Kids Corner
Time Conversion from 12-hour clock to 24-hour clock
In 12-hour clock the
time has three parts.
Hour
Minute
Period
‘_ _’ ( 01 to 12)
‘_ _’ (00 to 59)
am or pm
The hour part and
minute part is separated by ‘ : ’. am
= ante meridian
pm
= post meridian
Over View:
CASE
12-hour
clock
24-hour
clock
1
12 : _ _ am
00:_ _
2
_
_ : _ _ am
_ _ : _ _
3
12 : _ _ pm
12 : _ _
4
_
_ : _ _ pm
12:00 + _ _ : _ _
Explanation with rules
and examples
CASE 1: If there is ‘12’ in the hour part and
period is ‘am’.
Example:
Suppose the given time
is,
12:45 am (This time is in 12-hour clock.)
Rule: To convert the given time, just replace ‘12’
with ‘00’ and remove ‘am’.
i.e. 00:45 (Now given time is in 24-hour clock)
Note: Minute part will always remain same.
12-hour
clock
24-hour
clock
12:45 am
00:45
CASE 2: If there is any hour other than 12 in
the hour part and period is ‘am’.
Example 1:
Suppose the given time
is,
10:20 am (This time is in 12-hour clock.)
Rule: To convert the given time,
just remove ‘am’.
i.e. 10:20 ( Now given time is in 24-hour clock)
Note: Minute part will always remain the same.
In this case the hour part will
remain same.
12-hour
clock
24-hour
clock
10:20 am
10:20
Example 2:
Suppose the given time
is,
04:10 am (This time is in 12-hour clock.)
Rule: To convert the given time,
just remove ‘am’.
i.e. 04:10 ( Now given time is in 24-hour clock)
Note: Minute part will
always remain same.
In this case the hour part will
remain same.
12-hour
clock
24-hour
clock
04:10 am
04:10
CASE 3: If there is ‘12’ in the hour part and
period is ‘pm’.
Example:
Suppose the given time
is,
12:30 pm (This time is in 12-hour clock.)
Rule: To convert the given time,
just remove ‘pm’.
i.e. 12:30 ( Now given time is in 24-hour clock)
Note: Minute part will always remain same.
In this case the hour part will
remain same.
12-hour
clock
24-hour
clock
12:30 pm
12:30
CASE 4: If there is any hour other than 12 in
the hour part and period is ‘pm’.
Example 1:
Suppose the given time
is,
07:15 pm (This time is in
12-hour clock.)
Rule: To convert the given time,
add 12:00 in the given time and remove ‘pm’.
i.e. 07:15 (Given
time)
+ 12:00 (Addition)
19:15 (Now
given time is in 24-hour clock)
Note: Minute part will always remain
same.
12-hour
clock
24-hour
clock
07:15 pm
19:15
Example 2:
Suppose the given time
is,
11:55 pm (This time is in 12-hour clock.)
Rule: To convert the given time,
add 12:00 in the given time and remove ‘pm’.
i.e. 11:55 (Given
time)
+ 12:00 (Addition)
23:55 (Now given time is in 24-hour
clock)
Note: Minute part will always
remain same.
12-hour
clock
24-hour
clock
11:55 pm
23:55
“Please
inform me if any mistake is found…”
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