What are the time zones in the U.S.A? I know I live in the EST but don't know the time zones (difference ) in Californa~is it MST? Ty?

No, it is PST, and since the entire continental USA and Canada went onto daylight saving time at 2 am local time on Sunday, March 8, 2020, except for Arizona, you're now in EDT and California AND Arizona are in PDT, 3 hours earlier. Hawaii does not observe DST. Alaska does. Arizona is MST year round except for the Indian reservations.

Eastern standard /daylight time EST/EDT

Central standard/daylight time CST/CDT

(Most of Indiana observes EDT except for 7 counties.)

Mountain standard/daylight time NST/MDT.

Pacific standard/daylight time PST/PDT

Alaska standard/daylight time.

Atlantic, (US Virgin Islands and Puerto Rico)

Eastern, Central, Mountain, Pacific, Alaska, Hawaii (includes the Aleutian islands)

In the Continental United States there are four time zones.

Eastern (GMT+5),  Central (GMT+6), Mountain (GMT+7) and Pacific (GMT+8)

GMT is Greenwich Mean Time (Greenwich England) GMT+5  means you add five hours to Eastern time to obtain GMT.

Besides the standard Time Zones listed above you have Daylight Savings Time or summer time.

Google is your friend.