What does it mean that AM appears on the mobile phone?

A.m. is the abbreviation of ante meridiem, which usually appears at standard time 12h, which refers to the morning of a day (before 12 o'clock). 0 ~ 12 hour in the morning and 12 hour ~ 0 hour (including 12 hour) in the afternoon.

His working day starts at 3: 30am and lasts 12 hours. He started work at 3: 30 in the morning and lasted 12 hours.

Extended data:

Corresponding to AM is PM, which is the abbreviation of post meridiem, and refers to the afternoon of a day (after 12, that is, 12: 00: 00 ~ 23: 59: 59).

For example: 4: 50? Afternoon means 4: 50 pm; 1 1:00 ? P.m. stands for 165438+ 0 o'clock in the middle of the night; 12: 00 in the afternoon means noon 12.

In 24 hours, a day starts at midnight, 24:00- 1: 00, and the last minute of every day starts at 23:59 (midnight) and ends at 24:00 (midnight).