When it is 09:00 in Bangkok it is 18:00 in San Francisco in January and 19:00 in July. San Francisco is 15 hours behind Bangkok right now — but it is not constant: the difference is 15 hours behind in January and 14 hours behind in July. This page gives the live times in both cities, the overlap between their working days, the daylight saving dates that move the difference, and the best meeting windows.
Try the tool: Time Zone Converter — convert any time between Bangkok and San Francisco, with the offset for the date you pick.
Live times in Bangkok and San Francisco
The two cities side by side. The January column uses the winter offsets (Bangkok UTC+07:00, San Francisco UTC−08:00); the July column uses the summer offsets (Bangkok UTC+07:00, San Francisco UTC−07:00).
| Time in Bangkok | San Francisco in January | San Francisco in July |
|---|---|---|
| 00:00 | 09:00 | 10:00 |
| 06:00 | 15:00 | 16:00 |
| 09:00 | 18:00 | 19:00 |
| 12:00 | 21:00 | 22:00 |
| 15:00 | 00:00 | 01:00 |
| 17:00 | 02:00 | 03:00 |
| 21:00 | 06:00 | 07:00 |
The world clock shows the current time in both cities live, and the individual city pages — time in Bangkok and time in San Francisco — explain each city's time zone, offsets and daylight saving in full.
The time difference between Bangkok and San Francisco
The difference is not constant. In January San Francisco is 15 hours behind Bangkok; in July it is 14 hours behind Bangkok. The difference changes on Sunday, 8 March 2026 (from 15 hours behind to 14 hours behind) and Sunday, 1 November 2026 (from 14 hours behind to 15 hours behind) — those are the dates when one of the two cities changes its clocks and the other does not, or when they change on different days. Between those dates the difference is one value; outside them it is the other.
To convert a time, add the difference: 09:00 in Bangkok is 18:00 in San Francisco in January and 19:00 in July; 17:00 in Bangkok — the end of the working day — is 02:00 in San Francisco in January and 03:00 in July. To go the other way, subtract it: 09:00 in San Francisco is 00:00 in Bangkok in January. The time difference calculator does the arithmetic for any date, and the UTC to San Francisco page gives the full conversion table for San Francisco.
Meeting overlap between Bangkok and San Francisco
The overlap is the hours when both cities are in their working day (09:00–17:00 local time). The table marks the overlapping hours in Bangkok's working day and shows what time they are in San Francisco.
January
| Bangkok time | San Francisco time | Both working? |
|---|---|---|
| 09:00 | 18:00 | No |
| 10:00 | 19:00 | No |
| 11:00 | 20:00 | No |
| 12:00 | 21:00 | No |
| 13:00 | 22:00 | No |
| 14:00 | 23:00 | No |
| 15:00 | 00:00 | No |
| 16:00 | 01:00 | No |
July
| Bangkok time | San Francisco time | Both working? |
|---|---|---|
| 09:00 | 19:00 | Yes |
| 10:00 | 20:00 | Yes |
| 11:00 | 21:00 | Yes |
| 12:00 | 22:00 | Yes |
| 13:00 | 23:00 | Yes |
| 14:00 | 00:00 | Yes |
| 15:00 | 01:00 | Yes |
| 16:00 | 02:00 | Yes |
In January the overlap is 0 hours: there is no hour when both cities are in their working day. In July it is 8 hours: 09:00, 10:00, 11:00, 12:00, 13:00, 14:00, 15:00, 16:00 Bangkok time. The meeting planner finds the overlap for any two cities and any date, and the meeting time finder finds it for a whole team.
Daylight saving in Bangkok and San Francisco
Bangkok does not observe daylight saving, so its offset of UTC+07:00 never changes.
San Francisco observes daylight saving: in 2026 the clocks go forward on 8 March 2026 and back on 1 November 2026, moving the offset from UTC−08:00 to UTC−07:00.
The difference changes on Sunday, 8 March 2026 and Sunday, 1 November 2026 in 2026. On those dates, one city changes its clocks and the other does not — or they change on different days — so the difference moves by an hour. A standing meeting set in one city's local time will land an hour early or late on the other side until the second city catches up. The fix is to set the calendar event in UTC, or to check the overlap again after each change. The individual DST pages — Bangkok DST 2026 and San Francisco DST 2026 — give the exact dates for each city.
Best meeting windows
In July the best windows are 09:00–17:00 in Bangkok (19:00–03:00 in San Francisco) — the same logic, with the July offsets.
Calling and travel notes
When it is 09:00 in Bangkok it is 18:00 in San Francisco in January; when it is 12:00 in Bangkok it is 21:00 in San Francisco; when it is 17:00 in Bangkok it is 02:00 in San Francisco. The difference is 12 hours or more, so the two cities are on different dates for part of the day: when it is Monday morning in Bangkok, it is still Sunday in San Francisco if San Francisco is behind, or already Monday evening if it is ahead. Always state the date as well as the time when you schedule across this pair. Scheduling between the Americas and Asia is the hardest case in time-zone work: the difference is 12 hours or more, so one side's working day is the other's night. The only workable approach is to meet at the edge of the day — early morning in Bangkok and evening in San Francisco, or the reverse — and to keep the meeting short. Rotate the awkward hour week by week, or the same side will always be the one giving up its evening. Record the meeting and share notes, so the side that could not attend can still follow the decision.
Worked conversions
Six conversions, for January (offsets Bangkok UTC+07:00, San Francisco UTC−08:00):
| Bangkok | San Francisco |
|---|---|
| 08:00 | 17:00 |
| 09:00 | 18:00 |
| 12:00 | 21:00 |
| 14:00 | 23:00 |
| 17:00 | 02:00 |
| 20:00 | 05:00 |
In July, add 1 hour to each San Francisco time. For the reverse direction, see San Francisco to Bangkok time.
Bangkok and San Francisco at a glance
| Fact | Bangkok | San Francisco |
|---|---|---|
| Country | Thailand | United States |
| Region | Asia | Americas |
| IANA time zone | Asia/Bangkok |
America/Los_Angeles |
| Standard offset | UTC+07:00 | UTC−08:00 |
| Daylight saving offset | — does not observe | UTC−07:00 |
| Offset in January 2026 | UTC+07:00 | UTC−08:00 |
| Offset in July 2026 | UTC+07:00 | UTC−07:00 |
| Observes daylight saving | No | Yes |
The table is the whole pair in one place. The two numbers that matter most are the January and July offsets: if they are the same in both columns for a city, that city's offset never changes; if they differ, the city observes daylight saving and the difference between the cities moves with it. The individual city pages — time in Bangkok and time in San Francisco — explain each city's time zone, and the DST pages — Bangkok DST 2026 and San Francisco DST 2026 — give the exact change dates.
Frequently asked questions
What is the time difference between Bangkok and San Francisco?
San Francisco is 15 hours behind Bangkok right now. In January the difference is 15 hours behind and in July it is 14 hours behind — it changes with daylight saving.
How do I schedule a recurring meeting between Bangkok and San Francisco?
Pick a time inside the overlap — the edge of the day, since there is no overlap — and set the calendar event in UTC so it moves correctly when the clocks change. Re-check the overlap in March and October, when the difference moves, and rotate the time if the meeting falls outside someone's working day.
What time is it in San Francisco when it is 09:00 in Bangkok?
It is 18:00 in January and 19:00 in July. The time zone converter gives the answer for any date.
What is the best time for a meeting between Bangkok and San Francisco?
There is no hour inside both working days. Meet at the edge of the day — early morning in one city, evening in the other — and rotate the awkward hour.
Does the time difference between Bangkok and San Francisco change during the year?
Yes. It changes on Sunday, 8 March 2026 and Sunday, 1 November 2026 in 2026, when one city changes its clocks and the other does not.
What time is it in Bangkok when it is 09:00 in San Francisco?
It is 00:00 in January and 23:00 in July. See San Francisco to Bangkok time for the full comparison from San Francisco's side.
What are the time zones of Bangkok and San Francisco?
Bangkok is in Asia/Bangkok (UTC+07:00 standard time) and San Francisco is in America/Los_Angeles (UTC−08:00 standard time).
What time is it in Bangkok when it is midnight in San Francisco?
It is 15:00 in Bangkok in January and 14:00 in July — the previous day, because San Francisco is ahead of Bangkok. Midnight conversions are the ones that most often land on the wrong date, so always check the date as well as the time.
Sources
- IANA Time Zone Database, via Node.js Intl (
Intl.DateTimeFormatwithtimeZone) — offsets, daylight saving dates and local times in this article were worked out from the IANA database, not typed from memory. - TimeFlow's own time-zone data (
data/cities.ts,data/dst.ts), computed from the IANA database. - TimeFlow's time zone converter and meeting planner — the live tools behind the numbers on this page.
- Time-zone and daylight saving rules are set by governments and can change. For flights, deadlines and meetings that cannot move, confirm the time with an official source.