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.

IST to Sydney

+4h 30m

IST

ISTSOURCE

UTC+05:30

HH12

MM00

12:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Sydney

AEST

Australia · UTC+10:00DST observed

HH04

MM30

16:30 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Quick Reference

Time Conversion Table

IST

Sydney

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 Sydney

Wikipedia

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.

Population:5.4 million

Metro:5.4 million

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

Currency:AUD (A$)

Stock Exchange:ASX (Australian Securities Exchange)

Key Landmarks

Sydney Opera HouseSydney Harbour BridgeBondi BeachDarling HarbourRoyal Botanic Garden

Did You Know?

Sydney is one of the first major cities to welcome the New Year.

Learn more about AEST timezone →

IST vs Sydney: Offsets, DST and Best Call Times

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

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

IST to Sydney time conversion table

IST (IST)	Sydney (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 IST to Sydney time

Scheduling a call from IST to Sydney: a 10:00 AM start in IST lands at 2:30 PM in Sydney, so you can confirm the slot without doing the arithmetic yourself.
Finding shared working hours: both IST and Sydney 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.
Coordinating a IST-based team with Sydney contacts: quoting times in the other side's local clock — not your own — removes the single biggest source of missed meetings.

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 IST and need Sydney colleagues present.
Sydney: 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 IST and Sydney

Both IST and Sydney 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

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

IST is 4 hours 30 minutes ahead of Sydney (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

IST

Does not observe DST

Sydney

❄ 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 IST and Sydney?

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

How do I convert IST time to Sydney time?

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

What time is it in Sydney right now?

Sydney 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 IST.

What is the best time to call Sydney from IST?

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, IST or Sydney?

IST is 4 hours 30 minutes ahead of Sydney. When it is 12:00 PM in IST it is 4:30 PM in Sydney.

Do IST and Sydney use different time zones?

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

Does daylight saving time affect the IST–Sydney difference?

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

Which other cities share IST's time zone?

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

Which countries use IST, IST's zone?

IST is used in India, Sri Lanka.

Is there a day difference between IST and Sydney?

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

What is the time difference between IST and Sydney?

Sydney is +4h 30m from IST.

What timezone is IST in?

IST operates on its local timezone.

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.