This document provides instructions for converting between 12-hour and 24-hour time formats. It explains that to convert a 24-hour time to 12-hour, one subtracts 12 if the hour is greater than 12 or changes 00 to 12am. When converting 12-hour to 24-hour, 12pm becomes the hour and 12am becomes 00, while other pm times have 12 added to the hour. The minutes and seconds never change between the two formats.

3. Converting from 24-hour times to 12-hour times
The following simple steps will help you change a 24-hour time
to a 12-hour time with 'am' and 'pm'.
. If the hour is exactly 12, then simply label it as a pm time.
. If the hour is 00, then change it to 12 and label it as an am
time.
. If the hour is greater than 12, then simply subtract 12 from the
hour and label it as a pm time.
. Otherwise, simply label it as an am time and take away any
leading zeros.
The minutes and seconds never change when changing
between 24 hour and 12-hour times.
Examples
14:36 = 2:36pm 02:12 = 2:12am
09:24 = 9:24am 17:48 = 5:48pm
00:45 = 12:45am 12:15 = 12:15pm

4. 20:36 = 8:36pm 23:56 = 11:56pm
Converting from 12-hour times to 24-hour clock
The following simple steps will help you change a 12-hour time
to a 24-hour time.
If the hour is exactly 12pm, then simply remove the 'pm' label.
If the hour is 12am, then change it to 00.
If the hour is a pm time, then simply add 12 to the hour.
Otherwise, the hour does not change. If it is less than 10, then
add a zero before the digit.
The minutes and seconds never change when changing
between 24 hour and 12-hour times.
Examples

5. 1:45am = 01:45 1:45pm = 13:45
4:20am = 04:20 4:20pm = 16:20
11:32am = 11:32 11:32pm = 23:32
12:07am = 00:07 12:07pm = 12:07