if setting a recurring task for 4 weeks or more, then the time activity time is displayed as 23:59
eg. creating a task as such "every 4 weeks starting 26 Oct @ 09:00"
When you enter the time and date of the task, you need to enter the Time and then the Date; in your example, try entering [every 4 weeks at 09:00 starting 23 nov] (if you were to use '26 oct' after 09:00 today it would default to 26 oct 2014!).