Time difference
Kolkata to San Francisco Time Difference
San Francisco is 12 hours and 30 minutes behind Kolkata — when it's 12:00 PM in Kolkata, it's 11:30 PM the previous day in San Francisco. (Kolkata (Asia/Kolkata, IST); San Francisco (America/Los_Angeles, PDT).) Below: live local times, the best hours for a call, a full conversion table, and exact daylight-saving dates.
San Francisco is 12 hours and 30 minutes behind Kolkata. Standard 9 AM–5 PM business hours in Kolkata and San Francisco do not overlap, so a live call needs one side outside normal hours. Clocks change on November 1, 2026, which briefly shifts the gap between Kolkata and San Francisco — the converter on this page always reflects the correct offset for the date you pick.
- When it's 9:00 AM in Kolkata, it's 8:30 PM the previous day in San Francisco.
- When it's 9:00 AM in San Francisco, it's 9:30 PM in Kolkata.
San Francisco is currently 12 hours and 30 minutes behind Kolkata.
Interactive converter
12:00PM
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Best times to meet
Standard 9 AM – 5 PM hours in Kolkata and San Francisco do not overlap. The least-bad options are an early start in one city or a late evening call in the other — for example a 7–8 AM meeting in Kolkata, or a 6–8 PM meeting in San Francisco.
Quick conversion table
| Kolkata | San Francisco |
|---|---|
| 12 AM | 11:30 AM (prev day) |
| 1 AM | 12:30 PM (prev day) |
| 2 AM | 1:30 PM (prev day) |
| 3 AM | 2:30 PM (prev day) |
| 4 AM | 3:30 PM (prev day) |
| 5 AM | 4:30 PM (prev day) |
| 6 AM | 5:30 PM (prev day) |
| 7 AM | 6:30 PM (prev day) |
| 8 AM | 7:30 PM (prev day) |
| 9 AM | 8:30 PM (prev day) |
| 10 AM | 9:30 PM (prev day) |
| 11 AM | 10:30 PM (prev day) |
| 12 PM | 11:30 PM (prev day) |
| 1 PM | 12:30 AM |
| 2 PM | 1:30 AM |
| 3 PM | 2:30 AM |
| 4 PM | 3:30 AM |
| 5 PM | 4:30 AM |
| 6 PM | 5:30 AM |
| 7 PM | 6:30 AM |
| 8 PM | 7:30 AM |
| 9 PM | 8:30 AM |
| 10 PM | 9:30 AM |
| 11 PM | 10:30 AM |
Daylight saving
On November 1, 2026, San Francisco shifts for daylight saving. After that, San Francisco will be 13 hours and 30 minutes behind Kolkata (currently 12 hours and 30 minutes behind Kolkata). The converter and the tables above always reflect the correct offset for the date you pick.
- Kolkata does not observe daylight saving time.
- San Francisco is currently observing daylight saving time.
Frequently asked questions
- Is San Francisco ahead of or behind Kolkata?
- San Francisco is 12 hours and 30 minutes behind Kolkata.
- How many hours behind Kolkata is San Francisco?
- San Francisco is 12 hours and 30 minutes behind Kolkata.
- What time is 9 AM in Kolkata in San Francisco?
- 9:00 AM in Kolkata is 8:30 PM the previous day in San Francisco.
- What time is noon in Kolkata in San Francisco?
- 12:00 PM in Kolkata is 11:30 PM the previous day in San Francisco.
- What time is 5 PM in Kolkata in San Francisco?
- 5:00 PM in Kolkata is 4:30 AM in San Francisco. Useful for end-of-day handoffs between the two offices.
- What time is 3 PM in Kolkata in San Francisco?
- 3:00 PM in Kolkata is 2:30 AM in San Francisco.
- Is Kolkata currently observing daylight saving time?
- Kolkata does not observe daylight saving time — its UTC offset stays the same all year.
- Is San Francisco currently observing daylight saving time?
- San Francisco is currently observing daylight saving time (summer time).
- Do Kolkata and San Francisco observe daylight saving?
- On November 1, 2026, San Francisco shifts for daylight saving. After that, San Francisco will be 13 hours and 30 minutes behind Kolkata (currently 12 hours and 30 minutes behind Kolkata). The converter and the tables above always reflect the correct offset for the date you pick.
- When is the best time to call San Francisco from Kolkata?
- Kolkata and San Francisco business hours don't overlap. The closest options are early mornings in Kolkata or late evenings, when one side stretches outside 9–5.
- When is the best time to call Kolkata from San Francisco?
- San Francisco and Kolkata business hours don't overlap. The closest options are early mornings in San Francisco or late evenings, when one side stretches outside 9–5.
- Kolkata (IST) to San Francisco (PDT) — how do I convert quickly?
- Subtract 12 hours and 30 minutes from Kolkata local time to get San Francisco local time. Or use the converter at the top of this page — it stays accurate through daylight-saving changes automatically.
Other conversions
- Kolkata to New York
- Kolkata to London
- Kolkata to Tokyo
- Dubai to Kolkata
- Kolkata to Singapore
- Kolkata to Los Angeles
- Kolkata to Sydney
- Kolkata to Paris
- Kolkata to Mumbai
- Hong Kong to Kolkata