Difference Between PST and PDT

The Pacific Time Zone is one of the 25 times zones available currently covers parts of the United States of America, Canada and Mexico.

These places have their standard time calculated as Universal Time – 8 Hours. Universal Time is also called as Coordinated Universal Time, which is the successor of GMT.


The main difference between PST and PDT is that PST is the standard time followed during November and mid-March while PDT is followed from mid-March to November.


In short, PST is followed during the winter months and PDT is followed during the summer months of a calendar year. PDT is kept one hour ahead of the PST to observe longer days.

PST is followed in a particular season and another time zone exists that is 7 hours behind the Universal Time called PDT, this is followed in a certain period apart from PST.

PST and PDT are followed one after the other in a calendar year. PST surpasses to the next calendar year while PDT is observed in the same year.


Comparison Table Between PST and PDT (in Tabular Form)

Parameter of ComparisonPacific Standard TimePacific Daylight Time
DefinitionPacific Standard Time is the time followed during the Winter. It is followed in the countries of the US, Canada and Mexico.Pacific Daylight Time is followed during the Summer in the same places where PST is followed.
Time FramePST is followed from Early November to Mid MarchPDT is followed from Mid March to Early November
UTC Difference8 hours behind UTC7 Hours Behind UTC
Time DifferenceIt is the standard time and it remains the same.Time is kept one hour ahead of PST.
BenefitsShorted Winter DaysLonger Summer days and Energy shall be conserved.


What is PST?

Pacific Standard Time is the is the time zone followed in some parts of Canada, the United States and Mexico. It is the standard time that is followed during the Winter season.

Ideally, the months that they follow the PST is from Early November of every year to the Mid of March the next year. In Winter, the PST is 8 hours behind the Universal Time.

It is observed that Pacific Standard Time is used in Winter to reduce the day. There are places in the countries mentioned that completely follows the PST.

In Canada, only Yukon is completely under the Pacific Time Zone. Further, the Northwest Territories and British Columbia partially follow while the other parts follow the Mountain Zone.

In the United States of America, two states completely fall under Pacific Standard Time. They are California and Washington. As with parts of Canada, few states in the US is also split among PST and Mountain Time Zone.


What is PDT?

Pacific Daylight Time is the time zone followed during the Summer months in the places where PST is followed. It is again followed in Canada, United States and Mexico.

PDT is the other way around PST in following the time zone. It begins from Mid March every year and gets over the Early November in the same year.

The Energy Policy act of 2005 passed by the Government of the US altered the dates of PDT that was followed for many years. The policy states to change the time one hour ahead on the second Sunday of March every year.

Subsequently, PDT is set back to PST on the First Sunday in November. Earlier it was 1st Sunday in the April to Last Sunday in October.


Main Differences Between PST and PDT

  • The two time zones belong to the same locations however the main difference between PST and PDT is, PST is followed during Winter while PDT is followed during the Summer.
  • Pacific Standard Time begins from Early November of every year, it continues till the mid of March next year. Pacific Daylight Time begins in the Mid of March and extends till early November.



The Earth’s geographical dimensions have given rise to the time zones. Understanding the concept of Time zones is no rocket science, but it sounds fairly impractical to follow the time difference for a few months.

Of course, Government policy is to be followed, but the energy-saving aspect is what is retaliated by many forums after the Energy Policy of 2005. If daylight to be saved during Summer and save energy, so what can happen during winter, people may use more energy as it is winter and as well as gets darker quickly.

Key Differences Between PST and PDT (PDF Format)

Download the key differences in .PDF format, to read or print them later:

Difference Between PST and PDT
AskAnyDifference HomeClick here
Search for "Ask Any Difference" on Google. Rate this post!
[Total: 0]
One request?

I’ve put so much effort writing this blog post to provide value to you. It’ll be very helpful for me, if you consider sharing it on social media or with your friends/family. SHARING IS ♥️

Notify of
Inline Feedbacks
View all comments