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[17] The separator used between date values (year, month, week, and day) is the hyphen, while the colon is used as the separator between time values (hours, minutes, and seconds). For example, the 6th day of the 1st month of the year 2009 may be written as "2009-01-06" in the extended format or as "20090106" in the basic format without ambiguity.
The day is divided into 10 16 (16 10) hexadecimal hours, each hour into 100 16 (256 10) hexadecimal minutes, and each minute into 10 16 (16 10) hexadecimal seconds. History [ edit ]
Fractional days are often calculated in UTC or TT, although Julian Dates use pre-1925 astronomical date/time (each date began at noon = ".0") and Microsoft Excel uses the local time zone of the computer. Using fractional days reduces the number of units in time calculations from four (days, hours, minutes, seconds) to just one (days).
When dealing with periods that do not encompass a UTC leap second, the difference between two Unix time numbers is equal to the duration in seconds of the period between the corresponding points in time. This is a common computational technique. However, where leap seconds occur, such calculations give the wrong answer.
Whether the minutes (or fraction of an hour) after the previous hour or until the following hour is used in spoken language. The punctuation used to separate elements in all-numeric dates and times. Which days are considered the weekend.
Some file archivers and some version control software, when they copy a file from some remote computer to the local computer, adjust the timestamps of the local file to show the date/time in the past when that file was created or modified on that remote computer, rather than the date/time when that file was copied to the local computer.
The word y ("and") is used to denote minutes past or after the hour (e.g. las cinco y diez for "ten minutes past five"). If more than thirty minutes have elapsed since the last full hour, minutes to the hour are expressed using the word menos ("minus") (e.g. las diez menos cinco; "five minutes to ten").
To separate the hours, minutes and seconds, either a point or a colon can be used. For 12-hour time, the point format (for example "1.45 p.m.") is in common usage and has been recommended by some style guides, including the academic manual published by Oxford University Press under various titles, [ 8 ] as well as the internal house style book ...