GMT to IST Converter
This GMT to IST Converter shows both Greenwich Mean Time and India Standard Time side by side with a live time difference of 5 hours 30 minutes (GMT+5:30). Use it to convert GMT to IST for scheduling cross-timezone meetings, before international flight bookings, or during remote team standups. The converter includes a time zone input field, time zone output field, time difference display, and a conversion button — all updated in real-time.
GMT Minutes Converter
Pick any specific minute in Greenwich Mean Time and see the India Standard Time result live
Time Difference
The GMT IST time difference explained with a visual offset diagram
Greenwich Mean Time
The world's baseline time standard since 1884
GMT — Greenwich Mean Time
UTC+0:00Greenwich Mean Time (GMT) is the mean solar time measured at the Royal Observatory in Greenwich, London. Since the International Meridian Conference of 1884, GMT has served as the reference point (UTC+0) from which all other time zones are offset. The Coordinated Universal Time (UTC) standard, maintained by atomic clocks worldwide, aligns with GMT for all practical time zone conversion purposes.
Countries that observe GMT include the United Kingdom (during winter months), Iceland, Portugal (mainland), and parts of West Africa such as Ghana, Ivory Coast, and Senegal. The London Time Zone switches to BST (UTC+1) during daylight saving months.
GMT Representations, Usage and Related Time Zones
Greenwich Mean Time is represented in the IANA Time Zone Database as Etc/GMT and follows the ISO 8601 Time Format notation of +00:00. GMT data is part of the TimezoneDB and WorldTimeAPI services used by developers worldwide.
India Standard Time
A single time zone covering the entire Indian subcontinent
IST — Indian Standard Time
UTC+5:30India Standard Time (IST) is the time zone used across all of India and Sri Lanka, with a fixed Time Zone Offset of UTC+5:30. India uses a single time zone for the entire country — even though the nation spans about 2,933 km (1,822 miles) from east to west, covering roughly 30° of longitude.
IST is calculated based on the 82.5°E meridian that passes near Mirzapur in Uttar Pradesh. Indian Standard Time does not observe any Daylight Saving Time (DST) transitions. For railway scheduling teams across India and for e-commerce order cutoffs, IST serves as the sole reference.
IST Representations, Usage and Related Time Zones
India Standard Time is listed in the IANA Time Zone Database as Asia/Kolkata. The ISO 8601 representation for IST is +05:30. The Google Time Zone API and Microsoft Time Zone Tool both reference this offset. Time Zone Data from TimezoneDB and Time and Date AS use the same UTC+5:30 value.
GMT to IST Chart
A full 24-hour GMT to IST time table — click any row to convert that time instantly
| GMT Time | IST Time | Period |
|---|
Convert GMT to Other Time Zones
See Greenwich Mean Time converted to popular time zones around the world — updated every second
Convert IST to Other Time Zones
See India Standard Time converted to popular time zones around the world
About This World Clock / Converter
This World Clock & Time Converter helps you convert GMT to IST online with live, second-by-second accuracy. It works as a GMT IST time converter, a time difference calculator, and a world clock — all in one page.
The tool pulls time data based on the Coordinated Universal Time (UTC) standard and calculates the Time Zone Offset for each zone automatically. No Time Zone API calls are needed — everything runs in your browser using JavaScript's built-in Date object aligned to UTC. The result display updates every second without page refreshes.
You can use this GMT to IST Converter for overlapping business hours between London and Mumbai, before global webinar starts, for cross-border project deadlines, or when scheduling medical consultations across these two time zones. The conversion works both ways — enter a GMT time to get IST, or enter IST to get GMT.
Getting Started
Convert GMT to IST in three simple steps
Select a GMT Time
Use the hour and minute sliders in the GMT Minutes Converter section above. Drag to pick any specific minute. The time zone input field accepts values from 00:00 to 23:59.
See the IST Result
The IST time zone output field updates instantly. The time difference display shows whether the converted time falls on the same day or crosses midnight into the next day.
Use the Chart
Scroll to the GMT to IST Chart for a full 24-hour breakdown. Click any row and the conversion button effect scrolls you back to the converter with that time pre-filled.
Mobile Apps
Take the GMT to IST Converter with you on any device
A Time Zone Converter App version of this tool is planned for both iOS and Android. Mobile Apps will include push notifications for cross-timezone meetings, a home screen widget showing live GMT and IST clocks, and offline conversion support for travel itinerary planning and before international flight bookings.
The mobile Time Zone Converter app will support the same time zone conversion features as this web tool — including the GMT to IST calculator, the 24-hour GMT to IST time table, and quick-convert shortcuts for popular times like 10 AM GMT to IST or 2 PM GMT to IST.
Chrome Extension
Quick GMT to IST conversion right from your browser toolbar
GMT to IST Converter — Browser Extension
A Chrome Extension for this Time Zone Conversion Tool is in development. The extension will sit in your browser toolbar and show live GMT and IST clocks. Click the icon to open a quick converter popup — no need to open a new tab. This is useful during live streaming events, before software release rollouts, or in scientific research logs where you need fast time zone conversion.
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Your Data, Our Priority
This GMT to IST Converter runs entirely in your browser. No time zone data leaves your device — zero server-side processing, zero tracking cookies, zero third-party Time Zone API calls. Your converted times and any dates you input are never stored or transmitted.
All conversion logic uses JavaScript's built-in Date object synced to Coordinated Universal Time (UTC). No external Time Zone Data sources or Time Zone Changer Software is required.