Time Difference: Kolkata vs Sydney
Kolkata
12:12:08 PM IST
Thursday, May 14, 2026
4h 30m
4h 30m
Sydney
4:42:08 PM AEST
Thursday, May 14, 2026
Sydney is 4.5 hours ahead of Kolkata.
Quick Reference
- Kolkata
- IST (GMT+5:30)
No Daylight Saving Time
- Sydney
- AEST (GMT+10)
AEDT starts on Oct 3, 2026
Frequently Asked Questions
- What is the time difference between Kolkata and Sydney?
- Sydney is 4.5 hours ahead of Kolkata.
- When is the best time to call from Kolkata to Sydney?
- The best time to call is during overlapping business hours (9 AM – 5 PM) in both cities. Use the interactive converter on this page to visually compare hours side by side.
- Does the time difference change with daylight saving time?
- The time difference may change when either city enters or exits daylight saving time. Kolkata uses IST and Sydney uses AEST.