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IST to GMT Time Converter

Use this IST to GMT time converter to compare India and United Kingdom time instantly. GMT is 5 hours and 30 minutes behind IST, so 9:00 AM IST becomes 3:30 AM GMT and 5:00 PM IST becomes 11:30 AM GMT. The page is useful for business-hours overlap, international calls, remote-team handoffs, webinars, and travel planning, with daylight saving adjustments handled automatically.

IST India Standard Time
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GMT Greenwich Mean Time
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Select a time to convert

IST to GMT Quick Facts

Use this IST to GMT converter to compare India and United Kingdom time, check the 5 hours and 30 minutes gap, and confirm the right slot for calls, handoffs, and deadlines. Good overlap starts around 3:00 PM IST / 9:30 AM GMT.

Time Difference
Greenwich Mean Time is 5 hours and 30 minutes behind India Standard Time
Useful when deadlines, handoffs, or calls cross workday boundaries.
Best Call Window
Best overlap starts around 3:00 PM IST and 9:30 AM GMT.
Common Use Cases
Useful for remote teams, customer support windows, travel planning, webinars, and same-day deadline handoffs.

How to Convert IST to GMT

Converting between India Standard Time and Greenwich Mean Time means accounting for a 5 hours and 30 minutes gap — here's how to do it in under 10 seconds with no sign-up.

Enter Your IST Time

Pick the date and time in India Standard Time (UTC +5:30) that you want to convert. Hit "Now" to load the current IST time instantly, or use "+1h" to step forward and compare.

Read the GMT Result

The equivalent Greenwich Mean Time (UTC +0) time appears immediately. Since GMT is 5 hours and 30 minutes behind of IST, most daytime conversions stay on the same calendar day.

Copy or Fine-Tune

Click "Copy Time" to grab the GMT result for your calendar or message. Use "+1d" to check how the conversion shifts across dates — useful when Daylight Saving Time changes the gap.

Why Choose Our IST to GMT Converter

Align IST–GMT Meetings Instantly

When someone in India suggests 3:00 PM IST, that's 9:30 AM GMT. This converter shows the overlap so both sides agree on one slot — no back-and-forth.

Spot Date-Line Shifts at a Glance

Late-night IST times can land on a different date in GMT because of the 5 hours and 30 minutes offset. The converter labels "next day" or "previous day" next to the result so you never send a message a day early or miss a deadline.

Handles DST Transitions Automatically

The half-hour offset between IST (UTC +5:30) and GMT (UTC +0) already makes mental math tricky — add Daylight Saving Time and the gap can shift further. This converter uses live UTC offsets, so you're always accurate.

Never Miss a IST-Timed Event

Product launches, sports matches, and webinars are often announced in IST. Convert the event time to GMT so you know exactly when to tune in — with a 5 hours and 30 minutes difference, a morning event in India falls during work hours in Universal.

IST to GMT Time Conversion Chart

Quick-reference conversion table covering every hour of the day at a glance.

Complete 24-Hour Conversion

India Standard Time to Greenwich Mean Time full day schedule

12:00 AM
IST
→
6:30 PM
GMT
(previous day)
1:00 AM
IST
→
7:30 PM
GMT
(previous day)
2:00 AM
IST
→
8:30 PM
GMT
(previous day)
3:00 AM
IST
→
9:30 PM
GMT
(previous day)
4:00 AM
IST
→
10:30 PM
GMT
(previous day)
5:00 AM
IST
→
11:30 PM
GMT
(previous day)
6:00 AM
IST
→
12:30 AM
GMT
7:00 AM
IST
→
1:30 AM
GMT
8:00 AM
IST
→
2:30 AM
GMT
9:00 AM
IST
→
3:30 AM
GMT
10:00 AM
IST
→
4:30 AM
GMT
11:00 AM
IST
→
5:30 AM
GMT
12:00 PM
IST
→
6:30 AM
GMT
1:00 PM
IST
→
7:30 AM
GMT
2:00 PM
IST
→
8:30 AM
GMT
3:00 PM
IST
→
9:30 AM
GMT
4:00 PM
IST
→
10:30 AM
GMT
5:00 PM
IST
→
11:30 AM
GMT
6:00 PM
IST
→
12:30 PM
GMT
7:00 PM
IST
→
1:30 PM
GMT
8:00 PM
IST
→
2:30 PM
GMT
9:00 PM
IST
→
3:30 PM
GMT
10:00 PM
IST
→
4:30 PM
GMT
11:00 PM
IST
→
5:30 PM
GMT
Business-hours overlap

India to UK — reverse of the London-Bengaluru corridor

Same 5.5 h gap (4.5 h in summer). IST-lead meetings scheduling UK counterparts work best 2-4 PM IST (8:30-10:30 AM GMT, early UK morning). Late-IST calls (6-8 PM IST = 12:30-2:30 PM GMT) hit UK working lunch — culturally fine but avoid the 1-2 PM slot which is genuinely lunch. Weekend note: India's Sat-Sun mostly aligns with UK Sat-Sun, but Indian corporate holidays (Republic Day, Independence Day, Diwali) don't map to anything on the UK calendar.

The two zones in context

IST vs GMT — cities and working rhythm

IST — India Standard Time
Primary cities: Mumbai, Delhi, Bengaluru, Hyderabad, Chennai, Kolkata

Indian business hours run 10 AM – 7 PM IST typically; IT / BPO shifts commonly extend to cover US and UK working hours, so 3:30 PM – 12:30 AM IST (US overlap) and 12:30 PM – 9 PM IST (UK overlap) are the two second shifts you see most often. Weekend is Saturday-Sunday for most private-sector employers.

GMT — Greenwich Mean Time
Primary cities: London, Dublin, Lisbon, Accra, Reykjavík

UK / Ireland / Iceland / Portugal / West Africa. Business hours 9 AM – 5:30 PM GMT typically. Note: London is on GMT in winter, BST (GMT+1) in summer — but "GMT" gets used loosely all year in scheduling contexts. Financial-services London anchors the European trading day.

Time gap: GMT is 5.5 hours behind IST (standard-time offsets — daylight-saving flips shift this by an hour twice a year in most northern-hemisphere zones).

IST to GMT Time Difference, Business Hours, and DST

IST to GMT is one of the more useful timezone conversions for calls, deadlines, and travel planning. The current gap is 5 hours and 30 minutes, which means 9:00 AM IST becomes 3:30 AM GMT and 2:00 PM IST becomes 8:30 AM GMT.

This matters when teams in Mumbai and London need to align business hours, webinars, or customer-support coverage. Use the chart on this page when you want the exact conversion for today instead of relying on manual offset math.

Daylight saving changes can also shift the gap during the year, so a converter is safer than memorizing a fixed difference. That is especially important for recurring meetings and date-sensitive handoffs.

IST to GMT FAQ

Quick answers about daylight saving time, date changes, business-hour overlap, and the most common scheduling questions between India Standard Time and Greenwich Mean Time.

What is the time difference between IST and GMT?

GMT is 5 hours 30 minutes behind IST. IST is UTC +5:30 and GMT is UTC +0:00 relative to UTC. Neither IST nor GMT observes daylight saving time, so the 5 hours 30 minutes gap stays constant all year. That makes scheduling between them predictable.

When can IST and GMT have business-hour overlap?

Aim for 14:00–17:00 IST, which is 09:00–12:00 GMT. Both sides stay inside standard business hours.

Does IST or GMT observe daylight saving time?

Neither IST nor GMT observes daylight saving time, so the 5 hours 30 minutes gap stays constant all year. That makes scheduling between them predictable.

How do I quickly convert IST to GMT?

To convert IST to GMT, add 5 hours 30 minutes subtract from the IST time. Example: if it's 10:00 AM IST, it's 05:00 GMT that day. The live converter at the top of this page handles DST automatically.

Why is GMT↔IST important for UK business?

UK companies with Indian operations (banking, IT services, consulting) coordinate across this 5.5-hour gap. Indian engineers finish their day exactly as UK teams start theirs — classic "follow the sun" handoff.

What does the GMT-IST handoff window look like?

IST 4:00-6:00 PM = GMT 10:30 AM-12:30 PM. India hands off afternoon work to UK morning. This is the standard end-of-day-IST → start-of-day-GMT pattern used by 24-hour operations.

Does the GMT-IST gap shift?

Yes, by one hour. UK observes BST (UTC+1) from late March to late October. During BST the gap is 4.5 hours; during GMT it's 5.5 hours. India never changes.

Popular IST Time Converters

Explore more IST conversions for major business and travel corridors. Each page includes a 24-hour chart, time difference summary, and meeting overlap guidance.

Convert Other Time Zones to GMT

Find the time difference from any major zone into Greenwich Mean Time. Use these pages when scheduling with Universal from a different region.

🌍 Swap direction — GMT to IST Converter