The time can be able to tell from clocks.
The digital clock has a number display.
The analogue clock has hands. It shows 12- hour clock times.
am: ante meridian is to use am for times before noon.
pm: post meridian is to use pm for times after noon.
Times can be calculate and convert to minutes and seconds.
1 hour = 60 minutes
1 minutes = 60 seconds
24 hour = 1 day
Roman numerals are a numeral system originated in ancient Rome.