The 24-hour clock is a convention of time keeping in which the day A day is a unit of time equivalent to approximately 24 hours. It is not an SI unit but it is accepted for use with SI. The SI unit of time is the second runs from midnight to midnight and is divided into 24 hours The hour is a unit of time. It is not an SI unit but is accepted for use with the SI, numbered from 0 to 23. This system is the most commonly used time notation in the world today.[1] The 12-hour clock The 12-hour clock is a time conversion convention in which the 24 hours of the day are divided into two periods called ante meridiem (a.m., Latin: "before mid day" [English]: "before noon"] and post meridiem . The capitalization and punctuation of a.m. and p.m. may vary (consistently) in different texts. Each period consists of is, however, still dominant in a handful of countries,[1] particularly the United States The United States of America is a federal constitutional republic comprising fifty states and a federal district. The country is situated mostly in central North America, where its 48 contiguous states and Washington, D.C., the capital district, lie between the Pacific and Atlantic Oceans, bordered by Canada to the north and Mexico to the south, Canada Canada is a country occupying most of northern North America, extending from the Atlantic Ocean in the east to the Pacific Ocean in the west and northward into the Arctic Ocean. It is the world's second largest country by total area and shares the world's longest common border with the United States to the south and northwest (except Quebec Quebec is Canada's largest province by area and its second-largest administrative division; only the territory of Nunavut is larger. It is bordered to the west by the province of Ontario, James Bay and Hudson Bay, to the north by Hudson Strait and Ungava Bay, to the east by the Gulf of Saint Lawrence and the provinces of Newfoundland and Labrador) and Australia Australia , officially the Commonwealth of Australia, is a country in the southern hemisphere comprising the mainland, which is both the world's smallest continent and the world's largest island, the island of Tasmania, and numerous other islands in the Indian and Pacific Oceans.N4 Australia is the only place that is simultaneously considered a. 24-hour notation is also popularly referred to as military time or astronomical time in the US The United States of America is a federal constitutional republic comprising fifty states and a federal district. The country is situated mostly in central North America, where its 48 contiguous states and Washington, D.C., the capital district, lie between the Pacific and Atlantic Oceans, bordered by Canada to the north and Mexico to the south and Canada Canada is a country occupying most of northern North America, extending from the Atlantic Ocean in the east to the Pacific Ocean in the west and northward into the Arctic Ocean. It is the world's second largest country by total area and shares the world's longest common border with the United States to the south and northwest,[2] and in Australia Australia , officially the Commonwealth of Australia, is a country in the southern hemisphere comprising the mainland, which is both the world's smallest continent and the world's largest island, the island of Tasmania, and numerous other islands in the Indian and Pacific Oceans.N4 Australia is the only place that is simultaneously considered a (though rarely).[citation needed] In some parts of the world, it is called railway time or continental time. It is also the international standard notation of time (ISO The International Organization for Standardization , widely known as ISO (pronounced /ˈaɪsoʊ/), is an international-standard-setting body composed of representatives from various national standards organizations. Founded on 23 February 1947, the organization promulgates worldwide proprietary industrial and commercial standards. It has its 8601 ISO 8601 is an international standard for date and time representations issued by the International Organization for Standardization . Specifically, the standard is titled "Data elements and interchange formats — Information interchange — Representation of dates and times". The signature feature of ISO 8601 date and time).[3] In the practice of medicine Medicine is the art and science of healing. It encompasses a range of health care practices evolved to maintain and restore health by the prevention and treatment of illness, the 24-hour clock is generally used in documentation of care as it precludes any ambiguity as to what time events occurred in the patient's medical history The medical history or anamnesis of a patient is information gained by a physician or other healthcare professional by asking specific questions, either of the patient or of other people who know the person and can give suitable information (in this case, it is sometimes called heteroanamnesis), with the aim of obtaining information useful in.
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