Why Does India Have a Separate Time Zone From Nepal?

India and Nepal share a long international border but their clocks do not show the same time. Nepal is 15 minutes ahead of India. India follows Indian Standard Time (IST). This means that when it is 10:00 AM in India, it is 10:15 AM in Nepal.  But why do two neighbouring countries have different time zones? Keep reading to know in detail. 

Why Does India Have a Separate Time Zone From Nepal?

India and Nepal have separate time zones because each country has adopted its own standard time based on a chosen reference longitude. India follows Indian Standard Time (IST). Nepal follows Nepal Time (NPT). India’s standard time is UTC+5:30. Nepal’s standard time is UTC+5:45. Nepal is therefore 15 minutes ahead of India.

What Is the Time Difference Between India and Nepal?

The official time difference between the two countries is 15 minutes.

Simple Example

Why Does India Use UTC+5:30?

India follows a single national time zone called Indian Standard Time (IST). IST is based on the 82.5° East longitude which is used as India’s standard meridian. India is geographically wide from east to west.

Why Does Nepal Use UTC+5:45?

Nepal follows Nepal Time (NPT), which is 5 hours and 45 minutes ahead of UTC. Nepal chose its own national standard time rather than following Indian Standard Time. Its official time is UTC+5:45.

What Is a Standard Meridian?

A standard meridian is a selected longitude used to determine a country standard time. The Earth rotates from west to east which means places located at different longitudes experience solar noon at different times. Instead of every city using its own local solar time, countries generally choose a standard meridian.

Why Is Nepal 15 Minutes Ahead of India?

Nepal is ahead of India because its official time is UTC+5:45, while India’s official time is UTC+5:30. The calculation is simple UTC+5:45 - UTC+5:30=15 minutes Therefore, Nepal Time = Indian Standard Time + 15 minutes.

India vs Nepal Time Zone