App for setting ringtone by time

[MagnusV]

I have a galaxy S3, and am looking for a way to set a ringtone during work hours and a different one for after hours.

I work at a school and cant have something inappropriate going off during work so would like it to automatically change the ringtone after 5pm or so.

Anyone know an app that might do this or a way to set it in phone?

 

[Philcoo]

I use Lama to do this, set up profiles by time and location of cell phone towers. Change ringtones + volume for different profiles in the app. Free to use as well.
Phil