Does Kolkata observe daylight saving time?

No. Kolkata stays on IST (UTC+5:30) all year, so its clocks don't change.

Does Sydney observe daylight saving time?

Yes. Sydney is on AEDT (UTC+11) now, and its clocks go back 1 hour on Sun, Apr 4, 2027, to AEST (UTC+10).

What time is it in Sydney when it's 9 AM in Kolkata?

2:30 PM in Sydney, on the same day.

Kolkata to Sydney Meeting Planner

Sydney is 5 hours 30 minutes ahead of Kolkata right now. Their working days overlap for 2 hours 30 minutes today.

Kolkata · India

4:05 PM

Sat, Oct 17 · IST

Sydney · Australia

9:35 PM

Sat, Oct 17 · AEDT · summer time

Best Meeting Times Between Kolkata and Sydney

9:00 AM to 11:30 AM in Kolkata (2:30 PM to 5:00 PM in Sydney). That's when both cities are inside working hours, 9 AM to 5 PM, giving 2 hours 30 minutes of overlap today.

Who's meeting

2 of 4 places

KolkataOrganizerIndia ·4:05PMnow
SydneyAustralia ·· summer time9:35PMnow

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Add up to 4 places by city, country, time zone or abbreviation, like Tokyo, India or JST. Press "/" to jump here.

Date in Kolkata

Working hours, everywhere

Best times to meet

Saturday, October 17, 2026, in Kolkata time.

11:00AMBest · OptimalWorking hours in Kolkata (11:00) and Sydney (16:30).
10:30AMOption 2 · OptimalWorking hours in Kolkata (10:30) and Sydney (16:00).
10:00AMOption 3 · OptimalWorking hours in Kolkata (10:00) and Sydney (15:30).

The whole day

Pick any slot in the Fit row, or use the arrow keys there, to make it the meeting time.

Each column is a half hour of the first place's day. The Fit row grades how well the slot suits everyone; each row shows the local time and whether it's working hours there.
Fit
KolkataIST
SydneyAEDT
UTC	19	20	21	22	23	00	01	02	03	04	05	06	07	08	09	10	11	12	13	14	15	16	17	18

Working hours (09–17)Just outside (07–09, 17–20)Late evening (20–23)NightFit: optimal, good, possible, poor

Your meeting

Kolkata11:00 AM ISTSat, Oct 17
Sydney4:30 PM AEDTSat, Oct 17
UTC2026-10-17 05:30 UTC

What will it cost? Try the meeting cost calculator.

Time difference between Kolkata and Sydney

Sydney is 5 hours 30 minutes ahead of Kolkata right now: Sydney is on AEDT (UTC+11) and Kolkata on IST (UTC+5:30). That changes on Sun, Apr 4, 2027, when clocks go back in Sydney: then Sydney is 4 hours 30 minutes ahead of Kolkata.

Time difference between Kolkata and Sydney over the next 12 months
From	Difference	Why
Now	Sydney 5 hours 30 minutes ahead	—
Sun, Apr 4, 2027	Sydney 4 hours 30 minutes ahead	Clocks go back in Sydney
Sun, Oct 3, 2027	Sydney 5 hours 30 minutes ahead	Clocks go forward in Sydney

Kolkata is on India Standard Time. Sydney is on Australian Eastern Standard Time.

Frequently Asked Questions: Kolkata & Sydney Scheduling

What is the time difference between Kolkata and Sydney?: Sydney is 5 hours 30 minutes ahead of Kolkata right now: Sydney is on AEDT (UTC+11) and Kolkata on IST (UTC+5:30). That changes on Sun, Apr 4, 2027, when clocks go back in Sydney: then Sydney is 4 hours 30 minutes ahead of Kolkata.
What is the best time to schedule a meeting between Kolkata and Sydney?: 9:00 AM to 11:30 AM in Kolkata (2:30 PM to 5:00 PM in Sydney). That's when both cities are inside working hours, 9 AM to 5 PM, giving 2 hours 30 minutes of overlap today.
Does Kolkata observe daylight saving time?: No. Kolkata stays on IST (UTC+5:30) all year, so its clocks don't change.
Does Sydney observe daylight saving time?: Yes. Sydney is on AEDT (UTC+11) now, and its clocks go back 1 hour on Sun, Apr 4, 2027, to AEST (UTC+10).
What time is it in Sydney when it's 9 AM in Kolkata?: 2:30 PM in Sydney, on the same day.

Or see every city pair, or plan with more places in the meeting planner.