The time zones PST (Pacific Standard Time) and PDT (Pacific Daylight Time) are both in the Pacific time zone. However, they are different because PST is based on UTC-8, while PDT is based on UTC-7. This means that there is an hour of difference between PST and PDT. If it is currently noon in Los Angeles, which is in the PST time zone, then it is actually 11am in San Francisco, which is in the PDT time zone. In other words, the PDT time zone is one hour behind the PST time zone.
What is PST?
PST, or Pacific Standard Time, is the time zone that is eight hours behind Greenwich Mean Time (GMT-8).
- PST is used in the following states: California, Nevada, Oregon, Washington, and Idaho. In PST, the sun rises at 8:00 AM and sets at 5:00 PM. PST is also referred to as “Pacific Daylight Time” when daylight savings time is in effect.
- When PST is not in daylight savings time, it becomes “Pacific Standard Time.” PST happens during fall and winter when GMT-8 becomes GMT-7. PST begins on the first Sunday of November and ends on the second Sunday of March.
- This change happens at 2:00 AM PST when clocks are moved forward one hour. During PST, there are 23 hours of daylight and 1 hour of darkness.
What is PDT?
PDT, or Photodynamic Therapy, is a type of cancer treatment that uses light to kill cancer cells.
- PDT begins with the application of a photosensitizer, or light-sensitive drug, to the skin. Once the drug has been absorbed by the cancer cells, it is exposed to a specific wavelength of light.
- This light activates the photosensitizer, causing it to produce a chemical reaction that kills the cancer cells. PDT is typically used to treat superficial cancers, such as those of the skin or lining of the stomach.
- It can also be used to treat more aggressive cancers, such as pancreatic cancer. PDT is often used in combination with other cancer treatments, such as surgery or chemotherapy.
Difference between PST and PDT
PST and PDT are two time zones in the United States.
- PST is Pacific Standard Time and is UTC-8, while PDT is Pacific Daylight Time and is UTC-7. PST is used in winter, while PDT is used in summer.
- The reason for this is that in winter, the sun sets earlier in PST than in PDT, while in summer, the sun sets later in PST than in PDT.
- This is because PST is based on the mean solar time of the 120th meridian west of Greenwich, while PDT is based on the mean solar time of the 105th meridian west of Greenwich.
As a result, PST is eight hours behind UTC while PDT is seven hours behind UTC. In other words, when it is noon PST, it is 8pm UTC, while when it is noon PDT, it is 7pm UTC.
Conclusion
The difference between Pacific Standard Time (PST) and Daylight Saving Time (DST) can be confusing for many people. In the United States, PST is observed in California, Oregon, and Washington. DST is observed in Arizona, Hawaii, Idaho, Nevada, Utah, and Montana. This time zone difference can cause some confusion when scheduling or traveling. Hopefully, this article has cleared up any questions you may have had about the two time zones.
