How to Convert Times Between Time Zones
If you board a plane in New York at 3 p.m. and head west, you land in San Francisco at 6:40 p.m. despite the fact that you were in the air for almost seven hours. As you crossed the country, you went back in time—or so it seems. In a way you did. During your flight, you went from one time zone into another. To understand how this works, you need to know how to convert between time zones.