Time, how much do you know

CET (Central Europe Time):

Central Europe Time (English: European Time,cet) is one of the time zone names that is one hours earlier than world standard Time (UTC). It is used by most European countries and some North African countries.

The winter time is utc+1, and the summer European daylight is utc+2.

WET (Western Europe Time):

Western Europe Time (Western European, abbreviated wet) is the same as world standard Time (UTC).

EU (Eastern Time):

Eastern Europe Time (Eastern European, abbreviation) is one of the time zone names two hours earlier than world standard Time (UTC). It is adopted by some European countries, North African countries and Middle East countries.

UTC (World Standard Time):

Coordinated world time, also known as world standard Time or world coordination time, referred to as UTC (from the English "coordinated Universal time"/French "temps universel cordonné"), is the most important of the world standard, which is based on the atomic time of the second length , at the moment as close to Greenwich as usual.

GMT (Greenwich Normal)

GMT (also known as Greenwich Mean Time or GMT, old to Greenwich Standard Time; English: Greenwich Mean time,gmt) is the standard time for the Royal Greenwich Observatory, located in the outskirts of London, as the prime meridian is defined by the meridians there.

Since February 5, 1924, the Greenwich Observatory has been distributing information to the world on an hourly interval.

In theory, midday at Greenwich Mean time when the Sun crosses the Greenwich Meridian, the highest point over Greenwich. Due to the uneven movement of the Earth in its elliptical orbit, this moment may have an error with the actual sun, with a maximum error of up to 16 minutes.

Since the Earth's daily rotation is somewhat irregular and slows slowly, Greenwich Mean time is no longer used as a standard. The standard time now is the Coordinated Universal Time (UTC), which is produced by atomic clocks.

CST Time

CST can represent 4 different time zones and also represents the standard time for four countries in the United States, Australia, China, and Cuba:

Central United States Time: ut-6:00 (USA)

Central Australia Time: Australia ut+9:30

Chinese Standard Time: ut+8:00

Cuba STD time: Cuba standard times ut-4:00

Therefore, you usually write programs in the process may also encounter JavaScript client time and the server time is inconsistent, the programming time still need to pay more attention.

How ISO dates and times are represented

ISO 8601, the International Organization for Standardization, is a representation of date and time in the form of data storage and interchange, information exchange, and date and time representation. Currently the third edition of Iso8601:2004 replaces the first version of iso8601:1988 with the second version of iso8601:2000.

This is just a representation of a datetime, and we use this method to represent a UTC time.

Time, how much do you know