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).

Colombo to Bucharest

-2h 30m

Colombo

ISTSOURCE

Sri Lanka · UTC+05:30

HH12

MM00

12:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Bucharest

EEST

Romania · UTC+03:00☀ DST active

HH09

MM30

09:30 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Quick Reference

Time Conversion Table

Colombo

Bucharest

12:00 AM

9:30 PM-1

2:00 AM

11:30 PM-1

4:00 AM

1:30 AM

6:00 AM

3:30 AM

8:00 AM

5:30 AM

10:00 AM

7:30 AM

12:00 PM

9:30 AM

2:00 PM

11:30 AM

4:00 PM

1:30 PM

6:00 PM

3:30 PM

8:00 PM

5:30 PM

10:00 PM

7:30 PM

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

IST and EEST on the World Map

The map below highlights the IST (India Standard Time) and EEST (Eastern European Time) timezone regions across the globe.

IST Zone

→

EEST Zone

Explore all world timezones interactively →

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

EET – Eastern European Time

UTC+02:00

Eastern European Time (EET) is used in Eastern Europe, the Middle East, and northeastern Africa, 2 hours ahead of UTC.

Countries in EET

FinlandGreeceRomaniaBulgariaUkraineEgyptIsraelLebanonJordanLithuaniaLatviaEstoniaMoldovaLibyaSyriaPalestineCyprus

Major Cities in EET

CairoAthensHelsinkiBucharestKyivSofiaJerusalemTel AvivBeirutVilniusRigaTallinn

Key Facts about EET

•EET covers countries across three continents: Europe, Asia, and Africa.
•Cairo is the most populous city in the EET zone.
•Turkey used to be on EET but permanently moved to UTC+03:00 in 2016.
•Finland, the Baltic states, and Greece all use EET.

Daylight Saving:Yes – switches to EEST

Learn more about EET on Wikipedia

About Colombo

Wikipedia

Colombo operates on Sri Lanka Time (SLST), UTC+5:30. Sharing India's timezone, Colombo is a key South Asian trade and tourism hub.

Population:752,000

Metro:5.6 million

Business Hours:9:00 AM - 5:00 PM IST

Currency:LKR (Rs)

Stock Exchange:CSE (Colombo Stock Exchange)

Key Landmarks

Galle Face GreenGangaramaya TempleColombo Lotus TowerIndependence SquareDutch Hospital

Did You Know?

Sri Lanka Standard Time (SLST) uses UTC+5:30, same offset as India.

Learn more about IST timezone →

Colombo vs Bucharest: Offsets, DST and Best Call Times

Colombo runs on India Standard Time (IST) at UTC+05:30. Bucharest runs on Eastern European Summer Time (EEST) at UTC+03:00, also currently on daylight saving time. That puts Colombo 2 hours 30 minutes behind Bucharest — a difference of -2h 30m at the current offsets.

In practice, when it is 9:00 AM in Colombo it is 6:30 AM in Bucharest. Midnight in Colombo is 9:30 PM in Bucharest.Bucharest observes daylight saving time while Colombo does not, so the gap narrows or widens by an hour part of the year.

Colombo to Bucharest time conversion table

Colombo (IST)	Bucharest (EEST)	Day
12:00 AM	9:30 PM	previous day
6:00 AM	3:30 AM	same day
7:00 AM	4:30 AM	same day
8:00 AM	5:30 AM	same day
9:00 AM	6:30 AM	same day
12:00 PM	9:30 AM	same day
3:00 PM	12:30 PM	same day
5:00 PM	2:30 PM	same day
6:00 PM	3:30 PM	same day
9:00 PM	6:30 PM	same day

Why people convert Colombo to Bucharest time

Scheduling a call from Colombo to Bucharest: a 10:00 AM start in Colombo lands at 7:30 AM in Bucharest, so you can confirm the slot without doing the arithmetic yourself.
Finding shared working hours: both Colombo and Bucharest are inside the 9-to-5 working day between 11:30 AM and 5:00 PM IST time (9:00 AM–2:30 PM EEST). That is roughly 5 hours 30 minutes of usable overlap.
Watching a live event or market open: Colombo viewers need 6:30 AM in Bucharest to catch a 9:00 AM start there, and 2:30 AM if the event is anchored to Colombo.

Always state the zone abbreviation, not just the hour. "3:00 PM IST" is unambiguous; "3 PM" across a -2h 30m gap is not.
Block 11:30 AM–5:00 PM IST as the recurring meeting window if you work primarily from Colombo and need Bucharest colleagues present.
Bucharest: Clocks fall back on Sun, Oct 25, 2026. Any meeting series spanning that date will shift by an hour in local time.

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.

About EET (Eastern European Time)

Eastern European Time (EET) covers a wide geographical area including Eastern Europe (Finland, Greece, Romania, Bulgaria, Ukraine), the Middle East (Israel, Lebanon, Jordan), and northeastern Africa (Egypt, Libya). During summer, most EET countries switch to Eastern European Summer Time (EEST, UTC+03:00). Turkey permanently moved to UTC+03:00 in 2016, effectively leaving EET.

Best time to call between Colombo and Bucharest

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

Business hours overlap

Colombo and Bucharest share 5 hours of working-hours overlap (11:30 AM–5:00 PM IST), so scheduling a live meeting is straightforward.

Colombo is 2 hours 30 minutes behind Bucharest (IST UTC+05:30 → EEST UTC+03:00). The shared working window is 11:30 AM–5:00 PM IST. Remember to re-check around daylight-saving transitions.

🕐 Daylight Saving Time Info

Colombo

Does not observe DST

Bucharest

☀ Currently in DST

Standard: UTC+02:00 · DST: UTC+03:00

Clocks fall back on Sun, Oct 25, 2026

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 Colombo and Bucharest?

Colombo (IST, UTC+05:30) is 2 hours 30 minutes behind Bucharest (EEST, UTC+03:00). The gap is currently -2h 30m.

How do I convert Colombo time to Bucharest time?

Add -2h 30m to Colombo local time. For example, 9:00 AM in Colombo is 6:30 AM in Bucharest.

What time is it in Bucharest right now?

Bucharest uses EEST at UTC+03:00. Use the live converter at the top of this page — it updates in real time and already accounts for the -2h 30m offset from Colombo.

What is the best time to call Bucharest from Colombo?

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

Which is behind, Colombo or Bucharest?

Colombo is 2 hours 30 minutes behind Bucharest. When it is 12:00 PM in Colombo it is 9:30 AM in Bucharest.

Do Colombo and Bucharest use different time zones?

Colombo (Sri Lanka) uses IST at UTC+05:30, while Bucharest (Romania) uses EEST at UTC+03:00. The IANA identifiers are Asia/Colombo and Europe/Bucharest.

Does daylight saving time affect the Colombo–Bucharest difference?

Yes at the moment: Bucharest is on daylight saving time and Colombo is not, so the -2h 30m gap shifts by an hour when exactly one of them changes clocks.