const moment = require('moment');

const defaultUtcOffset = moment().utcOffset();

const layer = {
  ANSIC: 'ddd MMM D  HH:mm:ss YYYY',
  UnixDate: 'ddd MMM  D HH:mm:ss z YYYY',
  RubyDate: 'ddd MMM D HH:mm:ss ZZ YYYY',
  RFC822: 'ddd MMM D HH:mm:ss ZZ YYYY z',
  RFC822Z: 'D MMM YY HH:mm ZZ',
  RFC850: 'dddd, DD-MMM-YY HH:mm:ss z',
  RFC1123: 'ddd, DD MMM YY HH:mm:ss z',
  RFC1123Z: 'ddd, DD MMM YY HH:mm:ss ZZ',
  RFC3339: 'YYYY-MM-DDTHH:mm:SSZ',
  RFC3339Nano: 'YYYY-MM-DDTHH:mm.SSSSSS:SSZ',
  Kitchen: 'h:mA',
  Stamp: 'MMM  D HH:mm:ss',
  StampMilli: 'MMM  D HH:mm:ss.SSS',
  StampMicro: 'MMM  D HH:mm:ss.SSSSSS',
  StampNano: 'MMM  D HH:mm:ss.SSSSSSSSS',
  ISO8601: 'YYYY-MM-DDTHH:mm:ss ZZ',
  ISO8601Z: 'YYYY-MM-DDTHH:mm:ss\\Z',
  ISODate: 'YYYY-MM-DD',
  ISOOrigin: 'YYYY-DDD',
  ISOTime: 'HH:mm:ss',
  ISOWeek: 'YYYY-\\Www',
  ISOWeekDay: 'YYYY-\\Www-d',
  SlashedDate: 'MM/DD/YYYY',
  StrfTimeClock: 'HH:mm',
  StrfTimeISODate: 'YYYY-MM-DD',
  StrfTimeKitchen: 'H:MM:SS A',
  StrfTimeShortdate: 'D-MMM-YYYY',
  UTC: 'ddd, DD MMM YYYY HH:mm:ss z'
};

for (let rfc in layer) {
  const tmp = layer[rfc];
  let utcOffset = tmp === layer.ISO8601Z ? 0 : defaultUtcOffset;
  console.log(
    moment()
      .utcOffset(utcOffset)
      .format(tmp)
  );
}