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The little-endian format (day, month, year; 1 June 2022) is the most popular format worldwide, followed by the big-endian format (year, month, day; 2006 June 1). Dates may be written partly in Roman numerals (i.e. the month) [citation needed] or written out partly or completely in words in the local language.
A plot of hours of daylight as a function of the date for changing latitudes. This plot was created using the simple sunrise equation, approximating the sun as a single point and does not take into account effects caused by the atmosphere or the diameter of the Sun.
The time of day is sometimes represented as a decimal fraction of a day in science and computers. Standard 24-hour time is converted into a fractional day by dividing the number of hours elapsed since midnight by 24 to make a decimal fraction. Thus, midnight is 0.0 day, noon is 0.5 d, etc., which can be added to any type of date, including (all ...
Forward by 24 hours upon crossing the International Date Line. People traveling eastward must set their clocks: Forward by one hour for every 15° of longitude crossed, and; Back by 24 hours upon crossing the International Date Line. Moving forward or back 24 hours generally also implies a one day date change.
The Julian date (JD) of any instant is the Julian day number plus the fraction of a day since the preceding noon in Universal Time. Julian dates are expressed as a Julian day number with a decimal fraction added. [8] For example, the Julian Date for 00:30:00.0 UT January 1, 2013, is 2 456 293.520 833. [9]
The United States Naval Observatory states "the Equation of Time is the difference apparent solar time minus mean solar time", i.e. if the sun is ahead of the clock the sign is positive, and if the clock is ahead of the sun the sign is negative. [6] [7] The equation of time is shown in the upper graph above for a period of slightly more than a ...
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The 12-hour notation (7:01 pm) is widely used in daily life, written communication, and is used in spoken language. The 24-hour notation (19:01) is used only in rare situations where there would be widespread ambiguity. Examples include plane departure and landing timings. A colon is widely used to separate hours, minutes and seconds (e.g., 14: ...