Kids Corner

Time Conversion from 24-hour clock to 12-hour clock

In 24-hour clock the time has two parts.

Hour	Minute
‘_ _’ ( 00 to 23)	‘_ _’ (00 to 59)

The hour part and minute part is separated by ‘:’.

Over View:

CASE	24-hour clock	12-hour clock
1	00: _ _	12:_ _ am
2	01 to 11: _ _	01 to 11: _ _ am
3	12: _ _	12:_ _ pm
4	13 to 23:_ _	13 to 23:_ _ - 12:00 =  _ _: _ _ pm

Explanation with rules and examples

CASE 1: If there is ‘00’ in the hour part:

Example:

Suppose the given time is, 

00:45               (This time is in 24-hour clock.)

Rule:   To convert the given time, just replace ‘00’ with ‘12’ and add ‘am’ to the right side

i.e. 12:45 am   (Now given time is in 12-hour clock)

Note:   Minute part will always remain same.

24-hour clock	12-hour clock
00:45	12:45 am

CASE 2: If there is any hour from 01 to 11 in the hour part:

Example 1:

Suppose the given time is, 

10:20               (This time is in 24-hour clock.)

Rule:   To convert the given time, just add ‘am’ to the right side.

i.e. 10:20 am   (Now given time is in 12-hour clock)

Note:   Minute part will always remain same.

            In this case the hour part will remain same.

24-hour clock	12-hour clock
10:20	10:20 am

Example 2:

Suppose the given time is, 

04:10               (This time is in 24-hour clock.)

Rule:   To convert the given time, just add ‘am’ to the right side.

i.e. 04:10 am   (Now given time is in 12-hour clock)

Note:   Minute part will always remain same.

            In this case the hour part will remain same.

24-hour clock	12-hour clock
04:10	04:10 am

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CASE 3: If there is ‘12’ in the hour part:

Example:

Suppose the given time is, 

12:30               (This time is in 24-hour clock.)

Rule:   To convert the given time, just add ‘pm’ to the right side.

i.e. 12:30 pm   ( Now given time is in 12-hour clock)

Note:   Minute part will always remain same.

            In this case the hour part will remain same.

24-hour clock	12-hour clock
12:30	12:30 pm

CASE 4: If there is any hour from 13 to 23 in the hour part:

Example 1:

Suppose the given time is, 

19:15                           (This time is in 24-hour clock.)

Rule:   To convert the given time, subtract 12:00 from the given time and add ‘pm’ to the right side.

i.e.       19:15               (Given time)

         -  12:00               (Subtraction)

            07:15 pm        (Now given time is in 12-hour clock)

Note:   Minute part will always remain same.

24-hour clock	12-hour clock
19:15	07:15 pm

Example 2:

Suppose the given time is, 

23:55               (This time is in 24-hour clock.)

Rule:   To convert the given time, subtract 12:00 from the given time and add ‘pm’ to the right side.

i.e.       23:55               (Given time)

         -  12:00               (Subtraction)

            11:55 pm                    (Now given time is in 12-hour clock)

Note:   Minute part will always remain same.

24-hour clock	12-hour clock
23:55	11:55 pm

“Please inform me if any mistake is found…”