Time in Kolkata vs Sydney
Kolkata keeps IST (UTC+5:30) and Sydney keeps AEST (UTC+10) today. Sydney is 4½ hours ahead of Kolkata; the rows below read both clocks live.
The working day, side by side
Hours shaded in both rows are inside working hours in both cities: 14:00–18:00 in Sydney (09:00–13:00 your time).
| City | 00:00 in Kolkata | 01:00 in Kolkata | 02:00 in Kolkata | 03:00 in Kolkata | 04:00 in Kolkata | 05:00 in Kolkata | 06:00 in Kolkata | 07:00 in Kolkata | 08:00 in Kolkata | 09:00 in Kolkata | 10:00 in Kolkata | 11:00 in Kolkata | 12:00 in Kolkata | 13:00 in Kolkata | 14:00 in Kolkata | 15:00 in Kolkata | 16:00 in Kolkata | 17:00 in Kolkata | 18:00 in Kolkata | 19:00 in Kolkata | 20:00 in Kolkata | 21:00 in Kolkata | 22:00 in Kolkata | 23:00 in Kolkata |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Kolkata—— | 00 | 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 |
| Sydney—— | 00 | 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 |
- Working hours
- Shoulder
- Night
- Overlap
Do more with Kolkata and Sydney
Best hours to call
Where daylight saving pulls them apart
Sydney next changes on Sunday 4 October 2026. Between those two dates the gap between the cities is an hour different from the one shown above — which is exactly when a recurring meeting drifts. Every date we track is on the daylight saving page.
Also useful
Common questions
How many hours ahead is Sydney of Kolkata?
Sydney is 4½ hours ahead of Kolkata right now. The gap is not fixed: it moves whenever either side changes its clocks.
What is the best time to call between Kolkata and Sydney?
Any hour in 09:00–13:00 Kolkata time is inside working hours in both cities.
Do Kolkata and Sydney change clocks on the same date?
Only one of them does, so the gap between them changes twice a year even though neither city moved relative to the sun.