Difference between revisions of "Time and date standards"

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[[Image:On_Time550.jpg‎|600px|center]]
 
The purpose of this article is to describe the necessary background information to understand time and date issues on the Internet and in computer clocks.
 
The purpose of this article is to describe the necessary background information to understand time and date issues on the Internet and in computer clocks.
 
=Calendar standards=
 
=Calendar standards=
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*See the article [[Calendar standards]]
 
*See the article [[Calendar standards]]
  
=Clock and Time standards=
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=Time clock standards=
The clock are used to describe the time of the day and follows the Earth's rotation around itself. Each day representing one rotation of the Earth.
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The time clock are used to describe the time of the day and follows the Earth's rotation around itself. Each day representing one rotation of the Earth.
*See the article [[Clock and Time standards]]
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*See the article [[Time clock standards]]
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=Time standards=
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Time standards are used to coordinate the time internationally such as GMT, UT, UTC and TAI
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*See the article [[Time standards]]
  
 
=Computer time and date=
 
=Computer time and date=
 
A specific time includes a date and a clock time describing a specific Earth rotation around the Sun and specific Earth rotation around itself. The Earth's rotation around the Sun are influenced by it's elliptical orbit. The Earth rotation around itself called a solar day<ref>[[w:Solar day|Solar day]]</ref> are slowly decreasing, increasing the length of the day.
 
A specific time includes a date and a clock time describing a specific Earth rotation around the Sun and specific Earth rotation around itself. The Earth's rotation around the Sun are influenced by it's elliptical orbit. The Earth rotation around itself called a solar day<ref>[[w:Solar day|Solar day]]</ref> are slowly decreasing, increasing the length of the day.
 
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*See the article [[Computer time]]
==The length of a day==
 
Defined in ISO 8601 the day consists of 24 hours consisting of 60 minutes of 60 seconds. giving a total of <math>24 * 60 * 60 = 86400 seconds</math> a day. With the Earth rotation slowing down there are two possible ways to make the clock time match the rotation of the Earth.
 
#Decreasing the length of the second to match 86400 second/day
 
#Introducing a leap second<ref>[[w:Leap_second|Leap_second]]</ref> when needed.
 
  
 
=References=
 
=References=
 
<references/>
 
<references/>
 
[[Category:Time]]
 
[[Category:Time]]

Latest revision as of 11:39, 9 July 2013

On Time550.jpg

The purpose of this article is to describe the necessary background information to understand time and date issues on the Internet and in computer clocks.

Calendar standards

In the western world we are using the Gregorian calender which is a solar calendar following the seasons and the Earth's orbit around the Sun

Time clock standards

The time clock are used to describe the time of the day and follows the Earth's rotation around itself. Each day representing one rotation of the Earth.

Time standards

Time standards are used to coordinate the time internationally such as GMT, UT, UTC and TAI

Computer time and date

A specific time includes a date and a clock time describing a specific Earth rotation around the Sun and specific Earth rotation around itself. The Earth's rotation around the Sun are influenced by it's elliptical orbit. The Earth rotation around itself called a solar day[1] are slowly decreasing, increasing the length of the day.

References