Virginia observes Eastern Time (ET) (UTC−5 standard, UTC−4 daylight). Alaska observes Alaska Time (AKT) (UTC−9 standard, UTC−8 daylight).
Because both zones shift simultaneously, the difference is always 4 hours year-round.
When it's 12:00 noon in Richmond, VA, it's 8:00 AM in Anchorage, AK.
Note: The Aleutian Islands (west of 169°30′W) observe Hawaii-Aleutian Time (HAT), 5 hours behind ET.