Kolkata zone
GMT+5:30 (GMT+5:30)
Sydney zone
GMT+10 (GMT+10)
Difference
4h 30m ahead of Kolkata
Business overlap
4h (9-5 windows)
Working hours overlap
Each cell is one hour in Kolkata. Filled cells mark when 9 AM – 5 PM in Kolkata and Sydney both apply.
4 hours per day
- Kolkata
- GMT+5:30
- Sydney
- GMT+10
- Difference
- +4h 30m
- Business overlap
- 4h
Hour-by-hour conversion
Each row shows the matching local time in Sydney for an hour in Kolkata.
| Kolkata | Sydney | Day | Window |
|---|---|---|---|
| 12:00 AM | 4:30 AM | same day | — |
| 1:00 AM | 5:30 AM | same day | — |
| 2:00 AM | 6:30 AM | same day | — |
| 3:00 AM | 7:30 AM | same day | — |
| 4:00 AM | 8:30 AM | same day | — |
| 5:00 AM | 9:30 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 | Both 9-5 |
| 10:00 AM | 2:30 PM | same day | Both 9-5 |
| 11:00 AM | 3:30 PM | same day | Both 9-5 |
| 12:00 PM | 4:30 PM | same day | Both 9-5 |
| 1:00 PM | 5:30 PM | same day | — |
| 2:00 PM | 6:30 PM | same day | — |
| 3:00 PM | 7:30 PM | same day | — |
| 4:00 PM | 8:30 PM | same day | — |
| 5:00 PM | 9:30 PM | same day | — |
| 6:00 PM | 10:30 PM | same day | — |
| 7:00 PM | 11:30 PM | same day | — |
| 8:00 PM | 12:30 AM | next day | — |
| 9:00 PM | 1:30 AM | next day | — |
| 10:00 PM | 2:30 AM | next day | — |
| 11:00 PM | 3:30 AM | next day | — |
Best meeting windows
If both teams keep standard 9 AM – 5 PM hours, the overlap window is roughly 9:00 AM – 1:00 PM in Kolkata time. That gives you 4 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 Kolkata time to Sydney time
Kolkata follows the Asia/Kolkata time zone (currently GMT+5:30, GMT+5:30), while Sydney follows Australia/Sydney (currently GMT+10, GMT+10). Sydney is 4h 30m ahead of Kolkata 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
Kolkata
Does not observe daylight saving time.
Sydney
- Fall back · Sunday, April 5, 2026
- Spring forward · Sunday, October 4, 2026
Reverse this conversion
Sydney to Kolkata
Open the converter
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Frequently asked questions
- How many hours is Kolkata from Sydney?
- Sydney is 4h 30m ahead of Kolkata right now.
- What time is 9:00 AM Kolkata in Sydney?
- 9:00 AM in Kolkata is 1:30 PM in Sydney.
- What time is 5:00 PM Kolkata in Sydney?
- 5:00 PM in Kolkata is 9:30 PM in Sydney.
- When do Kolkata and Sydney business hours overlap?
- Standard 9 AM - 5 PM working hours overlap for about 4 hours, roughly from 9:00 AM to 1:00 PM in Kolkata time.
- Does daylight saving time change the difference between Kolkata and Sydney?
- 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 Kolkata
Local time page
Time in Sydney