How to Restrict BedTime Marker not to move beyond 0 ? Any Hack ?

[Renganatha Arunachalam]

I am using this slider to implement 24 hours clock.

I want to make sure that BedTime Marker doesn't move beyond 0 deg and Wake time does move beyond 360 deg

which means both the markers should move between 0 to 360

Any Hack or work around ?