The time difference between Kolkata and San Francisco is 13 hours and 30 minutes. When it is 12:00 noon in Kolkata, it is 22:30 in San Francisco. Kolkata uses the Asia/Kolkata time zone (UTC+5:30), while San Francisco uses America/Los_Angeles (UTC-8).
| Detail | Kolkata | San Francisco |
|---|---|---|
| Time Zone ID | Asia/Kolkata | America/Los_Angeles |
| UTC Offset | UTC+5:30 | UTC-8 |
| Abbreviation | IST | PST |
| DST Active | No | No |
| Country | India | United States |
| Region | Asia | North America |
With a 13 hours and 30 minutes gap, there is no standard business-hours overlap between Kolkata and San Francisco. One party will need to adjust their schedule. Early mornings in Kolkata or late evenings in San Francisco tend to be the most practical compromise.
Use this table to quickly convert any hour from Kolkata time to San Francisco time. Rows highlighted in green indicate overlapping business hours in both cities.
| Kolkata | San Francisco | |
|---|---|---|
| 00:00 | 10:30 (-1 day) | Night |
| 01:00 | 11:30 (-1 day) | Night |
| 02:00 | 12:30 (-1 day) | Night |
| 03:00 | 13:30 (-1 day) | Night |
| 04:00 | 14:30 (-1 day) | Night |
| 05:00 | 15:30 (-1 day) | Night |
| 06:00 | 16:30 (-1 day) | |
| 07:00 | 17:30 (-1 day) | |
| 08:00 | 18:30 (-1 day) | |
| 09:00 | 19:30 (-1 day) | |
| 10:00 | 20:30 (-1 day) | |
| 11:00 | 21:30 (-1 day) | |
| 12:00 | 22:30 (-1 day) | |
| 13:00 | 23:30 (-1 day) | |
| 14:00 | 00:30 | |
| 15:00 | 01:30 | |
| 16:00 | 02:30 | |
| 17:00 | 03:30 | |
| 18:00 | 04:30 | |
| 19:00 | 05:30 | |
| 20:00 | 06:30 | |
| 21:00 | 07:30 | |
| 22:00 | 08:30 | Night |
| 23:00 | 09:30 | Night |
Neither Kolkata nor San Francisco 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 13 hours and 30 minutes. San Francisco is 13 hours and 30 minutes behind Kolkata.
It can. If either Kolkata or San Francisco observes daylight saving time, the gap will shift by 1 hour during the transition periods (typically March–April and October–November).
There is no ideal window during standard business hours. Consider scheduling at the edges — early morning for the city that is ahead and late afternoon for the city that is behind.
Subtract 13 hours and 30 minutes from Kolkata time to get San Francisco time. 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.