Difference between revisions of "Calendar standards"
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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. | ||
=Western time standards= | =Western time standards= | ||
| − | The western time standards dividing the year into 12 months, the day into 24 hours, the hour into 60 minutes and the hour into 60 seconds derived from the | + | The western time standards dividing the year into 12 months, the day into 24 hours or 12 hours AM and 12 hours PM, the hour into 60 minutes and the hour into 60 seconds derived from the Mesopotamia<ref>[[w:Mesopotamia#Mathematics|Mesopotamia Mathematics]]</ref> using the sexagesimal<ref>[[w:Sexagesimal|Sexagesimal or base 60 numeral system]]</ref> or base 60 numeral system. |
| − | + | :'''Note:''' The base 60 systems is a highly composite number as 1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30 and 60 are factors. | |
| + | ==Julian calendar== | ||
| + | The Julian calendar<ref>[[w:Julian calendar|Julian calendar]]</ref> was introduced by Julius Caesar in 46 BC and was the dominant calendar in the western world, until it was superseded by the Gregorian calendar. | ||
| + | ===Leap year=== | ||
| + | The Julian calendar has 12 months, 365 days and a leap day added in February every four years giving an average year of 365,25 days. | ||
==Gregorian calendar== | ==Gregorian calendar== | ||
I the western world we are following the Gregorian calendar<ref>[[w:Gregorian calendar|Gregorian calendar]]</ref> also called the Western or the Christian calendar. The Gregorian calendar is internationally the most widely accepted calendar and are used as ''civil'' calendar. | I the western world we are following the Gregorian calendar<ref>[[w:Gregorian calendar|Gregorian calendar]]</ref> also called the Western or the Christian calendar. The Gregorian calendar is internationally the most widely accepted calendar and are used as ''civil'' calendar. | ||
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=References= | =References= | ||
<references> | <references> | ||
Revision as of 08:07, 5 July 2013
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.
Contents
Western time standards
The western time standards dividing the year into 12 months, the day into 24 hours or 12 hours AM and 12 hours PM, the hour into 60 minutes and the hour into 60 seconds derived from the Mesopotamia[1] using the sexagesimal[2] or base 60 numeral system.
- Note: The base 60 systems is a highly composite number as 1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30 and 60 are factors.
Julian calendar
The Julian calendar[3] was introduced by Julius Caesar in 46 BC and was the dominant calendar in the western world, until it was superseded by the Gregorian calendar.
Leap year
The Julian calendar has 12 months, 365 days and a leap day added in February every four years giving an average year of 365,25 days.
Gregorian calendar
I the western world we are following the Gregorian calendar[4] also called the Western or the Christian calendar. The Gregorian calendar is internationally the most widely accepted calendar and are used as civil calendar.