The Latin phrase Ante Meridiem (AM) means “before midday.” In common usage, the term is abbreviated as a.m. or AM. When written in full, the phrase is typically followed by a period (full stop).
The 24-hour clock is the most commonly used timekeeping system in the world today. As such, it is often used to indicate when an event will occur “ante meridiem” or “post meridiem”. For example, if an event is scheduled to occur at 10:00 p.m., it would be written as 22:00 (military time) or 10:00 p.m. However, if that same event were scheduled to occur at 2:00 a.m., it would be written as 02:00 (military time) or 0200.
In North America and Europe, ante meridiem hours are typically denoted by am while postmeridian hours are denoted by pm—though variations of these conventions exist around the world (e.g., in New Zealand and Australia). During daylight saving time in North America and Europe, clocks are moved one hour forward during spring months so that evenings may have more daylight and mornings have less; thus there can be confusion over whether 12 midnight refers to 0h before or after this shift occurs.
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