Does San Francisco observe daylight saving time?

Yes. San Francisco is on PDT (UTC-7) now, and its clocks go back 1 hour on Sun, Nov 1, to PST (UTC-8).

Does Tehran observe daylight saving time?

No. Tehran stays on IRST (UTC+3:30) all year, so its clocks don't change.

What time is it in Tehran when it's 9 AM in San Francisco?

7:30 PM in Tehran, on the same day.

San Francisco to Tehran Meeting Planner

Tehran is 10 hours 30 minutes ahead of San Francisco right now. Their working days don't overlap today.

San Francisco · United States

6:00 PM

Sat, Oct 17 · PDT · summer time

Tehran · Iran

4:30 AM

Sun, Oct 18 · IRST

Best Meeting Times Between San Francisco and Tehran

No time falls inside working hours (9 AM to 5 PM) in both cities. The closest is 9:00 AM in San Francisco, which is 7:30 PM in Tehran; consider splitting into two shorter meetings or shifting someone's hours.

Who's meeting

2 of 4 places

San FranciscoOrganizerUnited States ·· summer time6:00PMnow
TehranIran ·4:30AMTomorrow · now

Add a city

Add up to 4 places by city, country, time zone or abbreviation, like Tokyo, India or JST. Press "/" to jump here.

Date in San Francisco

Working hours, everywhere

Best times to meet

Saturday, October 17, 2026, in San Francisco time.

9:00AMBest · GoodWorking hours in San Francisco (09:00); just outside working hours in Tehran (19:30).
12:00PMOption 2 · PossibleWorking hours in San Francisco (12:00); late evening in Tehran (22:30).
11:30AMOption 3 · PossibleWorking hours in San Francisco (11:30); late evening in Tehran (22:00).

The whole day

Pick any slot in the Fit row, or use the arrow keys there, to make it the meeting time.

Each column is a half hour of the first place's day. The Fit row grades how well the slot suits everyone; each row shows the local time and whether it's working hours there.
Fit
San FranciscoPDT
TehranUTC+3:30
UTC	07	08	09	10	11	12	13	14	15	16	17	18	19	20	21	22	23	00	01	02	03	04	05	06

Working hours (09–17)Just outside (07–09, 17–20)Late evening (20–23)NightFit: optimal, good, possible, poor

Your meeting

San Francisco9:00 AM PDTSat, Oct 17
Tehran7:30 PM UTC+3:30Sat, Oct 17
UTC2026-10-17 16:00 UTC

What will it cost? Try the meeting cost calculator.

Time difference between San Francisco and Tehran

Tehran is 10 hours 30 minutes ahead of San Francisco right now: Tehran is on IRST (UTC+3:30) and San Francisco on PDT (UTC-7). That changes on Sun, Nov 1, when clocks go back in San Francisco: then Tehran is 11 hours 30 minutes ahead of San Francisco.

Time difference between San Francisco and Tehran over the next 12 months
From	Difference	Why
Now	Tehran 10 hours 30 minutes ahead	—
Sun, Nov 1	Tehran 11 hours 30 minutes ahead	Clocks go back in San Francisco
Sun, Mar 14, 2027	Tehran 10 hours 30 minutes ahead	Clocks go forward in San Francisco

San Francisco is on Pacific Standard Time. Tehran is on Iran Standard Time.

Frequently Asked Questions: San Francisco & Tehran Scheduling

What is the time difference between San Francisco and Tehran?: Tehran is 10 hours 30 minutes ahead of San Francisco right now: Tehran is on IRST (UTC+3:30) and San Francisco on PDT (UTC-7). That changes on Sun, Nov 1, when clocks go back in San Francisco: then Tehran is 11 hours 30 minutes ahead of San Francisco.
What is the best time to schedule a meeting between San Francisco and Tehran?: No time falls inside working hours (9 AM to 5 PM) in both cities. The closest is 9:00 AM in San Francisco, which is 7:30 PM in Tehran; consider splitting into two shorter meetings or shifting someone's hours.
Does San Francisco observe daylight saving time?: Yes. San Francisco is on PDT (UTC-7) now, and its clocks go back 1 hour on Sun, Nov 1, to PST (UTC-8).
Does Tehran observe daylight saving time?: No. Tehran stays on IRST (UTC+3:30) all year, so its clocks don't change.
What time is it in Tehran when it's 9 AM in San Francisco?: 7:30 PM in Tehran, on the same day.

Or see every city pair, or plan with more places in the meeting planner.