- AM is formally known as Ante-Meridiem. AM is a Latin phrase that refers to the 12 hours before Noon on a calendar. Anti Meridiem denotes before noon. It belongs to the 12-hour clock and is a unit of the time standard. The time cycle of a day is divided into two sections by the 12-hour schedule. The first phase is known as AM, or Ante Meridiem. AM, which stands for Ante Meridiem, refers to the hours between midnight and noon.
- PM is formally known as Post Meridiem. PM stands for post-midday. It is yet another conventional time unit connected to the 12-hour clock. The period is divided into two equal periods, the first and second, according to the 12-hour clock system. The second period is known as PM, or Post Meridiem. PM, which stands for Post Meridiem, refers to the period from Noon to Midnight.
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Example
If I say I’ll be there at 8, it’s unclear if I’m coming in the morning or the evening. The 12-hour clock uses the AM and PM systems to avoid this uncertainty. The morning and evening are, thus, 8 am and 8 pm, respectively.