Sydney to Colombo
-4h 30mSydney
AESTSOURCEColombo
ISTGreen rows indicate typical business hours (9 AM - 5 PM)
AEST and IST on the World Map
The map below highlights the AEST (Australian Eastern Standard Time) and IST (India Standard Time) timezone regions across the globe.
AEST – Australian Eastern Standard Time
UTC+10:00Australian Eastern Standard Time (AEST) covers eastern Australia, 10 hours ahead of UTC.
- •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.
IST – India Standard Time
UTC+05:30India Standard Time (IST) is the time zone for India and Sri Lanka, 5 hours and 30 minutes ahead of UTC.
- •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.
About Sydney
WikipediaSydney operates on Australian Eastern Standard Time (AEST/AEDT). As Australia's financial capital, Sydney opens global markets at the start of the business day.
Sydney is one of the first major cities to welcome the New Year.
About Colombo
WikipediaColombo operates on Sri Lanka Time (SLST), UTC+5:30. Sharing India's timezone, Colombo is a key South Asian trade and tourism hub.
Sri Lanka Standard Time (SLST) uses UTC+5:30, same offset as India.
Everything You Need to Know About Sydney and Colombo Time
Sydney runs on Australian Eastern Standard Time (AEST) at UTC+10:00. Colombo runs on India Standard Time (IST) at UTC+05:30. That puts Sydney 4 hours 30 minutes behind Colombo — a difference of -4h 30m at the current offsets.
In practice, when it is 9:00 AM in Sydney it is 4:30 AM in Colombo. Midnight in Sydney is 7:30 PM in Colombo. Neither zone observes daylight saving time, so the offset between them stays constant all year.
Sydney to Colombo time conversion table
| Sydney (AEST) | Colombo (IST) | Day |
|---|---|---|
| 12:00 AM | 7:30 PM | previous day |
| 6:00 AM | 1:30 AM | same day |
| 7:00 AM | 2:30 AM | same day |
| 8:00 AM | 3:30 AM | same day |
| 9:00 AM | 4:30 AM | same day |
| 12:00 PM | 7:30 AM | same day |
| 3:00 PM | 10:30 AM | same day |
| 5:00 PM | 12:30 PM | same day |
| 6:00 PM | 1:30 PM | same day |
| 9:00 PM | 4:30 PM | same day |
Why people convert Sydney to Colombo time
- Scheduling a call from Sydney to Colombo: a 10:00 AM start in Sydney lands at 5:30 AM in Colombo, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both Sydney and Colombo are inside the 9-to-5 working day between 1:30 PM and 5:00 PM AEST time (9:00 AM–12:30 PM IST). That is roughly 3 hours 30 minutes of usable overlap.
- Watching a live event or market open: Sydney viewers need 4:30 AM in Colombo to catch a 9:00 AM start there, and 4:30 AM if the event is anchored to Sydney.
- Always state the zone abbreviation, not just the hour. "3:00 PM AEST" is unambiguous; "3 PM" across a -4h 30m gap is not.
- Block 1:30 PM–5:00 PM AEST as the recurring meeting window if you work primarily from Sydney and need Colombo colleagues present.
- Sydney: Clocks spring forward on Sat, Oct 3, 2026. Re-check this page after that date because the offset changes and so does the -4h 30m gap.
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.
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 Sydney and Colombo
Both Sydney and Colombo sit inside the 9 AM – 5 PM working day between 1:30 PM–5:00 PM AEST, which is 9:00 AM–12:30 PM IST. That gives roughly 3 hours and 30 minutes of shared time — the safest window for a live call or meeting.
Business hours overlap
Sydney and Colombo overlap for about 3 hours during the working day — enough for meetings if you avoid the edges of the window.
Sydney is 4 hours 30 minutes behind Colombo (AEST UTC+10:00 → IST UTC+05:30). The shared working window is 1:30 PM–5:00 PM AEST. Remember to re-check around daylight-saving transitions.
🕐 Daylight Saving Time Info
Sydney
❄ Currently in Standard Time
Standard: UTC+10:00 · DST: UTC+11:00
Clocks spring forward on Sat, Oct 3, 2026
Colombo
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:
Frequently Asked Questions
What is the time difference between Sydney and Colombo?
Sydney (AEST, UTC+10:00) is 4 hours 30 minutes behind Colombo (IST, UTC+05:30). The gap is currently -4h 30m.
How do I convert Sydney time to Colombo time?
Add -4h 30m to Sydney local time. For example, 9:00 AM in Sydney is 4:30 AM in Colombo.
What time is it in Colombo right now?
Colombo 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 -4h 30m offset from Sydney.
What is the best time to call Colombo from Sydney?
Call between 1:30 PM and 5:00 PM AEST — that maps to 9:00 AM–12:30 PM IST and keeps both parties inside the working day.
Which is behind, Sydney or Colombo?
Sydney is 4 hours 30 minutes behind Colombo. When it is 12:00 PM in Sydney it is 7:30 AM in Colombo.
Do Sydney and Colombo use different time zones?
Sydney (Australia) uses AEST at UTC+10:00, while Colombo (Sri Lanka) uses IST at UTC+05:30. The IANA identifiers are Australia/Sydney and Asia/Colombo.
Does daylight saving time affect the Sydney–Colombo difference?
Neither zone observes daylight saving time, so the -4h 30m offset between Sydney and Colombo is fixed all year.
Which other cities share Sydney's time zone?
AEST also covers Sydney, Melbourne, Brisbane, Canberra, Hobart, Gold Coast.
Which countries use AEST, Sydney's zone?
AEST is used in Australia (NSW, VIC, QLD, TAS, ACT), Papua New Guinea.
Is there a day difference between Sydney and Colombo?
Not normally. The -4h 30m gap only pushes the date over the previous day.
What is the time difference between Sydney and Colombo?
Colombo is -4h 30m from Sydney.
What timezone is Sydney in?
Sydney operates on Australian Eastern Standard Time (AEST/AEDT). As Australia's financial capital, Sydney opens global markets at the start of the business day.
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 are the business hours in Sydney?
Standard business hours in Sydney are 9:00 AM - 5:00 PM AEST.
What are the business hours in Colombo?
Standard business hours in Colombo are 9:00 AM - 5:00 PM IST.
What is the best time to schedule a call between Sydney and Colombo?
The best overlap for a call is when both cities are in business hours. Sydney works 9:00 AM - 5:00 PM AEST and Colombo works 9:00 AM - 5:00 PM IST (-4h 30m difference). Try scheduling during the overlapping window for maximum convenience.
What currencies are used in Sydney and Colombo?
Sydney uses AUD (A$) while Colombo uses LKR (Rs). Check current exchange rates when planning travel or business between these cities.
How do Sydney and Colombo compare in size?
Sydney has a population of approximately 5.4 million (metro: 5.4 million), while Colombo has approximately 752,000 (metro: 5.6 million).
What are the major landmarks in Sydney and Colombo?
Sydney is known for Sydney Opera House, Sydney Harbour Bridge, Bondi Beach. Colombo is famous for Galle Face Green, Gangaramaya Temple, Colombo Lotus Tower.
Do Sydney and Colombo have stock exchanges?
Yes. Sydney has the ASX (Australian Securities Exchange) and Colombo has the CSE (Colombo Stock Exchange). The -4h 30m time difference affects trading hour overlaps between these exchanges.
Which countries use AEST (Australian Eastern Standard Time)?
AEST is used in Australia (NSW, VIC, QLD, TAS, ACT), Papua New Guinea.
Does AEST observe daylight saving time?
Yes, AEST switches to AEDT during summer months.
What are some interesting 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.
Which cities are in the IST timezone?
Major cities in the IST timezone include Mumbai, Delhi, Bangalore, Kolkata, Chennai, Hyderabad, Pune, Ahmedabad.
What is the UTC offset for IST?
India Standard Time (IST) is at UTC+05:30.
What should I know about the IST timezone?
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.
When is it midnight in Sydney, what time is it in Colombo?
When it is 12:00 AM (midnight) in Sydney (AEST), it is -4h 30m later in Colombo (IST).
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