well it begins somewhere around march
The answer would depend on whether it is during the observation of daylight savings time or not. When the clocks spring ahead 1 hour in the spring, you begin to use PDT (Pacific Daylight Time). When the clocks fall back an hour in the fall daylight savings time is over and then you begin to use PST (Pacific Standard Time).
eastern7am Pacific Daylight Savings Time.
9 AM Pacific Daylight Saving Time = noon Eastern Daylight Saving Time 9 AM Pacific Standard Time (Clipperton Island) = 1 PM EDT
20.00 hours BST - is 12.00 noon Pacific Daylight saving - Pacific is 8 hours behind London
10 AM Eastern Daylight Saving Time = 6 AM Pacific Standard Time = 7 AM Pacific Daylight Saving Time 10 AM Eastern Standard Time = 7 AM Pacific Standard Time = 8 AM Pacific Daylight Saving Time -HW 6:00am pacific time (the floating time zone)
3am Pacific Daylight Time is equivalent to 4am Mountain Daylight Time. Mountain Time Zone is two hours ahead of Pacific Time Zone during daylight saving time.
4 PM Eastern Daylight Saving Time = noon Pacific Standard Time = 1 PM Pacific Daylight Saving Time4 PM Eastern Standard Time = 1 PM Pacific Standard Time = 2 PM Pacific Daylight Saving Time-HW
10 AM Mountain Daylight Saving Time = 8 AM Pacific Standard Time = 9 AM Pacific Daylight Saving Time 10 AM Mountain Standard Time = 9 AM Pacific Standard Time = 10 AM Pacific Daylight Saving Time
Eastern daylight time is three hours ahead of the pacific daylight time.
10 PM Pacific Daylight Saving Time = midnight Eastern Standard Time = 1 AM Eastern Daylight Saving Time10 PM Pacific Standard Time = 1 AM Eastern Standard Time = 2 AM Eastern Daylight Saving Time
10 PM Pacific Daylight Saving Time = midnight Eastern Standard Time = 1 AM Eastern Daylight Saving Time10 PM Pacific Standard Time = 1 AM Eastern Standard Time = 2 AM Eastern Daylight Saving Time
It is 4 hours.