M: 'numeric', MMMMM: 'narrow', MMM: 'short', MMMM: 'long'});

  // Sometimes we get L instead of M for month - standalone name.
  match = InternalRegExpMatch(/L{1,5}/, ldmlString);
  options = appendToDateTimeObject(options, 'month', match, {LL: '2-digit',
      L: 'numeric', LLLLL: 'narrow', LLL: 'short', LLLL: 'long'});

  match = InternalRegExpMatch(/d{1,2}/, ldmlString);
  options = appendToDateTimeObject(
      options, 'day', match, {d: 'numeric', dd: '2-digit'});

  match = InternalRegExpMatch(/h{1,2}/, ldmlString);
  if (match !== null) {
    options['hour12'] = true;
  }
  options = appendToDateTimeObject(
      options, 'hour', match, {h: 'numeric', hh: '2-digit'});

  match = InternalRegExpMatch(/H{1,2}/, ldmlString);
  if (match !== null) {
    options['hour12'] = false;
  }
  options = appendToDateTimeObject(
      options, 'hour', match, {H: 'numeric', HH: '2-digit'});

  match = InternalRegExpMatch(/m{1,2}/, ldmlString);
  options = appendToDateTimeObject(
      options, 'minute', match, {m: 'numeric', mm: '2-digit'});

  match = InternalRegExpMatch(/s{1,2}/, ldmlString);
  options = appendToDateTimeObject(
      options, 'second', match, {s: 'numeric', ss: '2-digit'});

  match = InternalRegExpMatch(/z|zzzz/, ldmlString);
  options = appendToDateTimeObject(
      options, 'timeZoneName', match, {z: 'short', zzzz: 'long'});

  return options;
}
Returns object that matches LDML representation of the date.