Scheduling Ringer Mode

You're too busy, you are the forgetful person, let's use this application.
Scheduling for ringer mode, which helps you not miss important calls, and help you "safe" in the meetings.
For example: you work from 8am to 5pm, during this period you have to switch to vibrate mode so as not to influence colleagues, but after 5 pm, need to switch to the bell, because at home, your mobile rarely stay right next to you. If you forget, you can miss important calls. More important, in the conference, if you forget to switch to vibrate mode, which can be a "disaster".
Is there any way to avoid this problem? let's use this application to schedule for ringer mode, and all your problems will be solved.
All questions and inquiries, please contact email: aumauduong@gmail.com