Kolkata zone
GMT+5:30 (GMT+5:30)
San Francisco zone
PDT (GMT-7)
Difference
12h 30m behind Kolkata
Business overlap
No 9-5 overlap
Working hours overlap
Each cell is one hour in Kolkata. Filled cells mark when 9 AM – 5 PM in Kolkata and San Francisco both apply.
0 hours per day
- Kolkata
- GMT+5:30
- San Francisco
- GMT-7
- Difference
- -12h 30m
- Business overlap
- 0h
Hour-by-hour conversion
Each row shows the matching local time in San Francisco for an hour in Kolkata.
| Kolkata | San Francisco | Day | Window |
|---|---|---|---|
| 12:00 AM | 11:30 AM | previous day | — |
| 1:00 AM | 12:30 PM | previous day | — |
| 2:00 AM | 1:30 PM | previous day | — |
| 3:00 AM | 2:30 PM | previous day | — |
| 4:00 AM | 3:30 PM | previous day | — |
| 5:00 AM | 4:30 PM | previous day | — |
| 6:00 AM | 5:30 PM | previous day | — |
| 7:00 AM | 6:30 PM | previous day | — |
| 8:00 AM | 7:30 PM | previous day | — |
| 9:00 AM | 8:30 PM | previous day | — |
| 10:00 AM | 9:30 PM | previous day | — |
| 11:00 AM | 10:30 PM | previous day | — |
| 12:00 PM | 11:30 PM | previous day | — |
| 1:00 PM | 12:30 AM | same day | — |
| 2:00 PM | 1:30 AM | same day | — |
| 3:00 PM | 2:30 AM | same day | — |
| 4:00 PM | 3:30 AM | same day | — |
| 5:00 PM | 4:30 AM | same day | — |
| 6:00 PM | 5:30 AM | same day | — |
| 7:00 PM | 6:30 AM | same day | — |
| 8:00 PM | 7:30 AM | same day | — |
| 9:00 PM | 8:30 AM | same day | — |
| 10:00 PM | 9:30 AM | same day | — |
| 11:00 PM | 10:30 AM | same day | — |
Best meeting windows
Standard 9 AM – 5 PM hours in Kolkata and San Francisco do not overlap. Plan calls for early Kolkata morning or late Kolkata evening, and rotate the burden between sides.
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 San Francisco time
Kolkata follows the Asia/Kolkata time zone (currently GMT+5:30, GMT+5:30), while San Francisco follows America/Los_Angeles (currently PDT, GMT-7). San Francisco is 12h 30m behind Kolkata right now.
San Francisco 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.
San Francisco
- Spring forward · Sunday, March 8, 2026
- Fall back · Sunday, November 1, 2026
Reverse this conversion
San Francisco to Kolkata
Open the converter
Plan a meeting between Kolkata and San Francisco
More conversions from Kolkata
Frequently asked questions
- How many hours is Kolkata from San Francisco?
- San Francisco is 12h 30m behind Kolkata right now.
- What time is 9:00 AM Kolkata in San Francisco?
- 9:00 AM in Kolkata is 8:30 PM (previous day) in San Francisco.
- What time is 5:00 PM Kolkata in San Francisco?
- 5:00 PM in Kolkata is 4:30 AM in San Francisco.
- When do Kolkata and San Francisco business hours overlap?
- Standard 9 AM - 5 PM working hours in Kolkata and San Francisco do not overlap. You will need an early or late call.
- Does daylight saving time change the difference between Kolkata and San Francisco?
- San Francisco 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 San Francisco