function dateCustomValue(elem) {
  var localizedDatabaseFormat = BKG.DateTime.localizeFormat($(elem).data('srcformat')),
    sourceDatabaseFormat = BKG.DateTime.getMomentFormat($(elem).data('srcformat')),
    sourceFormat = BKG.DateTime.getMomentFormat(localizedDatabaseFormat);
 if ($(elem).val() === '') {
   return '';
 }
  return window.moment($(elem).val(), sourceFormat).format(sourceDatabaseFormat);
}