What is the difference between PDT and UTC?
PDT is 7 hours behind UTC. PDT (Pacific Daylight Time) is used during Daylight Saving Time in the Pacific time zone, typically from March to November.
UTC time
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PDT
Pacific Daylight Time
17 Dec 2025
Frequently Asked Questions
Does this area observe DST?
PDT itself is the daylight saving time version of PST. PDT is observed from the second Sunday in March to the first Sunday in November, when the region switches back to PST (Pacific Standard Time, UTC-8:00).
Which major cities follow this pattern?
Cities such as Los Angeles, San Francisco, Seattle, Portland, and Vancouver follow PDT during the summer months.
What areas share the same hours?
Parts of the western United States (California, Washington, Oregon, Nevada) and Canada (British Columbia) observe PDT during daylight saving time.
How does this compare with PST?
PDT is 1 hour ahead of PST. PDT (UTC-7:00) is used during summer months, while PST (UTC-8:00) is used during winter months.
Why does this area observe DST?
Daylight saving time is observed to make better use of daylight during the longer summer days, potentially reducing energy consumption and allowing for more evening activities.
How did this system get established?
PDT was established as part of the daylight saving time system adopted in the United States and Canada, beginning in the early 20th century to conserve energy during World War I.
What are the typical work hours here?
Work hours in areas following PDT are generally from 9:00 AM to 5:00 PM, with a lunch break in the middle of the day.
What is the economic importance of this area?
The Pacific region includes major economic hubs like Silicon Valley, Hollywood, and the Pacific Northwest tech industry, making it one of the most economically significant regions in North America.