AM and PM are acronyms used to indicate the time of day. AM stands for “ante meridiem,” which is Latin for “before noon,” and PM stands for “post meridiem,” which is Latin for “after noon.”
The standard way of measuring time is based on a 24-hour clock, with one complete rotation of the clock representing one day. The 24-hour clock is divided into two 12-hour periods, with the first period being from midnight to noon and the second period being from noon to midnight.
AM is used to indicate the time of day between midnight and noon. For example, “8:00 AM” means 8 o’clock in the morning. The hours between midnight and noon are numbered from 1 to 12, with 12:00 AM being midnight.
PM is used to indicate the time of day between noon and midnight. For example, “8:00 PM” means 8 o’clock in the evening. The hours between noon and midnight are also numbered from 1 to 12, with 12:00 PM being noon.
It’s important to note that in some countries, the 12 hour clock notation is not used, instead they use the 24 hour clock notation where 00:00 hours is midnight and 23:59 hours is just before midnight.
In summary, AM and PM are acronyms used to indicate the time of day. AM stands for “ante meridiem” which means “before noon” and PM stands for “post meridiem” which means “after noon”. The standard way of measuring time is based on a 24-hour clock, with one complete rotation of the clock representing one day. The 24-hour clock is divided into two 12-hour periods, with the first period being from midnight to noon and the second period being from noon to midnight. AM is used to indicate the time of day between midnight and noon, PM is used to indicate the time of day between noon and midnight. In some countries, the 12 hour clock notation is not used, instead they use the 24 hour clock notation.