When were time zones first used?

On November 18, 1883, America’s railroads began using a standard time system involving four time zones, Eastern, Central, Mountain and Pacific. Within each zone, all clocks were synchronized.

What were time zones created for?

The expansion of transport and communication during the 19th century created a need for a unified time-keeping system, and time zones were introduced. Time zones have a long history. Before clocks were invented, people kept time using different instruments to observe the Sun’s meridian passing at noon.

How was time measured in ancient times?

The earliest method of measuring time was through observation of the celestial bodies – the sun, moon, stars and the five planets known in antiquity.

What is your time zone?

Time Zones Currently Being Used in United States

Offset	Time Zone Abbreviation & Name
UTC -8	PST	Pacific Standard Time
UTC -7	MST	Mountain Standard Time
UTC -6	CST	Central Standard Time
UTC -5	EST	Eastern Standard Time

What do the time zones mean?

A time zone is a region of the Earth that has adopted the same standard time, usually referred to as the local time. Most adjacent time zones are exactly one hour apart, and by convention compute their local time as an offset from Greenwich Mean Time (see also UTC).

What time is it in different time zones?

Generalized Time Zones in United States

Time Zone Abbreviation & Name	Current Time
PT	Pacific Time	Wed, 8:43:55 pm
MT	Mountain Time	Wed, 9:43:55 pm
CT	Central Time	Wed, 10:43:55 pm
ET	Eastern Time	Wed, 11:43:55 pm