Question
Download Solution PDFHow much is the difference between Indian Standard Time (IST) and Greenwich Mean Time (GMT)?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFThe correct answer is \( +5\frac{1}{2}h\).
Key Points
- Indian Standard Time (IST) is 5 hours 30 minutes ahead of Greenwich Mean Time (GMT).
- Standard time is the local time of a particular region or a country.
- In India, the longitude of 82.5° E is treated as the Standard Meridian which we all know as Indian Standard Time.
- The Prime Meridian is a 0° and is known as the Greenwich line as it passes through Greenwich near London, where the British Royal Observatory is located.
Important Points
- Difference Between GMT and IST
| Greenwich Mean Time (GMT) | Indian Standard Time (IST) |
| GMT is calculated on the basis of 0 degree longitude. | IST is calculated on the basis of 82.5 degree longitude. |
| GMT is common for the entire World. | Indian Standard Time is used in India and Sri Lanka. |
| GMT was established in 1675 by the Royal Observatory to help navigators at sea. | IST was established in India in 1947 |
Last updated on Jul 14, 2025
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