A.M. is an abbreviation for the Latin words "Ante meridian," which translates in English to "before the middle of the day." P.M. is an abbreviation for the Latin words "Post meridian," which translates in English to "after the middle of the day." That is why A.M. is 12:00 midnight to 11:59 in the morning and P.M. is 12:00 noon (i.e. the middle of the day) to 11:59 in the evening.
antemeridian is AM; postmeridian is PM.
AM: Ante Meridiem; PM: Post Meridiem
Ante Meridian Latin = "before midday" Post Meridian Latin = "after midday"
From 5 PM to 9:30 PM, there are 4 hours and 30 minutes. This includes the full 4 hours from 5 PM to 9 PM, plus an additional 30 minutes to reach 9:30 PM.
The time from 9 AM to 5 PM is a total of 8 hours. This duration includes the full hours from 9 AM to 4 PM, plus one additional hour from 4 PM to 5 PM.
antemeridian is AM; postmeridian is PM.
AM: Ante Meridiem; PM: Post Meridiem
post meridem
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Am = Ante meridian and Pm = post meridian
The acronym PM can mean post meridian, which is the time from noon until midnight, or it can mean prime minister.
AM is ante meridian - After 12Midnight and before 12 Noon. PM is post meridian - After 12 Noon and Before 12 Midnight.
Anti-Meridiem meaning before midday PM is Post-Meridiem meaning after midday
Ante Meridian Latin = "before midday" Post Meridian Latin = "after midday"
From 5 PM to 9:30 PM, there are 4 hours and 30 minutes. This includes the full 4 hours from 5 PM to 9 PM, plus an additional 30 minutes to reach 9:30 PM.
When saying AM or PM there are pauses between each letter. AM refers to morning and PM to the evening.
Midnight to Noon is AM. Noon to midnight is PM.