Time difference between Perth and San Francisco

Perth is located in Australia and uses the Australia/Perth timezone (UTC+08:00). San Francisco is located in United States and uses the America/Los_Angeles timezone (UTC-07:00). The time difference between Perth and San Francisco is 15 hours. San Francisco is 15 hours behind Perth.

When planning meetings or calls between Perth and San Francisco, consider the time difference and each city's working hours. The live clocks on this page update every second to show the exact current time in both cities, accounting for daylight saving time automatically.

Perth is not currently observing daylight saving time (UTC+08:00). San Francisco is currently observing daylight saving time (UTC-07:00). The time difference may change when either city transitions into or out of DST.

How this time difference works

The time difference between Perth and San Francisco is calculated by comparing their UTC offsets. Perth uses the Australia/Perth timezone (UTC+08:00) and San Francisco uses the America/Los_Angeles timezone (UTC-07:00). The difference between these offsets gives the time gap.

Both cities may observe daylight saving time, which changes their UTC offset seasonally. The live clocks on this page update every second and automatically account for any DST transitions that may be in effect.

  1. Select Perth and San Francisco from the city lists on the Time Zone Converter.
  2. The tool compares the current UTC offset of both timezones, including any DST adjustments.
  3. The result shows the exact hour difference and which city is ahead or behind.
  4. Use the live clocks to see the current time in both cities side by side.

Examples

Input

12:00 PM in Perth

Output

04:00 in San Francisco

Time difference: 15 hours

Input

9:00 AM in San Francisco

Output

08:00 in Perth

Useful for scheduling morning meetings between the two cities.

Common mistakes when calculating time differences

Watch out for these common errors:

  • Forgetting that DST changes the UTC offset. Perth is not currently in DST, and San Francisco is currently in DST. The time difference may change when DST transitions occur.
  • Assuming the time difference is always a whole number. Some timezones use 30 or 45 minute offsets.
  • Confusing which city is ahead and which is behind. The city further east is always ahead in time.
  • Using fixed offsets instead of IANA timezone identifiers. Fixed offsets do not account for DST.

Frequently asked questions

What is the time difference between Perth and San Francisco?

Perth is in the Australia/Perth timezone (UTC+08:00) and San Francisco is in the America/Los_Angeles timezone (UTC-07:00). The time difference is 15 hours. This difference may change during daylight saving time transitions.

When it's noon in Perth, what time is it in San Francisco?

When it's 12:00 PM in Perth, it's 04:00 in San Francisco. The time difference is 15 hours.

Do Perth and San Francisco have daylight saving time?

Perth is not currently observing DST (UTC+08:00). San Francisco is currently observing DST (UTC-07:00).

Related tools

World ClockSee the current time in cities around the world simultaneously.Time Zone ConverterConvert any time from one timezone to another with a visual timeline.Best Meeting Time CalculatorFind the best meeting time across multiple timezones.Time Zone Difference CalculatorCompare timezones and see working hour overlaps.