GMT to IST Converter

GMT is 5 hours 30 minutes behind IST. For example, 10:00 AM GMT is 3:30 PM IST. GMT and IST use fixed offsets, so this difference remains the same year-round.

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GMT to IST Hour Conversion Table

Find overlap hours between London and Kolkata.

Standard table note: The table below uses the fixed abbreviations in this page title: GMT = UTC +0 and IST = UTC +5:30. The live clocks and converter use Europe/London and Asia/Kolkata, so they automatically reflect daylight saving time when either location changes clocks. In London, GMT (UTC +0) applies from the last Sunday in October to the last Sunday in March; from the last Sunday in March to the last Sunday in October, the live zone uses BST (UTC +1). IST is a fixed UTC +5:30 offset for this page's conversion table.

Current GMT --:--:-- ---
Current IST --:--:-- ---
Calculating time zone difference...
Source (GMT)Target (IST)Availability
12:00 AM 5:30 AM Off-Hours
1:00 AM 6:30 AM Off-Hours
2:00 AM 7:30 AM Off-Hours
3:00 AM 8:30 AM Off-Hours
4:00 AM 9:30 AM Partial Overlap
5:00 AM 10:30 AM Partial Overlap
6:00 AM 11:30 AM Partial Overlap
7:00 AM 12:30 PM Partial Overlap
8:00 AM 1:30 PM Partial Overlap
9:00 AM 2:30 PM Perfect Overlap
10:00 AM 3:30 PM Perfect Overlap
11:00 AM 4:30 PM Perfect Overlap
12:00 PM 5:30 PM Perfect Overlap
1:00 PM 6:30 PM Partial Overlap
2:00 PM 7:30 PM Partial Overlap
3:00 PM 8:30 PM Partial Overlap
4:00 PM 9:30 PM Partial Overlap
5:00 PM 10:30 PM Partial Overlap
6:00 PM 11:30 PM Off-Hours
7:00 PM 12:30 AM (+1d) Off-Hours
8:00 PM 1:30 AM (+1d) Off-Hours
9:00 PM 2:30 AM (+1d) Off-Hours
10:00 PM 3:30 AM (+1d) Off-Hours
11:00 PM 4:30 AM (+1d) Off-Hours

Common GMT to IST Conversions

Quick reference table using fixed GMT and IST offsets. Use the live converter above for the exact current city time when daylight saving is active.

9:00 AM GMT equals 2:30 PM IST
12:00 PM GMT equals 5:30 PM IST
3:00 PM GMT equals 8:30 PM IST
6:00 PM GMT equals 11:30 PM IST
9:00 PM GMT equals 2:30 AM (+1d) IST

Popular Time Zone Conversions

Compare other popular time zone combinations related to GMT and IST.

Related Guides & Tools

Read our deep dives and use other timezone mapping tools to simplify your scheduling.

How to Convert GMT to IST

Add 5 hours 30 minutes to Greenwich Mean Time (GMT) to get India Standard Time (IST). For example, 9:00 AM GMT is 2:30 PM IST and 3:00 PM GMT is 8:30 PM IST. GMT is UTC+0 and IST is UTC+5:30, so their fixed time difference does not change. If you mean current United Kingdom local time, remember that the UK uses BST (UTC+1) during summer.

GMT to IST Frequently Asked Questions

What is the time difference between GMT and IST?

India Standard Time is 5 hours 30 minutes ahead of Greenwich Mean Time. To convert GMT to IST, add 5 hours 30 minutes.

Why is India Standard Time offset by half an hour?

India Standard Time uses UTC+5:30 as one standard time for the country. The half-hour offset places India's national time between the neighboring whole-hour UTC offsets.

What are the best meeting hours between GMT and India?

A practical overlap is 9:00 AM to 11:30 AM GMT, which corresponds to 2:30 PM to 5:00 PM IST.

Do GMT and IST observe daylight saving time?

No. GMT remains UTC+0 and IST remains UTC+5:30 throughout the year. The United Kingdom changes from GMT to British Summer Time, but GMT itself does not change.

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