dateString = function (ms) {
  if (isNaN(ms)) { return 'Invalid date'; }
  const format = /* showMs ? 'YYYY/MM/DD HH:mm:ss.SSS z' : */ 'YYYY/MM/DD HH:mm:ss z';
  return moment.tz(ms, 'utc').format(format);
}
Parses ms date to string

@example
'{{ 1524680821 | dateString }}'
this.$options.filters.dateString(1524680821);

@returns {string} - Our common date string display