![]() ![]() ![]() Legal contracts often run from the start date at 00:00 until the end date at 24:00. Similarly, some bus and train timetables show 00:00 as departure time and 24:00 as arrival time. A typical usage is giving opening hours ending at midnight (e.g. The notation 24:00 mainly serves to refer to the exact end of a day in a time interval. Where convenient, the notation 24:00 may also be used to refer to midnight at the end of a given date - that is, 24:00 of one day is the same time as 00:00 of the following day. In the 24-hour time notation, the day begins at midnight, 00:00 or 0:00, and the last minute of the day begins at 23:59. For the Christian metal album, see Veni Domine. In some contexts (including some computer protocols), no separator is used and times are written as, for example, "2359". In the past, some European countries used the dot on the line as a separator, but most national standards on time notation have since then been changed to the international standard colon. The most commonly used separator symbol between hours, minutes and seconds is the colon, which is also the symbol used in ISO 8601. Where subsecond resolution is required, the seconds can be a decimal fraction that is, the fractional part follows a decimal dot or comma, as in 01:23:45.678. The leading zero is very commonly used in computer applications, and always used when a specification requires it (for example, ISO 8601). A leading zero is added for numbers under 10, but it is optional for the hours. In the case of a leap second, the value of ss may extend to 60. Description 24-hour clockġ2-hour 24-hour digital clock in Miaoli HSR station.Ī time of day is written in the 24-hour notation in the form hh:mm (for example 01:23) or hh:mm:ss (for example, 01:23:45), where hh (00 to 23) is the number of full hours that have passed since midnight, mm (00 to 59) is the number of full minutes that have passed since the last full hour, and ss (00 to 59) is the number of seconds since the last full minute. For example, in the practice of medicine, the 24-hour clock is generally used in documentation of care as it prevents any ambiguity as to when events occurred in a patient's medical history. In countries where the 12-hour clock is dominant, some professions prefer to use the 24-hour clock. Ī number of countries, particularly English speaking, use the 12-hour clock, or a mixture of the 24- and 12-hour time systems. This system, as opposed to the 12-hour clock, is the most commonly used time notation in the world today, and is used by the international standard ISO 8601. This is indicated by the hours (and minutes) passed since midnight, from 0(:00) to 23(:59). 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. To get around this issue, if the person meant that Sunday were just beginning, they could say 00:01 AM or simply 00:01 on Sunday if Sunday were ending, they could say 11:59 PM or 23:59 Sunday.A public 24 hour clock in Curitiba, Brazil with the hour hand displayed on the outside and the minute hand shown on the inside. For example, if someone says "midnight on Sunday," regardless whether they use the 12-hour clock or 24-hour clock it is not possible to know with certainty whether midnight on Sunday refers to the time at which Sunday is ending or beginning without being told. Neither timekeeping method is perfect however, and one of the potential sources of confusion that both methods are susceptible to occurs at midnight (00:00 or 24:00 in the 24-hour click and 12:00 AM in the 12-hour clock). None of the hours in the 24-hour clock repeat, so there is no risk of confusion. The main benefit of using the 24-hour clock system is the lack of ambiguity, since the 12-hour clock requires the specification of AM and PM, and can sometimes lead to confusion if the speaker (or writer) does not specify whether a given time occurs before or after noon. Note that midnight in the 24-hour clock can also be written as 24:00. ![]()
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