Because the west is in an earlier time zone than the east. Why is this?
Because as the earth rotates each day, the sun comes up in the east first.
You aren't actually gaining time, but the time is just delayed. Equally, you will lose that emount of time when you travel back east.
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Different regions have different time zones. The hour on the clock changes. You neither lose nor gain time; only the official time, according to the clocks, changes.
We gain flight hours during the travel west to east. So it is better to go to bed later and wake up later not feel jetlags.
You gain an hour when traveling west across time zones because you are moving back in time as you go.
When traveling eastward, you will lose an hour for each time zone you cross because you are moving ahead in time. When traveling westward, you will gain an hour for each time zone you cross because you are moving back in time.
You gain an hour of sleep when Daylight Saving Time ends in November. This is because the clocks are set back by one hour, providing an extra hour for sleep.
if you take off in New Zealand and fly over the international date line and land in Hawaii you fly into yesterday gaining about 16 to 18 hours depending on time of year. And, of course, if you fly in the opposite direction you lose a day. If you travel from west to east across the date line, the next day will be the same day you just lived through. For example, If you crossed the date line on a Wednesday, the next day will be Wednesday again. But if you are traveling from east to west across the date line, and you cross on a Tuesday, than the next day will be Thursday, skipping Wednesday altogether.
When traveling through the eastern hemisphere, you typically "gain" time, meaning you move ahead in time. The exact time difference will depend on the specific locations you are traveling between. This is because the eastern hemisphere includes different time zones that vary in their offset from Coordinated Universal Time (UTC).