Sydney zone
GMT+10 (GMT+10)
Kolkata zone
GMT+5:30 (GMT+5:30)
Difference
4h 30m behind Sydney
Business overlap
3h (9-5 windows)
Working hours overlap
Each cell is one hour in Sydney. Filled cells mark when 9 AM – 5 PM in Sydney and Kolkata both apply.
3 hours per day
- Sydney
- GMT+10
- Kolkata
- GMT+5:30
- Difference
- -4h 30m
- Business overlap
- 3h
Hour-by-hour conversion
Each row shows the matching local time in Kolkata for an hour in Sydney.
| Sydney | Kolkata | Day | Window |
|---|---|---|---|
| 12:00 AM | 7:30 PM | previous day | — |
| 1:00 AM | 8:30 PM | previous day | — |
| 2:00 AM | 9:30 PM | previous day | — |
| 3:00 AM | 10:30 PM | previous day | — |
| 4:00 AM | 11:30 PM | previous day | — |
| 5:00 AM | 12:30 AM | same 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 | — |
| 10:00 AM | 5:30 AM | same day | — |
| 11:00 AM | 6:30 AM | same day | — |
| 12:00 PM | 7:30 AM | same day | — |
| 1:00 PM | 8:30 AM | same day | — |
| 2:00 PM | 9:30 AM | same day | Both 9-5 |
| 3:00 PM | 10:30 AM | same day | Both 9-5 |
| 4:00 PM | 11:30 AM | same day | Both 9-5 |
| 5:00 PM | 12:30 PM | same day | — |
| 6:00 PM | 1:30 PM | same day | — |
| 7:00 PM | 2:30 PM | same day | — |
| 8:00 PM | 3:30 PM | same day | — |
| 9:00 PM | 4:30 PM | same day | — |
| 10:00 PM | 5:30 PM | same day | — |
| 11:00 PM | 6:30 PM | same day | — |
Best meeting windows
If both teams keep standard 9 AM – 5 PM hours, the overlap window is roughly 2:00 PM – 5:00 PM in Sydney time. That gives you 3 hours per workday for live meetings.
Tighter overlap is achievable by having the side with later working hours start earlier, or by treating the first and last hours of each side as flexible. The bar above marks every hour where both cities sit inside a 9 AM – 5 PM window.
About converting Sydney time to Kolkata time
Sydney follows the Australia/Sydney time zone (currently GMT+10, GMT+10), while Kolkata follows Asia/Kolkata (currently GMT+5:30, GMT+5:30). Kolkata is 4h 30m behind Sydney right now.
Sydney observes daylight saving time, while Kolkata does not. The offset between the two cities changes by one hour at the daylight saving transitions.
Daylight saving transitions in 2026
Sydney
- Fall back · Sunday, April 5, 2026
- Spring forward · Sunday, October 4, 2026
Kolkata
Does not observe daylight saving time.
Reverse this conversion
Kolkata to Sydney
Open the converter
Plan a meeting between Sydney and Kolkata
More conversions from Sydney
Frequently asked questions
- How many hours is Sydney from Kolkata?
- Kolkata is 4h 30m behind Sydney right now.
- What time is 9:00 AM Sydney in Kolkata?
- 9:00 AM in Sydney is 4:30 AM in Kolkata.
- What time is 5:00 PM Sydney in Kolkata?
- 5:00 PM in Sydney is 12:30 PM in Kolkata.
- When do Sydney and Kolkata business hours overlap?
- Standard 9 AM - 5 PM working hours overlap for about 3 hours, roughly from 2:00 PM to 5:00 PM in Sydney time.
- Does daylight saving time change the difference between Sydney and Kolkata?
- Sydney observes daylight saving time while Kolkata does not, so the offset between them changes by one hour twice a year.
Local time page
Time in Sydney
Local time page
Time in Kolkata