Why India celebrates Teachers' Day on 5th September and others on 5th October

One such occasion that both students and teachers look forward to is Teachers' Day. India has been commemorating Teachers' Day since 1962, whereas UNESCO has been celebrating World Teachers' Day since 1994.

Why India celebrate teachers day on 5th September and all others on 5th October

A day like Teachers' Day is one such event that is equally anticipated by students and teachers. Teachers' Day has been celebrated in India since 1962, meanwhile, World Teachers' Day is celebrated by UNESCO since 1994.  

Why does the world celebrate Teachers' Day on 5th October and India on 5th September?