HTC DESIRE 526 User Manual page 266

266 Settings and security
Setting a Do not disturb schedule
You can schedule when you want Do not disturb to turn on and how long will it last. For
example, you can set it to turn on during a weekly meeting.
1. From the Home screen, tap
2. Tap Do not disturb.
3. Tap Schedule for and select Priority or On.
4. Tap Days to set the days you want Do not disturb mode activated, and then tap
Done.
5. Set the start and the end times.
Calendar events created in your Microsoft Exchange ActiveSync account that
have Do not disturb enabled will also be listed on the Do not disturb schedule
screen.
> Settings > Sound & notification.