The time difference between Kolkata and Mumbai is 0 hours. Kolkata uses the Asia/Kolkata time zone (UTC+5:30), while Mumbai uses Asia/Kolkata (UTC+5:30).
There are 8 overlapping business hours between Kolkata and Mumbai (assuming 9:00–17:00 in each city). The ideal window for calls and meetings is:
Use this table to quickly convert any hour from Kolkata time to Mumbai time. Rows highlighted in green indicate overlapping business hours in both cities.
| Kolkata | Mumbai | |
|---|---|---|
| 00:00 | 00:00 | Night |
| 01:00 | 01:00 | Night |
| 02:00 | 02:00 | Night |
| 03:00 | 03:00 | Night |
| 04:00 | 04:00 | Night |
| 05:00 | 05:00 | Night |
| 06:00 | 06:00 | |
| 07:00 | 07:00 | |
| 08:00 | 08:00 | |
| 09:00 | 09:00 | Overlap |
| 10:00 | 10:00 | Overlap |
| 11:00 | 11:00 | Overlap |
| 12:00 | 12:00 | Overlap |
| 13:00 | 13:00 | Overlap |
| 14:00 | 14:00 | Overlap |
| 15:00 | 15:00 | Overlap |
| 16:00 | 16:00 | Overlap |
| 17:00 | 17:00 | |
| 18:00 | 18:00 | |
| 19:00 | 19:00 | |
| 20:00 | 20:00 | |
| 21:00 | 21:00 | |
| 22:00 | 22:00 | Night |
| 23:00 | 23:00 | Night |
Neither Kolkata nor Mumbai is currently observing daylight saving time. If either city observes DST, the time difference will change by 1 hour when DST begins or ends. Always double-check before scheduling across these time zones during March–April and October–November.
The time difference is 0 hours. Kolkata and Mumbai share the same current UTC offset.
It can. If either Kolkata or Mumbai observes daylight saving time, the gap will shift by 1 hour during the transition periods (typically March–April and October–November).
The best window is between 09:00 and 17:00 Kolkata time, which corresponds to 09:00–17:00 in Mumbai. Both sides fall within normal business hours.
No conversion is needed — both cities share the same UTC offset right now. Use the hour-by-hour table above for a quick reference.
For sunrise and sunset data, visit TheSunsetTimes.com. For detailed DST schedules, see DaylightSavingTime.info.