Question

why do we consider indian standards time rather then world time​

Answer 1

According to convention, each time zone in the world is spaced by 15 degrees longitude. Hence, India could have two time zones. However, the government chooses to keep a single time zone across the whole country (similar to China), despite various requests and proposals to change it.

hope it helps

Answer 2

The world time or GST is not used in other countries except England coz there is 5 and 1/2 hrs of time delay for india.

if sun rises there ,it will take 11:30 for sun to reach India. the sun rising is in the early morning not during noon