The match sale periods change periodically to the next status when the 'Status End' date is reached. See below for the order of change.
Home matches: Members - Online Sale - General Sale
Away matches: Season Ticket Holders - Members - Processing period - General Sale.
For example; if an away game is on sale to Season Ticket Holders and that status ends 30 March, Members will be able to buy tickets on and from the 30 March.