GMT to IST Converter

Category: Time Zone Converters

- June 17, 2025

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Greenwich Mean Time (GMT)

UTC+0 • London, Dublin, Accra

Conversion Settings

Configure your timezone conversion preferences

Auto Convert

Daylight Saving Aware

Show UTC Offset

India Standard Time (IST)

UTC+5:30 • Mumbai, Delhi, Bangalore

--:--:--

Select a time to convert

Time Difference: --

UTC Offset (GMT): +00:00

UTC Offset (IST): +05:30

DST Status: --

GMT/BST Time: --

IST Time: --

Time Format:

Current GMT: --:--:--

Current IST: --:--:--

🌍 GMT changes to BST (UTC+1) during daylight saving. IST is always UTC+5:30 with no daylight saving changes.

GMT to IST Conversion Guide

What is GMT to IST Conversion?

GMT to IST conversion helps you translate time between Greenwich Mean Time and India Standard Time zones. GMT is UTC+0 in winter and becomes BST (UTC+1) during daylight saving time from March to October. IST is always UTC+5:30 and never changes for daylight saving time.

Time Zone Information

Greenwich Mean Time (GMT): Used in the UK, Ireland, and several African countries including London, Dublin, and Accra. UTC+0 in winter, becomes BST (UTC+1) during daylight saving.

India Standard Time (IST): Used throughout India including Mumbai, Delhi, Bangalore, and Kolkata. Always UTC+5:30 with no daylight saving time adjustments.

Time Difference: IST is typically 5 hours and 30 minutes ahead of GMT, or 4 hours and 30 minutes ahead of BST during daylight saving time.

Daylight Saving Time Impact

Winter Period (GMT): October to March - IST is 5 hours 30 minutes ahead of GMT

Summer Period (BST): March to October - IST is 4 hours 30 minutes ahead of BST

India Time: No daylight saving time changes - always UTC+5:30 year-round

Common Conversion Examples

Business Hours (Winter)

GMT 9:00 AM → IST 2:30 PM

GMT 5:00 PM → IST 10:30 PM

5 hours 30 minutes time difference during GMT period

Business Hours (Summer)

BST 9:00 AM → IST 1:30 PM

BST 5:00 PM → IST 9:30 PM

4 hours 30 minutes time difference during BST period

Meeting Planning

Best GMT Time: 9:00 AM - 12:30 PM

Converts to IST: 2:30 PM - 6:00 PM

Optimal for both business hours

Event Scheduling

GMT Midnight: 5:30 AM IST

GMT Noon: 5:30 PM IST

Perfect for UK-India coordination

Conversion Tips & Best Practices

• Always check if UK time is observing GMT or BST when scheduling

• IST doesn't change - it's always 5 hours 30 minutes ahead of UTC throughout the year

• Business meetings work best when GMT is morning hours (9 AM-12:30 PM) for IST afternoon

• India uses a half-hour offset, making it unique among major time zones

• Use 24-hour format to avoid AM/PM confusion when scheduling internationally

• GMT transitions to BST on the last Sunday in March at 1:00 AM

Convert GMT and IST

Built for anyone juggling between London and India

If you’ve ever tried setting up a meeting between teams in London and Mumbai, you’ve likely done timezone math in your head—or worse, Googled it five times. This calculator makes those moments disappear. Whether you’re dealing with winter GMT or summer BST, and no matter which side of the world you’re on, it does the work for you. Just enter your time, click once, and see the conversion with full context.

Why this tool is more than a simple time converter

Most converters spit out a number. This one tells a story: it shows the time difference, daylight saving status, UTC offsets, and both formatted clocks side by side. You’re not left guessing if London is in British Summer Time, or whether IST changed (spoiler: it never does). If you need to explain timezones to a teammate, this is the kind of tool that answers their follow-up questions before they ask.

How to convert time between GMT/BST and IST

Step-by-step to get your answer fast

Pick the base timezone using the dropdown. Start with either GMT/BST or IST as your input.
Enter the date and time you want to convert. That’s it - just those two fields.
Click the “Convert Time” button. You’ll see the converted time instantly appear on the other side.

Prefer live input? Use auto convert

Enable “Auto Convert” and the result will update automatically as soon as you adjust the time or date—no button needed.

Show full details (if you want them)

There are checkboxes for extra info:

Daylight Saving Aware: On by default. This means the calculator checks whether the date you entered falls during British Summer Time.
Show UTC Offset: Adds or hides the UTC+0 / +5:30 display for both timezones.

This gives you more than just a number - it gives you context.

Swapping timezones? That’s one click

Use the “Swap” button to flip which timezone is your input and which is your output. All labels and data update instantly, so you’re never left second-guessing what you’re looking at.

Shortcut keys for fast conversions

If you’re the keyboard type, you’ll appreciate these built-in shortcuts:

Space: Convert the current time
S: Swap timezones
N: Set the input time to “Now”
R: Reset all fields
F: Toggle between 12-hour and 24-hour display

No menus to dig through—just quick actions to get back to your day.

What else shows up when you convert?

Each conversion gives you more than just the translated time. You’ll also see:

The full date in a readable format (“Mon, Jun 17, 2025” style)
Whether GMT is currently observing BST (it changes in March and October)
The exact time difference in hours
Both times, clearly labeled and formatted

These extras make it easy to double-check your scheduling - especially if you're setting something for the future, when daylight saving might change.

Live clocks keep you grounded

At the bottom of the tool, you'll find live GMT and IST clocks updating every second. They're perfect for a quick glance if you're working across timezones throughout the day. And if you're wondering, yes—you can switch between 12-hour and 24-hour views with one tap.

Stay in sync without second-guessing

Whether you're scheduling with colleagues, coordinating events, or just want to avoid “Wait, what time is that for me?”, this GMT to IST calculator keeps things clear. It’s flexible, accurate, and easy enough for anyone to use. Save yourself the headache of timezone math - this tool keeps everyone on the same page, no matter the clock.