The Difference in Time Between Kolkata and London is

a) Kolkata is more than 5 hours ahead

The time difference between Kolkata (India) and London (United Kingdom) is a result of their locations in different time zones and the effect of daylight saving in the UK. India operates on a single time zone, Indian Standard Time (IST), while the UK operates on Greenwich Mean Time (GMT) or British Summer Time (BST), depending on the season.

Why is There a Time Difference Between Kolkata and London?

The Earth is divided into 24 time zones, each representing 15 degrees of longitude, with each zone differing by approximately 1 hour from its neighbor. As India lies much further east than the UK, the sun rises and sets earlier in Kolkata compared to London. This east-west difference is the fundamental reason behind the time gap.

Additionally, India’s position at UTC+5:30 and the UK’s position at UTC+0 (or UTC+1 in summer) directly translates to the time difference between the two cities. The half-hour offset in India’s time zone is also unique, as most time zones are based on whole-hour increments. This peculiarity is often a point of interest in geography and general studies.

Time Zone of Kolkata (IST – Indian Standard Time)

Kolkata, like the rest of India, follows Indian Standard Time (IST), which is UTC+5:30. This means that the time in Kolkata is 5 hours and 30 minutes ahead of Coordinated Universal Time (UTC). India does not observe daylight saving time, which means IST remains the same throughout the year.

The IST meridian is based on 82.5° East longitude, which passes near Mirzapur in Uttar Pradesh. Even though Kolkata lies further east than this meridian, the entire country uses IST uniformly. For school students and competitive exam aspirants, it’s important to note that all Indian cities, including Kolkata, follow the same time zone without seasonal changes.

Time Zone of London (GMT/BST – United Kingdom Time)

London operates on Greenwich Mean Time (GMT) during the winter and switches to British Summer Time (BST), which is GMT+1, in the summer months. Daylight saving typically begins in March and ends in October, advancing the clock by one hour to make better use of daylight.

This change impacts the time difference between Kolkata and London. During winter (when London follows GMT), Kolkata is 5 hours and 30 minutes ahead of London. However, during summer (when London shifts to BST), Kolkata becomes only 4 hours and 30 minutes ahead. Understanding these variations is essential for accurate international scheduling, especially in business, aviation, and broadcasting.

Quick Facts on Time Difference Between Kolkata and London

• Kolkata follows IST (UTC+5:30)
• London follows GMT (UTC+0) in winter and BST (UTC+1) in summer
• Kolkata is 5 hours 30 minutes ahead of London in winter
• Kolkata is 4 hours 30 minutes ahead of London in summer
• India does not observe daylight saving time

Summary

Question: The Difference in Time Between Kolkata and London is
Answer: Kolkata is more than 5 hours ahead of London.
The time difference between Kolkata and London is a clear example of how geography influences our daily lives. Based on time zones and seasonal changes, Kolkata is either 5 hours 30 minutes or 4 hours 30 minutes ahead of London. This knowledge is not only useful for academic purposes but also critical for global communication, scheduling, and understanding international affairs. For students, mastering time zones equips them with a key concept in both geography and general awareness.

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