What is full AM used for?

AM or Ante Meridiem represents the first period. AM or it is full form Ante Meridiem describes the midnight to noontime. The full form of PM is Post Meridiem . PM denotes post-midday period.

1. How is AM and PM used?
2. Is AM used for night?

How is AM and PM used?

“AM” and “PM” are both abbreviations of Latin terms and refer to a specific time of day: AM (ante meridiem) means “before noon,” so it refers to the morning. PM (post meridiem) means “after noon,” so it refers to any time after midday.

Is AM used for night?

Yup, the abbreviation a.m. is short for the Latin ante meridiem, meaning “before noon,” which refers to the period from midnight until noon.