Depends which standard you take. Newspapers give the arrival of the vessel at the Harbour, Government sources generally give the day passengers were allowed to disembark.
But even the newspapers can give varying dates.
Also the date used is the last port at which emigrants are disembarked, so if a vessel calls at, say, Fremantle, Adelaide, Melbourne, Sydney and Brisbane, with emigrants for all, then the date of arrival at Brisbane would be used.
I can see though that the passenger list quoted as the source, has, on the original, 5th.