code: func (id ULID) Time() uint64 {
  	return uint64(id[5]) | uint64(id[4])<<8 |
  		uint64(id[3])<<16 | uint64(id[2])<<24 |
  		uint64(id[1])<<32 | uint64(id[0])<<40
  }
docs: // Time returns the Unix time in milliseconds encoded in the ULID.
  // Use the top level Time function to convert the returned value to
  // a time.Time.