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 Melbourne

+4h 30m

Colombo

ISTSOURCE

Sri Lanka · UTC+05:30

HH12

MM00

12:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Melbourne

AEST

Australia · UTC+10:00DST observed

HH04

MM30

16:30 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Quick Reference

Time Conversion Table

Colombo

Melbourne

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)

IST and AEST on the World Map

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

IST Zone

→

AEST 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

AEST – Australian Eastern Standard Time

UTC+10:00

Australian Eastern Standard Time (AEST) covers eastern Australia, 10 hours ahead of UTC.

Countries in AEST

Australia (NSW, VIC, QLD, TAS, ACT)Papua New Guinea

Major Cities in AEST

SydneyMelbourneBrisbaneCanberraHobartGold Coast

Key Facts about AEST

•Queensland does not observe daylight saving time, staying on AEST year-round.
•Sydney and Melbourne switch to AEDT (UTC+11:00) in summer.
•The Australian Securities Exchange (ASX) operates on AEST/AEDT.
•AEST is 15 hours ahead of EST during winter.

Daylight Saving:Yes – switches to AEDT

Learn more about AEST 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 →

About Melbourne

Wikipedia

Melbourne operates on Australian Eastern Time (AEST/AEDT). As Australia's second-largest city, Melbourne shares business hours with Sydney and the ASX.

Population:5.1 million

Metro:5.1 million

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

Currency:AUD (A$)

Stock Exchange:ASX (Australian Securities Exchange)

Key Landmarks

Federation SquareMelbourne Cricket GroundRoyal Botanic GardensFlinders Street StationGreat Ocean Road

Did You Know?

Melbourne was the capital of Australia from 1901 to 1927.

Learn more about AEST timezone →

Colombo vs Melbourne: Offsets, DST and Best Call Times

Colombo runs on India Standard Time (IST) at UTC+05:30. Melbourne runs on Australian Eastern Standard Time (AEST) at UTC+10:00. That puts Colombo 4 hours 30 minutes ahead of Melbourne — a difference of +4h 30m at the current offsets.

In practice, when it is 9:00 AM in Colombo it is 1:30 PM in Melbourne. Midnight in Colombo is 4:30 AM in Melbourne. Neither zone observes daylight saving time, so the offset between them stays constant all year.

Colombo to Melbourne time conversion table

Colombo (IST)	Melbourne (AEST)	Day
12:00 AM	4:30 AM	same day
6:00 AM	10:30 AM	same day
7:00 AM	11:30 AM	same day
8:00 AM	12:30 PM	same day
9:00 AM	1:30 PM	same day
12:00 PM	4:30 PM	same day
3:00 PM	7:30 PM	same day
5:00 PM	9:30 PM	same day
6:00 PM	10:30 PM	same day
9:00 PM	1:30 AM	next day

Why people convert Colombo to Melbourne time

Scheduling a call from Colombo to Melbourne: a 10:00 AM start in Colombo lands at 2:30 PM in Melbourne, so you can confirm the slot without doing the arithmetic yourself.
Finding shared working hours: both Colombo and Melbourne are inside the 9-to-5 working day between 9:00 AM and 12:30 PM IST time (1:30 PM–5:00 PM AEST). That is roughly 3 hours 30 minutes of usable overlap.
Watching a live event or market open: Colombo viewers need 1:30 PM in Melbourne to catch a 9:00 AM start there, and 7:30 PM 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 +4h 30m gap is not.
Block 9:00 AM–12:30 PM IST as the recurring meeting window if you work primarily from Colombo and need Melbourne colleagues present.
Melbourne: Clocks spring forward on Sat, Oct 3, 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 AEST (Australian Eastern Standard Time)

Australian Eastern Standard Time (AEST) is used in the eastern states of Australia including New South Wales, Victoria, Queensland, Tasmania, and the ACT. During summer (October to April), NSW, VIC, TAS, and ACT switch to Australian Eastern Daylight Time (AEDT, UTC+11:00), while Queensland remains on AEST year-round.

Best time to call between Colombo and Melbourne

Both Colombo and Melbourne sit inside the 9 AM – 5 PM working day between 9:00 AM–12:30 PM IST, which is 1:30 PM–5:00 PM AEST. That gives roughly 3 hours and 30 minutes of shared time — the safest window for a live call or meeting.

Business hours overlap

Colombo and Melbourne overlap for about 3 hours during the working day — enough for meetings if you avoid the edges of the window.

Colombo is 4 hours 30 minutes ahead of Melbourne (IST UTC+05:30 → AEST UTC+10:00). The shared working window is 9:00 AM–12:30 PM IST. Remember to re-check around daylight-saving transitions.

🕐 Daylight Saving Time Info

Colombo

Does not observe DST

Melbourne

❄ Currently in Standard Time

Standard: UTC+10:00 · DST: UTC+11:00

Clocks spring forward on Sat, Oct 3, 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 Melbourne?

Colombo (IST, UTC+05:30) is 4 hours 30 minutes ahead of Melbourne (AEST, UTC+10:00). The gap is currently +4h 30m.

How do I convert Colombo time to Melbourne time?

Add +4h 30m to Colombo local time. For example, 9:00 AM in Colombo is 1:30 PM in Melbourne.

What time is it in Melbourne right now?

Melbourne uses AEST at UTC+10:00. Use the live converter at the top of this page — it updates in real time and already accounts for the +4h 30m offset from Colombo.

What is the best time to call Melbourne from Colombo?

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

Which is ahead, Colombo or Melbourne?

Colombo is 4 hours 30 minutes ahead of Melbourne. When it is 12:00 PM in Colombo it is 4:30 PM in Melbourne.

Do Colombo and Melbourne use different time zones?

Colombo (Sri Lanka) uses IST at UTC+05:30, while Melbourne (Australia) uses AEST at UTC+10:00. The IANA identifiers are Asia/Colombo and Australia/Melbourne.

Does daylight saving time affect the Colombo–Melbourne difference?

Neither zone observes daylight saving time, so the +4h 30m offset between Colombo and Melbourne is fixed all year.

Which other cities share Colombo's time zone?

IST also covers Mumbai, Delhi, Bangalore, Kolkata, Chennai, Hyderabad, Pune, Ahmedabad and 4 more.

Which countries use IST, Colombo's zone?

IST is used in India, Sri Lanka.

Is there a day difference between Colombo and Melbourne?

Not normally. The +4h 30m gap only pushes the date over for late-evening times.

What is the time difference between Colombo and Melbourne?

Melbourne is +4h 30m from Colombo.

What timezone is Colombo in?

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

What timezone is Melbourne in?

Melbourne operates on Australian Eastern Time (AEST/AEDT). As Australia's second-largest city, Melbourne shares business hours with Sydney and the ASX.

What are the business hours in Colombo?

Standard business hours in Colombo are 9:00 AM - 5:00 PM IST.

What are the business hours in Melbourne?

Standard business hours in Melbourne are 9:00 AM - 5:00 PM AEST.

What is the best time to schedule a call between Colombo and Melbourne?

The best overlap for a call is when both cities are in business hours. Colombo works 9:00 AM - 5:00 PM IST and Melbourne works 9:00 AM - 5:00 PM AEST (+4h 30m difference). Try scheduling during the overlapping window for maximum convenience.

What currencies are used in Colombo and Melbourne?

Colombo uses LKR (Rs) while Melbourne uses AUD (A$). Check current exchange rates when planning travel or business between these cities.

How do Colombo and Melbourne compare in size?

Colombo has a population of approximately 752,000 (metro: 5.6 million), while Melbourne has approximately 5.1 million (metro: 5.1 million).

What are the major landmarks in Colombo and Melbourne?

Colombo is known for Galle Face Green, Gangaramaya Temple, Colombo Lotus Tower. Melbourne is famous for Federation Square, Melbourne Cricket Ground, Royal Botanic Gardens.

Do Colombo and Melbourne have stock exchanges?

Yes. Colombo has the CSE (Colombo Stock Exchange) and Melbourne has the ASX (Australian Securities Exchange). The +4h 30m time difference affects trading hour overlaps between these exchanges.