The demand for two time zones in India has been a topic of discussion for many years. India follows a single time system called Indian Standard Time (IST), but due to its large size and geographical differences, many experts believe that one time zone is not enough.

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In 2018, the Council of Scientific and Industrial Research through its lab National Physical Laboratory suggested that India should consider having two time zones. This idea became important because people living in the northeastern part of the country face problems due to early sunrise and sunset.

What is a Time Zone?

A time zone is a region where the same standard time is used. The idea of time zones was introduced by Sir Sandford Fleming in 1879.

Later, in the International Meridian Conference, the world was divided into 24 time zones.

Why do we have time zones?

The Earth rotates on its axis.
It takes 24 hours to complete one rotation.
Every 15 degrees of longitude represents 1 hour difference.

So, the entire world is divided into 24 time zones to manage time properly.

Indian Standard Time (IST)

India follows a single time zone called Indian Standard Time (IST).

Key Facts about IST

Based on longitude: 82.5° East
Passes through Mirzapur in Uttar Pradesh
IST = UTC + 5 hours 30 minutes
Maintained by National Physical Laboratory
Uses atomic clocks for accurate time

History of Time Zones in India

During British rule, India had three different time zones:

Bombay Time
Calcutta Time
Madras Time

After independence, in 1906, India adopted a single time zone (IST) for simplicity and unity.

Why is There a Demand for Two Time Zones in India?

1. Large Geographical Size

India stretches from Gujarat in the west to Arunachal Pradesh in the east, covering almost 30 degrees of longitude. This is a large distance, enough to have more than one time zone.

Countries like the United States and Russia have multiple time zones because of their large size.

2. Early Sunrise in Northeast India

In northeastern states like Assam and Arunachal Pradesh:

The sun rises as early as 4 AM in summer
But offices open at 10 AM (IST)

This leads to wastage of daylight. People lose productive morning hours.

3. Effect on Daily Life (Circadian Rhythm)

The human body follows a natural clock called the Circadian Rhythm.

This controls:

Sleep
Wake-up time
Eating habits

When the official time does not match sunlight, people feel:

Tired
Less productive
Less efficient

4. Special Case of Northeast India

People in Northeast India have long demanded a separate time zone because:

They start their day early
They lose daylight due to late office timings
Their lifestyle is different from the rest of India

Interestingly, tea gardens in Assam follow their own local time called “Chaibagaan Time”, which is one hour ahead of IST.

Suggestions for Two Time Zones

The National Physical Laboratory proposed two time zones:

Proposed Time Zones

Time Zone	Area Covered	Longitude Range
IST-I	Most of India	68°E to 89°E
IST-II	Northeast India	89°E to 97°E

Difference between both: 1 hour

Advantages of Having Two Time Zones

1. Better Productivity

People can work according to sunlight:

Early sunrise = early start
Better use of daylight

This improves efficiency in offices, schools, and daily life.

2. Energy Saving

Using daylight properly can save electricity.

Estimated savings: 2.7 billion units per year
Money saved: around ₹1000 crore

Less electricity use also reduces pollution.

3. Environmental Benefits

Lower energy consumption means:

Reduced carbon emissions
Better climate protection

This helps India fight climate change.

4. Social Benefits

Two time zones can help:

Reduce road accidents
Improve women’s safety
Promote healthier lifestyles

People will sleep and wake at proper times.

Disadvantages of Two Time Zones

1. Confusion in Travel and Transport

India has a large railway network.

Different time zones may cause confusion
Risk of accidents if not managed properly

2. Problems in Daily Coordination

Banks, offices, and businesses may face timing issues
People traveling between zones must adjust clocks

3. Border Confusion

At the boundary of two time zones:

People may get confused
Frequent time changes can create problems

4. Political and Social Concerns

Some fear that:

Two time zones may create division
Northeast may feel separated from the rest of India

5. Infrastructure Cost

To implement two time zones:

New systems are needed
Another time-keeping lab must be set up

This increases cost.

Alternatives to Two Time Zones

1. Shifting IST by 30 Minutes

The National Institute of Advanced Studies suggested:

Move IST ahead by 30 minutes
New time: UTC + 6:00

Benefits:

Better daylight use
Energy saving
Simpler than two time zones

2. Daylight Saving Time (DST)

DST means:

Move clocks forward in summer
Move back in winter

Benefits:

More daylight in evening
Energy saving
Boost tourism

However, India currently does not follow DST.

Time Zones Around the World

Countries with Multiple Time Zones

United States – 9 time zones
Russia – 11 time zones

Countries with Single Time Zone

China follows one time zone despite large size

Special Case: France

France has 12 time zones (due to overseas territories)

Understanding Time Standards

UTC vs GMT

UTC (Coordinated Universal Time): Modern standard using atomic clocks
GMT (Greenwich Mean Time): Based on the sun at Royal Observatory Greenwich

Time Zones in Extreme Regions

Poles

No fixed time zones
Scientists use convenient time

Space

Astronauts on the International Space Station follow GMT

Way Forward

India needs careful planning before making any change.

Important steps:

Study economic and social impact
Analyze sunlight patterns
Consult people from Northeast India
Ensure smooth transport systems

The government must make a balanced decision that improves productivity without creating confusion.

FAQs

1. Why does India have only one time zone?

India adopted one time zone after independence to maintain unity and simplify administration.

2. Which part of India needs a different time zone?

Northeast India, especially states like Assam and Arunachal Pradesh.

3. What is IST based on?

IST is based on 82.5° East longitude passing through Mirzapur.

4. What is circadian rhythm?

It is the body’s natural clock that controls sleep and daily activities.

5. What is the main benefit of two time zones?

Better use of daylight, increased productivity, and energy saving.

6. What is “Chaibagaan Time”?

It is a local time followed in Assam tea gardens, one hour ahead of IST.

7. What is the alternative to two time zones?

Shifting IST by 30 minutes or using Daylight Saving Time.