The self-lodgement tax deadline falls on 31 October every year, closing the four-month window that opened on 1 July. 7 October 2028 falls inside October, the final month of that window, in the fourth calendar quarter of 2028, with the deadline drawing closer as the month progresses.
A public holiday that falls on a Saturday sits inside the weekend rather than beside it, so it does not automatically create a substitute day off during the working week; whether one applies depends on the specific holiday and the state. Saturday 7 October 2028 falls on this day of the week, inside the weekend itself.
A public holiday that falls on a Monday or a Friday produces a three-day weekend without using any annual leave, which is why long-weekend planning around 7 October 2028 depends on which day of the week the nearest public holiday falls on. A midweek holiday delivers no such automatic extension, though many workers bridge it with a single day of leave.