Current Time in San Francisco, United States

San Francisco operates on the America/Los_Angeles timezone, switching between PST (Pacific Standard Time, UTC −8:00) in winter and PDT (Pacific Daylight Time, UTC −7:00) from mid-March to early November. While San Francisco shares a timezone with Los Angeles, the city carries its own outsized global significance as the cultural and geographic centre of Silicon Valley — the world's most concentrated technology ecosystem.

San Francisco is home to or adjacent to the headquarters of Apple, Google, Meta, Salesforce, Twitter/X, Uber, Airbnb, and hundreds of major tech companies and venture capital firms. The tech industry's culture of global remote work has made Pacific Time — and specifically San Francisco's business hours — one of the most widely attended time slots in international video conferencing. An all-hands meeting at a San Francisco tech company at 10:00 AM PST reaches employees in London at 6:00 PM GMT, in Singapore at 2:00 AM (next day), and in Sydney at 5:00 AM.

San Francisco observes daylight saving time on the same US federal schedule as Los Angeles: clocks spring forward on the second Sunday in March and fall back on the first Sunday in November. The Bay Area's latitude means the practical impact on sunrise/sunset times is more pronounced than in Southern California, with significantly longer summer days.

The San Francisco Bay Area spans multiple cities — San Francisco, San Jose, Oakland, Berkeley, Palo Alto, Mountain View — all sharing PST/PDT. Despite the region's global tech influence, the timezone gap with Asia (15–17 hours behind Tokyo, 15–16 hours behind Singapore) remains one of the biggest operational challenges for Silicon Valley companies with large Asia-Pacific engineering teams.