Midnight to Noon is AM.
Noon to midnight is PM.
No, full stops are not used in "am" and "pm". They are written as lowercase without periods: am, pm.
antemeridian is AM; postmeridian is PM.
AM: Ante Meridiem; PM: Post Meridiem
post meridem
Yes, if it's just to the next day
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The acronym PM can mean post meridian, which is the time from noon until midnight, or it can mean prime minister.
Am = Ante meridian and Pm = post meridian
AM is ante meridian - After 12Midnight and before 12 Noon. PM is post meridian - After 12 Noon and Before 12 Midnight.
1:00p.m.
The basket was half full at 12:59 pm because the number of grapes doubled every minute, leading to it being filled at 1:00 pm. Therefore, the basket was halfway filled the minute before it became full.