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The 12-hour clock is a time convention in which the 24 hours of the day are divided into two periods: a.m. (from Latin ante meridiem, translating to "before midday") and p.m. (from Latin post meridiem, translating to "after midday"). [1] [2] Each period consists of 12 hours numbered: 12 (acting as 0), [3] 1, 2, 3, 4
[12] Date Time Group format, used most often in operation orders. This format uses DDHHMMZMONYY, with DD being the two-digit day, HHMM being the time on a 24-hour clock, Z being the timezone code, MON being the three-letter month, and YY being the two-digit year. For example, 041200ZFEB23 is noon, UTC, on 4 Feb 2023. [13]
For example, Microsoft Windows and macOS activate the 12-hour notation by default only if a computer is in a handful of specific language and region settings. The 24-hour system is commonly used in text-based interfaces. POSIX programs such as ls default to displaying timestamps in 24-hour format.
Whether the 24-hour clock, 12-hour clock, or 6-hour clock is used. 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.
Returns the hour in 12-hours format for the hour in 24-hour format (between 0 and 24) in parameter: 00 (midnight at start of day) is normally 12 AM for the whole morning hour between 00:00 and 00:59. 01..11 (end of night and morning) is unambiguously 01..11 AM. 12 (noon) is normally 12 PM for the whole afternoon hour between 12:00 and 12:59.
ISO 8601 uses the 24-hour clock system. As of ISO 8601-1:2019, the basic format is T[hh][mm][ss] and the extended format is T[hh]:[mm]:[ss]. Earlier versions omitted the T (representing time) in both formats. [hh] refers to a zero-padded hour between 00 and 24. [mm] refers to a zero-padded minute between 00 and 59.
Digital clocks typically use the 50 or 60 hertz oscillation of AC power or a 32,768 hertz crystal oscillator as in a quartz clock to keep time. Most digital clocks display the hour of the day in 24-hour format; in the United States and a few other countries, a commonly used hour sequence option is 12-hour format (with some indication of AM or PM).
Formats a time of day Template parameters [Edit template data] Parameter Description Type Status Hour hour hh 1 Hour of the day, in 24 hour format Example 13 Auto value Number required Minute minute mm 2 minutes after the hour Example 3 Auto value 0 Number suggested Second second ss sec 3 Seconds after the minute Number optional Hour format hour_format Formats hours and whether to render AM/PM ...