Current time in San Francisco
Costa Rica America/Costa_Rica UTC-06:00
Costa RicaCurrent time
America/Costa_Rica · CST (UTC-06:00)
Neighbouring days
- Previous day
- Today
- Next day
Sunrise and sunset
- Sunrise
- 05:27
- Sunset
- 17:12
- Solar noon
- 11:20
- Daylight
- 11 h 44 min
- Night
- 12 h 16 min
The local date has changed — reload the page for the new sunrise and sunset.
Today and the next four days
| Date | Sunrise | Sunset | Daylight | Change |
|---|---|---|---|---|
| 05:27 | 17:12 | 11 h 44 min | ||
| 05:28 | 17:12 | 11 h 44 min | no change | |
| 05:28 | 17:11 | 11 h 43 min | no change | |
| 05:28 | 17:11 | 11 h 43 min | no change | |
| 05:29 | 17:11 | 11 h 43 min | no change |
Twilight
| Kind | Begins (morning) | Ends (evening) |
|---|---|---|
| Civil twilight (daylight begins / ends) | 05:06 | 17:33 |
| Nautical twilight | 04:41 | 17:59 |
| Astronomical twilight | 04:15 | 18:24 |
Civil twilight is the period when the sun is within 6 degrees below the horizon — bright enough to see outdoors without lights, and what people usually mean by “it gets light” and “it gets dark”. Nautical uses 12 degrees and astronomical 18 degrees. At high latitudes a band can be absent for a whole day, in which case the row is left blank.
Longest and shortest days in 2026
- Longest day
- 12 h 43 min (20 June 2026)
- Shortest day
- 11 h 33 min (20 December 2026)
Computed from the coordinates of San Francisco: 9.9938, -84.12742.
Sunrise and sunset are the moments when the centre of the sun is 50 arcminutes below the horizon, which accounts for atmospheric refraction and the sun’s apparent radius — the same convention as common astronomical almanacs. Daylight is sunset minus sunrise; night is taken as 24 hours minus daylight. Elevation, terrain and local weather are not included, so observed times can differ by a minute or two.
Zone details
| Country / region | Costa Rica |
|---|---|
| Administrative division | Heredia Province |
| IANA time zone | America/Costa_Rica |
| Current UTC offset | UTC-06:00 |
| Zone abbreviation | CST |
| Population | 55,923 |
| Latitude / longitude | 9.9938000, -84.1274200 |
Daylight saving
San Francisco does not observe daylight saving and stays on UTC-06:00 all year.
This moment in other formats
| Unix timestamp | 1793915561 |
|---|---|
| ISO 8601 | 2026-11-05T15:52:41-06:00 |
| ISO week | 2026-W45 |
| Day of the year | day 309 of 365 |
| Days left this year | 56 days |
These values update with the clock above and use the local date in San Francisco.
Difference from a reference city
San Francisco is 6 hours behind London.
Both places are on the same date right now.
Working-hours overlap with London
About 3 h of overlap each day.
- San Francisco 09:00–12:00 matches London 15:00–18:00
Working hours are taken as 09:00–18:00 local on each side, using the offsets for today.
Hour-by-hour conversion
Calculated for 2026-11-05 local time in San Francisco. The two places start and end daylight saving on different dates, so another day can give a different result.
| San Francisco (source) | London (target) |
|---|---|
| 00:00 | 06:00 |
| 01:00 | 07:00 |
| 02:00 | 08:00 |
| 03:00 | 09:00 |
| 04:00 | 10:00 |
| 05:00 | 11:00 |
| 06:00 | 12:00 |
| 07:00 | 13:00 |
| 08:00 | 14:00 |
| 09:00 | 15:00 |
| 10:00 | 16:00 |
| 11:00 | 17:00 |
| 12:00 | 18:00 |
| 13:00 | 19:00 |
| 14:00 | 20:00 |
| 15:00 | 21:00 |
| 16:00 | 22:00 |
| 17:00 | 23:00 |
| 18:00 | 00:00 next day |
| 19:00 | 01:00 next day |
| 20:00 | 02:00 next day |
| 21:00 | 03:00 next day |
| 22:00 | 04:00 next day |
| 23:00 | 05:00 next day |
Other cities in Costa Rica
Cities also on America/Costa_Rica
How to use this page
The top of the page shows the current date and time in San Francisco, ticking in the America/Costa_Rica zone. To convert a specific moment to another city, use the comparison link below, where you can enter a date and time.
How the time is calculated
San Francisco is bound to the IANA identifier America/Costa_Rica. The server resolves the UTC offset and daylight saving state for the requested moment and renders the first view; the browser then keeps time in the same zone and re-syncs when the tab comes back to the foreground. No fixed offset stands in for the zone, and no zone is guessed from the city name.
FAQ
- Which time zone and UTC offset does San Francisco use right now?
- San Francisco uses the IANA time-zone identifier America/Costa_Rica, with a current UTC offset of UTC-06:00. That identifier represents date-based rules rather than one permanent hour difference; daylight saving can make offsets vary across dates. Keep the requested date when converting historical or future times. This page applies the city’s time-zone rules and shows the matching local date alongside its clock reading.
- Does San Francisco observe daylight saving, and what changes by date?
- Whether San Francisco observes daylight saving depends on the rules for America/Costa_Rica. The page shows the current status and lists the local time of a transition when one occurs; a year can have 0, 1, or 2 changes. Specify the date when checking a historical or future time, because today’s UTC offset cannot stand in for another date’s rule. Local clock changes can differ across time zones.
- Does the cached time page show the current time for San Francisco?
- Yes. The server provides an initial page value, then the browser immediately recalculates the current moment for America/Costa_Rica, refreshes the display every 1 second in 24-hour format, and continues the clock; it resynchronizes when you return to the tab. Cached HTML does not leave the clock frozen at its generation time. The offset still follows the selected date’s zone rules, and a webpage clock is not a precision time-synchronization instrument.