Does it account for Daylight Saving Time?

Yes, our converter uses the IANA timezone database, which includes all current DST rules for every timezone in the world.

UTC (Coordinated Universal Time) is the primary time standard by which the world regulates clocks. All timezones are defined as offsets from UTC.

Can I compare multiple timezones at once?

Yes, you can add multiple cities or timezones and see the equivalent times side by side.

How many timezones are there in the world?

There are 38 distinct UTC offsets in use, ranging from UTC-12 to UTC+14. This includes half-hour (UTC+5:30 India, UTC+9:30 Australia) and 45-minute offsets (UTC+5:45 Nepal, UTC+8:45 Australia).

What is the International Date Line?

The International Date Line (IDL) runs roughly along the 180° meridian in the Pacific Ocean. When you cross it westward, you gain a day; crossing eastward, you lose a day.

Why do some timezones have 30 or 45 minute offsets?

Countries chose offsets that best matched their solar noon. India uses UTC+5:30 and Nepal uses UTC+5:45 because standard hourly offsets didn't align well with their geography.

Which country has the most timezones?

France has the most (12 timezones) due to overseas territories. Russia spans 11 timezones. The US has 6 (including Hawaii and Alaska).

Tokyo to Sri Lanka

-3h 30m

Tokyo

JSTSOURCE

Japan · UTC+09:00

HH12

MM00

12:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Sri Lanka

IST

UTC+05:30

HH08

MM30

08:30 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Quick Reference

Time Conversion Table

Tokyo

Sri Lanka

12:00 AM

8:30 PM-1

2:00 AM

10:30 PM-1

4:00 AM

12:30 AM

6:00 AM

2:30 AM

8:00 AM

4:30 AM

10:00 AM

6:30 AM

12:00 PM

8:30 AM

2:00 PM

10:30 AM

4:00 PM

12:30 PM

6:00 PM

2:30 PM

8:00 PM

4:30 PM

10:00 PM

6:30 PM

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

JST and IST on the World Map

The map below highlights the JST (Japan Standard Time) and IST (India Standard Time) timezone regions across the globe.

JST Zone

→

IST Zone

Explore all world timezones interactively →

JST – Japan Standard Time

UTC+09:00

Japan Standard Time (JST) is the time zone for Japan, 9 hours ahead of UTC.

Countries in JST

Japan

Major Cities in JST

TokyoOsakaYokohamaNagoyaSapporoKyotoKobeFukuokaHiroshima

Key Facts about JST

•Japan does not observe daylight saving time.
•Tokyo is the most populous metropolitan area in the world.
•The Tokyo Stock Exchange operates from 9:00 AM to 3:00 PM JST.
•JST is 14 hours ahead of EST and 9 hours ahead of GMT.

Daylight Saving:No – UTC+09:00 year-round

Learn more about JST 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

About Tokyo

Wikipedia

Tokyo operates on Japan Standard Time (JST), which is 14 hours ahead of New York. As Asia's largest financial hub, Tokyo trading hours are crucial for global markets.

Population:14 million

Metro:37.4 million

Business Hours:9:00 AM - 6:00 PM JST

Currency:JPY (¥)

Stock Exchange:TSE (Tokyo Stock Exchange)

Key Landmarks

Tokyo TowerShibuya CrossingSenso-ji TempleImperial PalaceTokyo Skytree

Did You Know?

The Tokyo subway system moves approximately 8.7 million passengers daily.

Learn more about JST timezone →

Tokyo vs Sri Lanka: Offsets, DST and Best Call Times

Tokyo runs on Japan Standard Time (JST) at UTC+09:00. Sri Lanka runs on India Standard Time (IST) at UTC+05:30. That puts Tokyo 3 hours 30 minutes behind Sri Lanka — a difference of -3h 30m at the current offsets.

In practice, when it is 9:00 AM in Tokyo it is 5:30 AM in Sri Lanka. Midnight in Tokyo is 8:30 PM in Sri Lanka. Neither zone observes daylight saving time, so the offset between them stays constant all year.

Tokyo to Sri Lanka time conversion table

Tokyo (JST)	Sri Lanka (IST)	Day
12:00 AM	8:30 PM	previous day
6:00 AM	2:30 AM	same day
7:00 AM	3:30 AM	same day
8:00 AM	4:30 AM	same day
9:00 AM	5:30 AM	same day
12:00 PM	8:30 AM	same day
3:00 PM	11:30 AM	same day
5:00 PM	1:30 PM	same day
6:00 PM	2:30 PM	same day
9:00 PM	5:30 PM	same day

Why people convert Tokyo to Sri Lanka time

Scheduling a call from Tokyo to Sri Lanka: a 10:00 AM start in Tokyo lands at 6:30 AM in Sri Lanka, so you can confirm the slot without doing the arithmetic yourself.
Finding shared working hours: both Tokyo and Sri Lanka are inside the 9-to-5 working day between 12:30 PM and 5:00 PM JST time (9:00 AM–1:30 PM IST). That is roughly 4 hours 30 minutes of usable overlap.
Keeping family and friends in sync: knowing that 8:00 PM in Tokyo is 4:30 PM in Sri Lanka makes it easy to avoid calling at 3 AM.

Always state the zone abbreviation, not just the hour. "3:00 PM JST" is unambiguous; "3 PM" across a -3h 30m gap is not.
Block 12:30 PM–5:00 PM JST as the recurring meeting window if you work primarily from Tokyo and need Sri Lanka colleagues present.

About JST (Japan Standard Time)

Japan Standard Time (JST) is the standard time zone for all of Japan. Japan does not observe daylight saving time. JST is 9 hours ahead of UTC and 14 hours ahead of EST. The Tokyo Stock Exchange, the world's third largest by market capitalization, operates on JST. South Korea uses the same offset (KST) but it is a distinct time zone.

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 Tokyo and Sri Lanka

Both Tokyo and Sri Lanka sit inside the 9 AM – 5 PM working day between 12:30 PM–5:00 PM JST, which is 9:00 AM–1:30 PM IST. That gives roughly 4 hours and 30 minutes of shared time — the safest window for a live call or meeting.

Business hours overlap

Tokyo and Sri Lanka overlap for about 4 hours during the working day — enough for meetings if you avoid the edges of the window.

Tokyo is 3 hours 30 minutes behind Sri Lanka (JST UTC+09:00 → IST UTC+05:30). The shared working window is 12:30 PM–5:00 PM JST. Remember to re-check around daylight-saving transitions.

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 Tokyo and Sri Lanka?

Tokyo (JST, UTC+09:00) is 3 hours 30 minutes behind Sri Lanka (IST, UTC+05:30). The gap is currently -3h 30m.

How do I convert Tokyo time to Sri Lanka time?

Add -3h 30m to Tokyo local time. For example, 9:00 AM in Tokyo is 5:30 AM 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 -3h 30m offset from Tokyo.

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

Call between 12:30 PM and 5:00 PM JST — that maps to 9:00 AM–1:30 PM IST and keeps both parties inside the working day.

Which is behind, Tokyo or Sri Lanka?

Tokyo is 3 hours 30 minutes behind Sri Lanka. When it is 12:00 PM in Tokyo it is 8:30 AM in Sri Lanka.

Do Tokyo and Sri Lanka use different time zones?

Tokyo (Japan) uses JST at UTC+09:00, while Sri Lanka (Sri Lanka) uses IST at UTC+05:30. The IANA identifiers are Asia/Tokyo and Asia/Colombo.

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

Neither zone observes daylight saving time, so the -3h 30m offset between Tokyo and Sri Lanka is fixed all year.

Which other cities share Tokyo's time zone?

JST also covers Tokyo, Osaka, Yokohama, Nagoya, Sapporo, Kyoto, Kobe, Fukuoka and 1 more.

Which countries use JST, Tokyo's zone?

JST is used in Japan.

Is there a day difference between Tokyo and Sri Lanka?

Not normally. The -3h 30m gap only pushes the date over the previous day.

What is the time difference between Tokyo and Sri Lanka?

Sri Lanka is -3h 30m from Tokyo.

What timezone is Tokyo in?

Tokyo operates on Japan Standard Time (JST), which is 14 hours ahead of New York. As Asia's largest financial hub, Tokyo trading hours are crucial for global markets.