Moment Date Length Checker

date_dropdown.html

<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.10.1/moment.js"></script>
<script>
  var langs = [
    'en',
    'de',
    'es',
    'fr',
    'fr-ca',
    'id',
    'tr',
    'ru',
    'zh-cn',
    'zh-tw',
    'pt-br',
    'pt'
  ];

  langs.forEach(function(lang) {
    var shortDateFormats = {
      'en': 'ddd, mmmm d',
      'de': 'ddd, [der] d mmmm',
      'es': 'ddd, d [de] mmmm',
      'fr': 'ddd, [le] d mmmm',
      'fr-ca': 'ddd, [le] d mmmm',
      'id': 'ddd, mmmm d',
      'tr': 'dd mmmm',
      'ru': 'ddd, d mmmm',
      'zh-cn': 'mmm d, ddd',
      'zh-tw': 'mmm d, ddd',
      'pt-br': 'ddd, d [de] mmmm',
      'pt': 'ddd, d [de] mmmm'
    };

    var shortLanguageFormat = shortDateFormats[lang] ? shortDateFormats[lang] : shortDateFormats['en'];

    moment.locale(lang, {
      longDateFormat: {
        'l': shortLanguageFormat,
      }
    });

    console.log('------' + lang + '-------');
    console.log(moment().format('l'));
  });
</script>