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The 24-hour clock is the convention of time keeping in which the day runs from midnight to midnight and is divided into 24 hours, indicated by the hours passed since midnight, from 0 to 23.

This system is the most commonly used time notation in the world today, and is used by international standard ISO 8601.

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.

It is popularly referred to as military time in the United States, and a handful of other countries where the 12-hour clock is still dominant.

Standard time is the synchronization of clocks within a geographical area or region to a single time standard, rather than using solar time or a locally chosen meridian (longitude) to establish a local mean time standard.

Historically, the concept was established during the 19th century to aid weather forecasting and train travel.

Applied globally in the 20th century, the geographical areas became extended around evenly spaced meridians into time zones which (usually) centered on them.

The standard time set in each time zone has come to be defined in terms of offsets from Universal Time.

In regions where daylight saving time is used, that time is defined by another offset, from the standard time in its applicable time zones.