AM vs PM visualized
...
11:00
AM
...
11:30
AM
...
11:59
AM
12:00
PM
12:01
PM
...
12:30
PM
...
1:00
PM
...
...
11:00
PM
...
11:30
PM
...
11:59
PM
12:00
AM
12:01
AM
...
12:30
AM
...
1:00
AM
...
Noon
Day
Midnight