Time Difference: Kolkata vs San Francisco
Kolkata
8:59:59 PM IST
Friday, November 13, 2026
13h 30m
13h 30m
San Francisco
7:29:59 AM PST
Friday, November 13, 2026
San Francisco is 13.5 hours behind Kolkata.
Quick Reference
- Kolkata
- IST (GMT+5:30)
No Daylight Saving Time
- San Francisco
- PST (GMT-8)
PDT starts on Mar 14, 2027
Frequently Asked Questions
- What is the time difference between Kolkata and San Francisco?
- San Francisco is 13.5 hours behind Kolkata.
- When is the best time to call from Kolkata to San Francisco?
- The best time to call is during overlapping business hours (9 AM – 5 PM) in both cities. Use the interactive converter on this page to visually compare hours side by side.
- Does the time difference change with daylight saving time?
- The time difference may change when either city enters or exits daylight saving time. Kolkata uses IST and San Francisco uses PST.