In regards to Macrodroid suggested by AZgl1500 (post #3, 02-02-2015). Nice macros and I use Macrodroid a lot. I use similar macros for weekdays, with a slight modification that has to do with notifications instead of volume. The macros are as follows:
Macro #1, I name it "Weekdays nigh time notifications on"
Trigger: Day/Time Trigger
... select weekdays: Mon, Tues, Wed, Thur, Fri
... set the time to activate the macro: 0:01 am
... press OK
Action:Set Priority Mode
... Set to "Priority"
... press OK
No constrain needed.
Macro #2, I name it "Weekdays nigh time notifications off"
Trigger: Day/Time Trigger
... select weekdays: Mon, Tues, Wed, Thur, Fri
... set the time to activate the macro: 07:30 am
... press OK
Action:Set Priority Mode
... Set to "All"
... press OK
No constrain needed.
Of course you can create similar macros for the weekend as well. The only difference would be the times you set for notifications on and off.
Works very well for me. Hope it helps.