Time Difference Between San Francisco and Singapore
Singapore is 16h ahead of San Francisco in standard time, and 15h ahead while San Francisco is on daylight saving time.
San Francisco clocks move forward on the second Sunday of March and back on the first Sunday of November. Singapore keeps the same clock all year. The figures above cover each part of the year. They do not come from the offset on the day the site was built. The live clocks use the current time.
Working Hours Overlap
For each hour of San Francisco's working day (9:00-18:00), here is the corresponding local time in Singapore. Rows highlighted green fall within standard working hours (9:00-18:00) in both cities. Each block is one part of the year, so the table does not change with the day this page was built.
16h ahead (standard time)
| San Francisco | Singapore | Both working hours? |
|---|---|---|
| 9 AM | 1 AM | No |
| 10 AM | 2 AM | No |
| 11 AM | 3 AM | No |
| 12 PM | 4 AM | No |
| 1 PM | 5 AM | No |
| 2 PM | 6 AM | No |
| 3 PM | 7 AM | No |
| 4 PM | 8 AM | No |
| 5 PM | 9 AM | Yes |
| 6 PM | 10 AM | No |
15h ahead (daylight saving time in San Francisco, while Singapore is on standard time)
| San Francisco | Singapore | Both working hours? |
|---|---|---|
| 9 AM | 12 AM | No |
| 10 AM | 1 AM | No |
| 11 AM | 2 AM | No |
| 12 PM | 3 AM | No |
| 1 PM | 4 AM | No |
| 2 PM | 5 AM | No |
| 3 PM | 6 AM | No |
| 4 PM | 7 AM | No |
| 5 PM | 8 AM | No |
| 6 PM | 9 AM | No |
Best Time to Meet
16h ahead (standard time)
- 5 PM-6 PM in San Francisco (9 AM-10 AM in Singapore) works for both sides. It falls within 9 AM-6 PM in both time zones.
15h ahead (daylight saving time in San Francisco, while Singapore is on standard time)
San Francisco and Singapore don't share a 9 AM-6 PM working-hours window during daylight saving time in San Francisco, while Singapore is on standard time. The least disruptive compromise is around 3 PM in San Francisco, which falls at 6 AM in Singapore. Expect one side to take an early or late call.
How the Difference Changes
Only San Francisco changes its clocks, so the gap is not one number. The rules are above. The dates for the year you are reading this page load below.
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Working Across San Francisco and Singapore
San Francisco and Singapore do not share a workday, and hunting for one wastes a week of email. Singapore is 15 hours ahead from the second Sunday of March to the first Sunday of November, so 5 PM in San Francisco is 8 AM the next morning in Singapore. From the first Sunday of November until the second Sunday of March the gap is 16 hours, and that same 8 AM Singapore slot moves to 4 PM in San Francisco. Pick one direction and keep it. The usual tech pattern is San Francisco's end of day into Singapore's next morning, because Singapore reads the US day's decisions at breakfast. The other way, 8 AM in San Francisco, is 11 PM or midnight in Singapore.
Singapore never changes its clock, so every slide on this pair is San Francisco's. The 16-hour winter setting is the slightly kinder one for California, because the call moves an hour earlier in the San Francisco afternoon. A recurring invite created in San Francisco time will hold the California hour and move the Singapore hour in March and November. Write both local times into the standing agenda the week before, including the date on the Singapore side, because 'tomorrow morning' in Singapore is still 'this evening' in California.
The nonstop is one of the longer flights operating, about seventeen hours westbound and a bit less coming back, when the winds help. Westbound you lose a calendar day: leave San Francisco at night and you land two mornings later. Eastbound the clock gives a chunk of that back and you can arrive the same calendar day you left. Nobody adjusts to a 15-hour shift on a short trip. For anything under four days, stay on one clock on purpose instead of splitting the difference and sleeping badly in both.
Guides for this corridor
- A handoff note for teams with no shared workday
What to write at the end of the day when New York and Tokyo, or San Francisco and Singapore, will not both be at a desk. A format, a worked example, and the words that cause the next morning to stall.
- A worked week for San Francisco, Berlin, and Singapore
There is no hour when all three cities are inside a normal workday. A concrete weekly design: who meets live, who reads notes, and which local times hold still between January and July.
San Francisco
San Francisco uses the America/Los_Angeles time zone. Standard time is UTC-8, and daylight saving time is UTC-7.
Singapore
Singapore uses the Asia/Singapore time zone, at UTC+8 all year. This zone does not observe daylight saving time.