#Time zones united states full#

Jet lag is also compounded by the fact that long hours spent on a plane can cause you to sleep too much, or not enough, possibly at the wrong time of day relative to where you departed from. It's caused by rapid travel across time zones. Jet lag is a mismatch between your body clock and the local time wherever you are. If you travel has time zone complexities or possible impacts on your health or comfort, consult an expert as you plan it. If starting the reverse course by midday, you may well arrive but a few clock hours more or less on the same calendar day.west coast to Japan or Hong Kong in late evening can land you there in the morning two calendar days later. Starting a 12–15 hour flight from the U.S.Crossing the International Date Line can cause confusion about on what date you'll arrive, e.g.,:.You may miss important obligations simply by not understanding what will be the correct local time as you travel.Your 'body clock' may experience some stress as you 'tell' it to meet business appointments, tours and other obligations perhaps a few or several hours different from the hours you normally rest.You need to take some care when planning trips that span time zones, e.g.,: (Note: The total span of time zones covers more than 24 hours because the Date Line jogs westward and eastward to keep certain national island groupings on the same calendar day, although they are not within a single time zone.)

#Time zones united states full#

Crossing the Date Line going eastward, clocks are turned back a full 24 hours, and vice versa in the opposite direction. UTC+4) zones west of UTC and east of the Date Line are specified by the number of hours behind UTC (e.g. Time zones east of UTC and west of the International Date Line are specified by the number of hours ahead of UTC (e.g. It comes from the nautical system in which each time zone was assigned a letter. The 'Z' is for 'zero', and 'Zulu' is the two-way radio pronunciation of 'Z'. UTC is also sometimes called Z or Zulu time. UTC used to be called GMT (Greenwich Mean Time), after the Royal Observatory located in the Greenwich area of London.

This is a list of countries, regions, and territories grouped by time zone.Īlthough many time zones have descriptive names used by people in them, they are least ambiguously identified by their relationship to UTC (Universal Time, Co-ordinated).