Understanding EST and PST
EST stands for Eastern Standard Time, UTC−5, used in Eastern North America. PST stands for Pacific Standard Time, UTC−8, used in Western North America. These are specific offset definitions, not automatic substitutes for the local time in a city.
How do you convert EST to PST?
Subtract the source offset from the destination offset: -480 − (-300) = -180 minutes. Subtract 180 minutes from the EST time. For example, 9:00 AM EST is 6:00 AM PST (same day). If the result crosses midnight, the calendar day changes too.
Does daylight saving time change this conversion?
The difference between these named offsets is fixed. A location may switch to a different abbreviation during daylight saving time, so an invitation saying “EST” can differ from the actual summer time in New York.
EST is always UTC−5. New York and most US Eastern locations use EDT (UTC−4) during daylight saving time.
PST here means North American Pacific Standard Time. Most US Pacific locations use PDT (UTC−7) in summer.
Which day does the converted time fall on?
“Previous day” means the destination is one calendar day before the source; “Next day” means one day after. Dates are relative to the day of your input time. A time-only conversion cannot determine a specific calendar date.