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