Originally Posted by Clipper801

A ticket booked on a later sailing cannot be changed to an earlier sailing on a "confirmed" basis but standby for earlier sailings based on availability is allowed at no charge.

Depending on the day of the year, the "night" sailing starts with the 5:15PM or 5:45PM or 6:15PM. I don't think anyone on a day trip from Hong Kong will return earlier than those times.