Cairo zone
GMT+3 (GMT+3)
Kolkata zone
GMT+5:30 (GMT+5:30)
Difference
2h 30m ahead of Cairo
Business overlap
6h (9-5 windows)
Working hours overlap
Each cell is one hour in Cairo. Filled cells mark when 9 AM – 5 PM in Cairo and Kolkata both apply.
6 hours per day
- Cairo
- GMT+3
- Kolkata
- GMT+5:30
- Difference
- +2h 30m
- Business overlap
- 6h
Hour-by-hour conversion
Each row shows the matching local time in Kolkata for an hour in Cairo.
| Cairo | Kolkata | Day | Window |
|---|---|---|---|
| 12:00 AM | 2:30 AM | same day | — |
| 1:00 AM | 3:30 AM | same day | — |
| 2:00 AM | 4:30 AM | same day | — |
| 3:00 AM | 5:30 AM | same day | — |
| 4:00 AM | 6:30 AM | same day | — |
| 5:00 AM | 7:30 AM | same day | — |
| 6:00 AM | 8:30 AM | same day | — |
| 7:00 AM | 9:30 AM | same day | — |
| 8:00 AM | 10:30 AM | same day | — |
| 9:00 AM | 11:30 AM | same day | Both 9-5 |
| 10:00 AM | 12:30 PM | same day | Both 9-5 |
| 11:00 AM | 1:30 PM | same day | Both 9-5 |
| 12:00 PM | 2:30 PM | same day | Both 9-5 |
| 1:00 PM | 3:30 PM | same day | Both 9-5 |
| 2:00 PM | 4:30 PM | same day | Both 9-5 |
| 3:00 PM | 5:30 PM | same day | — |
| 4:00 PM | 6:30 PM | same day | — |
| 5:00 PM | 7:30 PM | same day | — |
| 6:00 PM | 8:30 PM | same day | — |
| 7:00 PM | 9:30 PM | same day | — |
| 8:00 PM | 10:30 PM | same day | — |
| 9:00 PM | 11:30 PM | same day | — |
| 10:00 PM | 12:30 AM | next day | — |
| 11:00 PM | 1:30 AM | next day | — |
Best meeting windows
If both teams keep standard 9 AM – 5 PM hours, the overlap window is roughly 9:00 AM – 3:00 PM in Cairo time. That gives you 6 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 Cairo time to Kolkata time
Cairo follows the Africa/Cairo time zone (currently GMT+3, GMT+3), while Kolkata follows Asia/Kolkata (currently GMT+5:30, GMT+5:30). Kolkata is 2h 30m ahead of Cairo right now.
Cairo 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
Cairo
- Spring forward · Thursday, April 23, 2026
- Fall back · Thursday, October 29, 2026
Kolkata
Does not observe daylight saving time.
Reverse this conversion
Kolkata to Cairo
Open the converter
Plan a meeting between Cairo and Kolkata
More conversions from Cairo
Frequently asked questions
- How many hours is Cairo from Kolkata?
- Kolkata is 2h 30m ahead of Cairo right now.
- What time is 9:00 AM Cairo in Kolkata?
- 9:00 AM in Cairo is 11:30 AM in Kolkata.
- What time is 5:00 PM Cairo in Kolkata?
- 5:00 PM in Cairo is 7:30 PM in Kolkata.
- When do Cairo and Kolkata business hours overlap?
- Standard 9 AM - 5 PM working hours overlap for about 6 hours, roughly from 9:00 AM to 3:00 PM in Cairo time.
- Does daylight saving time change the difference between Cairo and Kolkata?
- Cairo 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 Cairo
Local time page
Time in Kolkata