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Timekeeping convention
The modern 24-hour clock is the convention of timekeeping in which the day runs from midnight to midnight and is divided into 24 hours. This is indicated
24-hour_clock
Time counting system
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
12-hour_clock
Clock or watch face showing the full 24 hours
Clocks and watches with a 24-hour analog dial have an hour hand that makes one complete revolution—360°—in a full day, or 24 hours per revolution. In contrast
24-hour_analog_dial
Thai timekeeping system
official 24-hour clock. Like other common systems, it counts twenty-four hours in a day, but it divides the day into four quarters, counting six hours in each
Thai_six-hour_clock
time using the 24-hour clock (02:40) for maximum clarity in both Canadian English and Canadian French, but also allows the 12-hour clock (2:40 a.m.) in
Date and time notation in Canada
Date_and_time_notation_in_Canada
Historic timekeeping system
24-hour clock. In this system, the day starts at the evening, at the end of twilight, approximately half an hour after sunset, and the following 24 hours
Italian_six-hour_clock
Dial of an analogue clock or watch
digital clocks and watches. A second type of clock face is the 24-hour analog dial, widely used in military and other organizations that use 24-hour time
Clock_face
Instrument for measuring, keeping or indicating time
(the study of timekeeping), the term clock was used for a striking clock, while a clock that did not strike the hours audibly was called a timepiece. This
Clock
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
Date and time representation by country
Date_and_time_representation_by_country
Clock that sounds the time with a bell or gong
clock in Syria was a 12-hour clock, many early clocks struck up to 24 strokes, particularly in Italy, where the 24-hour clock, keeping Italian hours,
Striking_clock
31/12/1999). The time can be written using either the 24-hour clock (23:59) or the 12-hour clock (11:59 p.m.), either with a colon or a full stop (11.59 p
Date and time notation in the United Kingdom
Date_and_time_notation_in_the_United_Kingdom
format (2026-07-31) for all-numeric dates, write the time using the 24-hour clock (10:51), and notate the date using a day–month–year format (31 July
Date and time notation in the United States
Date_and_time_notation_in_the_United_States
systems of telling time in Thailand. Official time follows a 24-hour clock. The 24-hour clock is commonly used in military, aviation, navigation, meteorology
Date and time notation in Thailand
Date_and_time_notation_in_Thailand
Unit of time equal to 60 minutes
o'clock".) Hours on a 24-hour clock ("military time") are expressed as "hundred" or "hundred hours". (1000 is read "ten hundred" or "ten hundred hours"; 10
Hour
Canadian railway engineer Sandford Fleming, who pioneered the use of the 24-hour clock, the world's time zone system, and a standard prime meridian. The National
Time_in_Canada
Device to measure the passage of time
An hourglass (or sandglass, sand timer, or sand clock) is a device used to measure the passage of time. It comprises two glass bulbs connected vertically
Hourglass
English phrase
of the clock's strokes as then they could also be wrong. Within the 24-hour clock system used for official and technical purposes throughout most of the
Thirteenth stroke of the clock
Thirteenth_stroke_of_the_clock
Clock regulated by a pendulum
A pendulum clock is a clock that uses a swinging weight known as a pendulum as its timekeeping element. The pendulum is an approximate harmonic oscillator
Pendulum_clock
Film by video artist Christian Marclay
The Clock is a film by video artist Christian Marclay. It is a looped 24-hour video supercut of scenes from film and television that feature clocks or
The_Clock_(2010_film)
Time of day using decimal units
Commons has media related to French Republican decimal time. 12-hour clock 24-hour clock Centesimal minute and second of arc Decimal calendar Hexadecimal
Decimal_time
Electromechanical, digital timekeeping device
in a 24-hour clock. Having two sets of leaves for each hour also allows the clock to alternate between 12- and 24-hour display, every half hour, like
Flip_clock
Biological mechanism that controls circadian rhythm
and is synchronized with solar time. Such a clock's in vivo period is necessarily almost exactly 24 hours (the earth's current solar day). In most living
Circadian_clock
and 1957 to 1964. Polish people use both the 12-hour clock and 24-hour clock, though the 12-hour clock is more commonly used in speech when unambiguous
Time_in_Poland
Mechanical clock that has been made to tell traditional Japanese time
to display Japanese hours on clock faces. Some had movable hours around the rim of a 24-hour clock dial. Others had multiple clock faces that could be
Japanese_clock
December 1999 or 31-12-1999, 31/12/'99). The time is written in the 24-hour clock format (23:59). In the Netherlands, dates are written using the little-endian
Date and time notation in the Netherlands
Date_and_time_notation_in_the_Netherlands
written and formal contexts, the 24-hour clock is used to express time, using a colon (":") as the separator between hours and minutes, for example, 14:05
Date and time notation in Rwanda
Date_and_time_notation_in_Rwanda
Clock displaying astronomical information
could display. Astronomical clocks vary in design, but share some common features. Most astronomical clocks have a 24-hour analog dial around the outside
Astronomical_clock
time is written using the 24-hour clock (01:17 or 01 h 17 min); in spoken language and informal contexts the 12-hour clock is also commonly adopted. In
Date and time notation in Brazil
Date_and_time_notation_in_Brazil
Topics referred to by the same term
Time, rather than a local time zone the null character Midnight in 24-hour clock This disambiguation page lists articles associated with the same number
0000
are generally written using 24-hour clock notation, with full stops (dots or periods) as separators, although 12-hour clock notation is more frequently
Date and time notation in Sweden
Date_and_time_notation_in_Sweden
Primary time standard globally used to regulate clocks and time
ensures that all pilots, regardless of location, are using the same 24-hour clock, thus avoiding confusion when flying between time zones. See the list
Coordinated_Universal_Time
(03:00 CEST). Sweden adopted CET in 1900. Times are written with the 24-hour clock, with colon as separators. Historically full stops were more common
Time_in_Sweden
Topics referred to by the same term
24 Hours or Twenty Four Hours may also refer to: 24 Hours (1931 film), a 1931 drama 24 Hours (2000 film), a Russian film 24 Hours (2002 film), a Croatian
24_Hours
time. Systematic use of the 24-hour clock by German radio and TV announcers, along with the proliferation of digital clocks, may have been a significant
Date and time notation in Europe
Date_and_time_notation_in_Europe
of 24-hour broadcasting. TV3 started 24-hour broadcasting on that time as the first 24-hour broadcasting in Malaysia and resumed 24-hour clock broadcasting
TV3_(Malaysian_TV_network)
Clock tower in London, England
37:23–24, are: "All through this hour/Lord be my guide/And by Thy power/No foot shall slide". They are written on a plaque on the wall of the clock room
Big_Ben
Hour system with days divided into 24 hours
1300. The terms a.m. and p.m. are still used in the 12-hour clock, as opposed to the 24-hour clock. Ancient Rome portal Byzantine time – 0:00:00 begins
Roman_timekeeping
Medical condition
natural light–dark cycle. Non-24-hour sleep–wake disorder causes a person's sleep–wake cycle to move around the clock every day, to a degree dependent
Non-24-hour sleep–wake disorder
Non-24-hour_sleep–wake_disorder
written and spoken formats. Official time is given using the 24-hour clock, and the 12-hour clock is often used in informal speech. "Seis de diciembre de mil
Date and time notation in Spain
Date_and_time_notation_in_Spain
example, 31/12/1992. The 24-hour clock is used to express time, using the lowercase letter "h" as the separator in between hours and minutes, for example
Date and time notation in France
Date_and_time_notation_in_France
Turkey, the little endian date format is used, and 24-hour clock is more common than the 12-hour clock system. The system is also used in the unrecognized
Date and time notation in Turkey
Date_and_time_notation_in_Turkey
British medical television series
the clock for 28 days, 24 hours a day in A&E (Accident and Emergency). It offers unprecedented access to one of Britain's busiest A&E departments. 24 Hours
24_Hours_in_A&E
World history app for iPad
years) is scaled into a 24-hour clock. Navigation is possible by browsing several timelines or by rewinding the pointers of a clock to go back in time. The
Back_in_Time_(iOS_software)
advancing the clock forward one hour at 3:00 am EET on the last Sunday in March and back at 4:00 am EET on the last Sunday in October, doing so an hour earlier
Time_in_Finland
1941 and 1946, and again since 1983. Slovenia uses both the 12-hour and 24-hour clock.[citation needed] In the IANA time zone database, Slovenia is given
Time_in_Slovenia
Available 24 hours a day, seven days a week
and industry, 24/7 or 24-7 service (usually pronounced "twenty-four seven") is service that is available at any time of day, 24 hours, and every day
24/7_service
Line dividing one calendar day from the next
around the world must set their clocks: Back by one hour for every 15° of longitude crossed, and Forward by 24 hours upon crossing the International Date
International_Date_Line
Topics referred to by the same term
30 Hours or 30-hour clock may refer to: 30 Hours, a song by American rap musician Kanye West Muhurta, a Hindu unit of measurement for time Date and time
30-hour_clock
Historic clock on the Spasskaya Tower
chimes have rung on the quarter-hour, with bells tolling for each full hour. The clock face of the Spasskaya Tower clock, was formerly divided into 17 equal
Kremlin_Clock
12/7/2026). The time is written using the 24-hour clock (03:03); in spoken language and informal contexts, the 12-hour clock is more commonly adopted, but without
Date and time notation in Italy
Date_and_time_notation_in_Italy
Annual sports car race held in France
The 24 Hours of Le Mans (French: 24 Heures du Mans; French pronunciation: [vɛ̃t.katʁ‿œʁ dy mɑ̃]) is an endurance sports car race held annually near the
24_Hours_of_Le_Mans
turbines, diesels, etc.) For demand period measures and not for the full 24-hour clock. Industry Development of GADS Before any data element was included in
Generating Availability Data System
Generating_Availability_Data_System
Time zone used in the Philippines (UTC+08:00)
(dd mm yyyy) Standard: 12-hour clock Military/Scouting: US Military Time Public Transport and Marathon events: 24-hour clock Common spoken language Tagalized
Philippine_Standard_Time
Clock that displays the time in a binary format
value, but presently binary clocks also exist which display hours, minutes, and seconds as binary numbers. Most binary clocks are digital, although analog
Binary_clock
hh:mm are also acceptable formats. The 24-hour clock can be used in both formal and informal use, but the 12-hour clock is used more in informal use. The Hungarian
Date and time notation in Hungary
Date_and_time_notation_in_Hungary
2026). The time is written using the 24-hour clock (17.32); in spoken language and informal contexts, the 12-hour clock is more commonly adopted, but without
Date and time notation in Finland
Date_and_time_notation_in_Finland
24-hour clock is almost exclusively used in writing, while spoken language is dominated by the 12-hour clock, usually without noting whether the hour
Time_in_Serbia
clock dated to this year) is the earliest such large clock known. The clock has not survived. The first clock known to strike regularly on the hour,
History of timekeeping devices
History_of_timekeeping_devices
written language, the time of day is usually expressed using the 24-hour clock. Hours and minutes are separated using either a colon or a full stop. Leading
Time_in_Croatia
Telecommunications tower in Germany
is the largest digital clock in the world. The clock is a 24-hour clock with six sets of lights, two each for the Hour (00 to 24), Minutes (00 to 60),
Rheinturm
Computation modulo a fixed integer
exhibiting modular arithmetic is the hour hand on a 12-hour clock. If the hour hand points to 7 now, then 8 hours later it will point to 3. Ordinary addition
Modular_arithmetic
Digital watch produced since 1989
day of the week, day of the month, hour, minute, seconds and the signs PM in the afternoon – or 24H (24-hour clock) – at all times, the alarm signal status
Casio_F-91W
Information identifying when an event occurred
ISO 8601 Timestamp: A time of day, for example 04:57:05 (using the 24-hour clock) Date-timestamp: Date and time, for example 2026-08-02T04:57:05 (ISO
Timestamp
Daylight saving time was first introduced on 1 May 1916; the clock moved forwards one hour at 00:00 to UTC+01:19:32.13, and moved back on 1 October at
Time_in_the_Netherlands
Timekeeping before Shixian calendar
(黄昏; 黃昏), rest time (定昏). These correspond to each hour from 06:00 to 20:00 on the 24-hour clock. The system used between the Eastern Han and Ming dynasties
Traditional Chinese timekeeping
Traditional_Chinese_timekeeping
Welsh guitarist (1967–1995)
the bridge was located and he confirmed the software printed out the 24-hour clock, meaning Edwards passed this location at 2:55 am. Therefore, the timeline
Richey_Edwards
12 o'clock in the daytime
methods of representing these times are: to use a 24-hour clock (00:00 and 12:00, 24:00; but never 24:01) to use "12 noon" or "12 midnight" (though "12
Noon
Public clock in Berlin, Germany
utilizes 24 light fields (1+4+4+11+4=24) to display time in 0–23 hour, 0–59 minute and even/odd second. The clock is read from the top row to the bottom
Mengenlehreuhr
is not granted a zone.tab entry on the IANA time zone database. The 24-hour clock is used. Time in Europe Time in Serbia Time in Albania Time in Bosnia
Time_in_Kosovo
Scottish-Canadian engineer and inventor (1827–1915)
promoted worldwide standard time zones, a prime meridian, and use of the 24-hour clock as key elements to communicating the accurate time, all of which influenced
Sandford_Fleming
using the day–month–year format (26 July 2026) and the 12-hour clock (4:43 am), although 24-hour time is used in some cases. For example, some public transport
Date and time notation in Australia
Date_and_time_notation_in_Australia
Punctuation to signal the end of a sentence (.)
ultimately Qantas. In British English, whether for the 12-hour clock or sometimes its 24-hour counterpart, the dot is commonly used and some style guides
Full_stop
Transition time from one day to the next
local official clock time for any particular jurisdiction. By clock time, midnight is the opposite of noon, differing from it by 12 hours. Solar midnight
Midnight
Relative direction using a dial
A clock position, or clock bearing, is the direction of an object observed from a vehicle, typically a vessel or an aircraft, relative to the orientation
Clock_position
Network of emergency sirens installed around Singapore
24-hour clock, coinciding with the year 2020. to signal the Pledge Moment and on National Day 2025 at 8:19pm was read as 2019hrs in the 24-hour clock
Public Warning System (Singapore)
Public_Warning_System_(Singapore)
Clock that displays the times in various locations around the globe
A world clock is a clock which displays the time for various cities around the world. The display can take various forms: The clock face can incorporate
World_clock
Identifier for a time offset from UTC of +9
sign] says move your clocks back 45 minutes. We say we're not that smart really so we just go with one hour, so we're one hour on from WA," he said.
UTC+09:00
Medieval astronomical clock in the Czech Republic
The Prague astronomical clock, or Prague Orloj (Czech: Pražský orloj [praʃskiː orloj]), is a medieval astronomical clock attached to the Old Town Hall
Prague_astronomical_clock
Person who tends to stay awake at night
doing so. The body follows a circadian rhythm; the body's internal 24-hour clock which responds to natural environmental cues like sunlight and regulates
Night_owl
Mecha-based video game series
arc. The game is structured around a 24-hour clock that moves forward as missions progress. At the end of the 24-hour period, choices made by the player
Armored_Core
gained independence in 2006.[citation needed] Montenegrins use the 24-hour clock. In the IANA time zone database, Montenegro is given the zone Europe/Podgorica
Time_in_Montenegro
1970 single by Bobby Goldsboro
to the Mickey Mouse watches which were popular at the time. (In the 24-hour clock, 1300 is 1:00 p.m., but the song's reference is to the boy's inability
Watching_Scotty_Grow
the wee hours") when needed; written communication uses 24-hour clock almost universally, including written forms of informal speech. 24-hour times will
Date and time notation in Poland
Date_and_time_notation_in_Poland
International maritime signal flag
Time (UTC)+0 (also known as Greenwich Mean Time (GMT)) expressed on a 24 hour clock. Thus this would mean 0800Z ("zero eight hundred zulu") equivalent to
Z_flag
1965 novel by Michael Frayn
the security officer has a mania with sport, doesn't understand the 24-hour clock and is constantly confusing himself with his own elaborate codes, the
The_Tin_Men
8601, but it is not widely used. Written time is almost always in the 24-hour clock. In spoken language, a mixture of the two systems are used: When giving
Date and time notation in Denmark
Date_and_time_notation_in_Denmark
Year used in some calendars
analogous to the way time is shown on a 24-hour clock: during the first hour of a day, the time elapsed is 0 hours, n minutes. List of non-standard dates
Year_zero
Identifier for a time offset from UTC of +7
issuance of President Decree 41/1987 meant that the province's clocks sprang forward by one hour, thereby synchronising its mean time with other provinces
UTC+07:00
time zones. Western Indonesia Time (Waktu Indonesia Barat, WIB) is seven hours ahead (UTC+07:00) of the Coordinated Universal Time (UTC), used in the islands
Time_in_Indonesia
Daylight saving time (DST) was first introduced in 1919, advancing the clock twenty minutes to UTC+00:20 at 02:00 (local time) on the first day of September
Time_in_Ghana
Linguistic comparison
"perpuluhan". Indonesia uses 24-hour clock convention as standard, although 12-hour clock is common orally. In Malaysia, 12-hour clock is the standard. Brunei
Comparison of Indonesian and Standard Malay
Comparison_of_Indonesian_and_Standard_Malay
Identifier for a time offset from UTC of +8
(31 July 2019). "S'pore is in the wrong time zone because we set our clocks 1 hour ahead". Mothership. Retrieved 4 April 2026. "Idea of common Asean time
UTC+08:00
International standards for dates and times
Representation of time of the day, dated March 1975, standardized 24-hour wall clock times and their notation, but without handling time zones. ISO 4031:
ISO_8601
24-hour clock is used for official purposes, including transport schedules, however in everyday conversation Romanians commonly use the 12-hour clock
Time_in_Romania
Type of clock that displays the time with numbers
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
Digital_clock
Specially designed clock that keeps track of the Moon's apparent motion around the Earth
average) 24 hours and 50.5 minutes to rotate under the Moon, so the time between high lunar tides fluctuates between 12 and 13 hours. A tide clock is divided
Tide_clock
35mm film camera
date (using the ymd format) or the time (using the HH mm format, ie. 24-hour clock, no seconds). The back is separately powered by two LR44 or SR44 button
Pentax_PC35AF
Timepiece in which time is measured by the flow of liquid into or out of a vessel
A water clock, or clepsydra (from Ancient Greek κλεψύδρα (klepsúdra) 'pipette, water clock'; from κλέπτω (kléptō) 'to steal' and ὕδωρ (hydor) 'water';
Water_clock
Natural internal process that regulates the sleep-wake cycle
experiment designed to distinguish an endogenous clock from responses to daily stimuli. He noted that 24-hour patterns in the movement of the leaves of the
Circadian_rhythm
Electronic version of a calendar
Middle East. Selecting a clock format, such as the 24-hour clock (00:00–23:59, most common internationally) or the 12-hour clock (12:00 a.m.–11:59 p.m.
Digital_calendar
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