PST is 3h behind EDT when Pacific is on PDT; 4h behind when on PST.

The time difference between Eastern Daylight Time (EDT) and Pacific Standard Time (PST) is 4 hours. PST is 4 hours behind EDT. During Daylight Saving Time, PST becomes PDT (Pacific Daylight Time, UTC-7:00), which is 3 hours behind EDT.

EDT (Eastern Daylight Time, UTC-4:00) is used in the eastern United States during Daylight Saving Time, typically from March to November. PST (Pacific Standard Time, UTC-8:00) is used in the western United States during standard time, typically from November to March. When both regions observe DST, the difference becomes EDT (UTC-4:00) vs PDT (UTC-7:00), which is 3 hours.

Here are some common time conversions:

9:00 AM EDT = 5:00 AM PST
12:00 PM (noon) EDT = 8:00 AM PST
3:00 PM EDT = 11:00 AM PST
6:00 PM EDT = 2:00 PM PST
9:00 PM EDT = 5:00 PM PST
12:00 AM (midnight) EDT = 8:00 PM PST (previous day)

EDT is used in eastern US states like New York, Florida, Georgia, and most of the East Coast during Daylight Saving Time. PST is used in western US states like California, Washington, Oregon, and Nevada during standard time. The 4-hour difference (or 3 hours during DST) makes it easy to coordinate meetings and calls between these regions.