San Diego, United States · UTC-7
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San Diego is the westernmost major city in the continental United States. It runs on Pacific Time, UTC-8 in winter (PST) and UTC-7 during daylight saving (PDT), the same clock as San Francisco and Los Angeles to the north. The Pacific coast from Mexico to Canada synchronizes on this single timezone.
United States Pacific Time is set by the longitude that runs through the Pacific Coast. San Diego, at 32 degrees north, gets the most temperate version of this timezone: warm year-round, minimal seasonal variation in temperature, morning marine layer burning off by noon, clear evenings.
The Tijuana border, 30 kilometers south, is where Pacific Time meets a different Mexican Baja California timezone that actually tracks the same rules. San Diego and Rosarito are on identical clocks, but crossing the border is still a full international transition.
The US Navy’s Pacific Fleet is headquartered in San Diego, meaning the city runs on naval time as a deep layer beneath the civilian schedule. The 24-hour military clock, the watch schedules, the tide tables that govern harbor movements: these run in parallel with the civilian time.
beach season and summer evenings
At 32 degrees north, San Diego’s sunset ranges from around 4:45pm in December to 8pm in June. The beach culture is year-round, but the long summer evenings are when Ocean Beach and Mission Beach fully assert themselves.
9am in San Diego is 5pm in London in winter.
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Questions about time in San Diego
- What timezone is San Diego in?
- San Diego is in Pacific Time (PT), using the IANA timezone
America/Los_Angeles. The standard UTC offset is UTC-8 (PST) in winter and UTC-7 (PDT) during daylight saving time. - Does San Diego observe daylight saving time?
- Yes. San Diego observes daylight saving time, shifting from UTC-8 (standard time) to UTC-7 in summer.
- What is the current UTC offset for San Diego?
- San Diego is currently at UTC-7. It is currently observing daylight saving time.
- What is the time difference between San Diego and New York?
- San Diego is currently 3 hours behind New York.
- What is the time difference between San Diego and London?
- San Diego is currently 8 hours behind London.
- What is the time difference between San Diego and Tokyo?
- San Diego is currently 16 hours behind Tokyo. Tokyo does not observe daylight saving time, so this gap changes by 1 hour when San Diego transitions to/from DST.
- What is the IANA timezone name for San Diego?
- The IANA timezone database identifier for San Diego is
America/Los_Angeles. Use this string in programming languages and APIs: JavaScript (`new Intl.DateTimeFormat('en-US', { timeZone: 'America/Los_Angeles' })`), Python (`pytz.timezone('America/Los_Angeles')`), or any IANA-compatible library.