Sybase 12.5.1 User Manual page 74

hs_create_playback_session
60
end_time
specifies the date and time for the end of the recorded data to be played
back. The default is to end playback at the end of the last session
specified. Use the value NULL to accept the default.
The format of this parameter is the same as the start_time format. The
end_time, if specified, must be later than the start_time of at least one
input session.
Historical Server