Time and date standards

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

• See the article Calendar standards

Clock and Time 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.

• See the article Clock and Time standards

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 elliptical orbit and are influenced by tidal waves. The Earth rotation around itself are slowly decreasing increasing the length of the day. This among other factors has introduced the leap second.