Does it handle Daylight Saving Time?

Yes, the tool automatically adjusts for Daylight Saving Time based on the specific date you select, ensuring accurate conversions year-round.

Can I add multiple cities?

Yes, you can add as many cities as you need to the dashboard to compare times across your entire global network simultaneously.

GMT to Sri Lanka

+5h 30m

GMT

GMTSOURCE

UTC+01:00☀ DST active

HH12

MM00

12:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Sri Lanka

IST

UTC+05:30

HH05

MM30

17:30 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Quick Reference

Time Conversion Table

GMT

Sri Lanka

12:00 AM

4:30 AM

2:00 AM

6:30 AM

4:00 AM

8:30 AM

6:00 AM

10:30 AM

8:00 AM

12:30 PM

10:00 AM

2:30 PM

12:00 PM

4:30 PM

2:00 PM

6:30 PM

4:00 PM

8:30 PM

6:00 PM

10:30 PM

8:00 PM

12:30 AM+1

10:00 PM

2:30 AM+1

Green rows indicate typical business hours (9 AM - 5 PM)

GMT and IST on the World Map

The map below highlights the GMT (Greenwich Mean Time) and IST (India Standard Time) timezone regions across the globe.

GMT Zone

→

IST Zone

Explore all world timezones interactively →

GMT – Greenwich Mean Time

UTC+00:00

Greenwich Mean Time (GMT) is the mean solar time at the Royal Observatory in Greenwich, London. It is the same as UTC+00:00.

Countries in GMT

United KingdomIrelandIcelandPortugal (mainland)GhanaSenegalMaliMauritaniaGambiaGuineaSierra LeoneLiberiaIvory CoastBurkina FasoMorocco (historically)

Major Cities in GMT

LondonDublinLisbonAccraReykjavikEdinburghCasablancaDakarBamakoAbidjanConakryFreetownMonrovia

Key Facts about GMT

•GMT is based on the Prime Meridian (0° longitude) passing through Greenwich, London.
•The Royal Observatory in Greenwich has been the reference point for GMT since 1884.
•GMT and UTC are often used interchangeably, but UTC is based on atomic clocks.
•Iceland uses GMT year-round and never observes daylight saving time.
•The UK switches from GMT to BST (British Summer Time) in late March each year.

Daylight Saving:Yes – switches to BST

Learn more about GMT on Wikipedia

IST – India Standard Time

UTC+05:30

India Standard Time (IST) is the time zone for India and Sri Lanka, 5 hours and 30 minutes ahead of UTC.

Countries in IST

IndiaSri Lanka

Major Cities in IST

MumbaiDelhiBangaloreKolkataChennaiHyderabadPuneAhmedabadColomboJaipurLucknowSurat

Key Facts about IST

•India is 10 hours 30 minutes ahead of EST and 5 hours 30 minutes ahead of GMT.
•India uses a single time zone despite spanning 30° of longitude.
•IST is one of only a handful of time zones with a 30-minute offset.
•IST is the most populous single time zone in the world with over 1.4 billion people.
•The Bombay Stock Exchange (BSE) and National Stock Exchange (NSE) operate on IST.

Daylight Saving:No – UTC+05:30 year-round

Learn more about IST on Wikipedia

Understanding the +5h 30m Gap: GMT vs Sri Lanka

GMT runs on Greenwich Mean Time (GMT) at UTC+00:00. Sri Lanka runs on India Standard Time (IST) at UTC+05:30. That puts GMT 5 hours 30 minutes ahead of Sri Lanka — a difference of +5h 30m at the current offsets.

In practice, when it is 9:00 AM in GMT it is 2:30 PM in Sri Lanka. Midnight in GMT is 5:30 AM in Sri Lanka. Neither zone observes daylight saving time, so the offset between them stays constant all year.

GMT to Sri Lanka time conversion table

GMT (GMT)	Sri Lanka (IST)	Day
12:00 AM	5:30 AM	same day
6:00 AM	11:30 AM	same day
7:00 AM	12:30 PM	same day
8:00 AM	1:30 PM	same day
9:00 AM	2:30 PM	same day
12:00 PM	5:30 PM	same day
3:00 PM	8:30 PM	same day
5:00 PM	10:30 PM	same day
6:00 PM	11:30 PM	same day
9:00 PM	2:30 AM	next day

Why people convert GMT to Sri Lanka time

Scheduling a call from GMT to Sri Lanka: a 10:00 AM start in GMT lands at 3:30 PM in Sri Lanka, so you can confirm the slot without doing the arithmetic yourself.
Finding shared working hours: both GMT and Sri Lanka are inside the 9-to-5 working day between 9:00 AM and 11:30 AM GMT time (2:30 PM–5:00 PM IST). That is roughly 2 hours 30 minutes of usable overlap.
Keeping family and friends in sync: knowing that 8:00 PM in GMT is 1:30 AM in Sri Lanka makes it easy to avoid calling at 3 AM.

Always state the zone abbreviation, not just the hour. "3:00 PM GMT" is unambiguous; "3 PM" across a +5h 30m gap is not.
Block 9:00 AM–11:30 AM GMT as the recurring meeting window if you work primarily from GMT and need Sri Lanka colleagues present.

About GMT (Greenwich Mean Time)

Greenwich Mean Time (GMT) is the clock time at the Royal Observatory in Greenwich, London, which sits on the Prime Meridian (0° longitude). GMT serves as the reference point from which all other time zones are calculated. The United Kingdom uses GMT during winter months and switches to British Summer Time (BST, UTC+01:00) from late March to late October. Several West African nations use GMT year-round. GMT is often used interchangeably with UTC (Coordinated Universal Time), although technically they are different – UTC is based on atomic clocks while GMT is based on Earth's rotation.

About IST (India Standard Time)

India Standard Time (IST) is the time observed throughout India and Sri Lanka. It is based on the 82.5°E meridian, passing through Mirzapur in Uttar Pradesh. India uses a single time zone despite spanning roughly 30° of longitude, which has been debated. IST does not observe daylight saving time. India is the world's most populous country, making IST one of the most-used time zones globally. The IT outsourcing industry and call centers operate primarily on IST, making the EST-to-IST conversion one of the most searched timezone conversions.

Best time to call between GMT and Sri Lanka

Both GMT and Sri Lanka sit inside the 9 AM – 5 PM working day between 9:00 AM–11:30 AM GMT, which is 2:30 PM–5:00 PM IST. That gives roughly 2 hours and 30 minutes of shared time — the safest window for a live call or meeting.

Business hours overlap

GMT and Sri Lanka overlap for about 2 hours during the working day — enough for meetings if you avoid the edges of the window.

GMT is 5 hours 30 minutes ahead of Sri Lanka (GMT UTC+00:00 → IST UTC+05:30). The shared working window is 9:00 AM–11:30 AM GMT. Remember to re-check around daylight-saving transitions.

🕐 Daylight Saving Time Info

GMT

☀ Currently in DST

Standard: UTC+00:00 · DST: UTC+01:00

Clocks fall back on Sun, Oct 25, 2026

Sri Lanka

Does not observe DST

Learn More About Time

Dive deeper into the fascinating world of timekeeping, time zones, and how they shape our global society:

⏳

History of Timekeeping

From sundials to atomic clocks - 5000 years of measuring time

🌍

How Time Zones Work

UTC, offsets, and why zones don't follow straight lines

☀️

Daylight Saving Time

DST dates, which countries observe it, and the ongoing debate

Frequently Asked Questions

What is the time difference between GMT and Sri Lanka?

GMT (GMT, UTC+00:00) is 5 hours 30 minutes ahead of Sri Lanka (IST, UTC+05:30). The gap is currently +5h 30m.

How do I convert GMT time to Sri Lanka time?

Add +5h 30m to GMT local time. For example, 9:00 AM in GMT is 2:30 PM in Sri Lanka.

What time is it in Sri Lanka right now?

Sri Lanka uses IST at UTC+05:30. Use the live converter at the top of this page — it updates in real time and already accounts for the +5h 30m offset from GMT.

What is the best time to call Sri Lanka from GMT?

Call between 9:00 AM and 11:30 AM GMT — that maps to 2:30 PM–5:00 PM IST and keeps both parties inside the working day.

Which is ahead, GMT or Sri Lanka?

GMT is 5 hours 30 minutes ahead of Sri Lanka. When it is 12:00 PM in GMT it is 5:30 PM in Sri Lanka.

Do GMT and Sri Lanka use different time zones?

GMT uses GMT at UTC+00:00, while Sri Lanka (Sri Lanka) uses IST at UTC+05:30. The IANA identifiers are Europe/London and Asia/Colombo.

Does daylight saving time affect the GMT–Sri Lanka difference?

Neither zone observes daylight saving time, so the +5h 30m offset between GMT and Sri Lanka is fixed all year.

Which other cities share GMT's time zone?

GMT also covers London, Dublin, Lisbon, Accra, Reykjavik, Edinburgh, Casablanca, Dakar and 5 more.

Which countries use GMT, GMT's zone?

GMT is used in United Kingdom, Ireland, Iceland, Portugal (mainland), Ghana, Senegal, Mali, Mauritania and 7 more.

Is there a day difference between GMT and Sri Lanka?

Not normally. The +5h 30m gap only pushes the date over for late-evening times.

What is the time difference between GMT and Sri Lanka?

Sri Lanka is +5h 30m from GMT.

What timezone is GMT in?

GMT operates on its local timezone.

What timezone is Sri Lanka in?

Sri Lanka operates on its local timezone.

Which countries use GMT (Greenwich Mean Time)?

GMT is used in United Kingdom, Ireland, Iceland, Portugal (mainland), Ghana, Senegal, and 9 more countries.

Does GMT observe daylight saving time?

Yes, GMT switches to BST during summer months.

What are some interesting facts about GMT?

GMT is based on the Prime Meridian (0° longitude) passing through Greenwich, London. The Royal Observatory in Greenwich has been the reference point for GMT since 1884.