Procedure to convert 12-hour format to 24-hour format — lesson. Mathematics State Board, Class 6.

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Step 1: If the given time is

$12\!:\!00$ a.m. (midnight), change

$12\!:\!00$ a.m. as

$00\!:\!00$ hours and proceed further. There is no change up to

$12\!:\!59$ p.m.

Step 2: If the given time is

$1\!:\!00$ a. m. to

$12\!:\!59$ p.m., then no time change in

$24$ -hour format. Just write the time as it is in

$4$ digits.

Step 3: If the given time is

$1\!:\!00$ p.m. to

$11\!:\!59$ p.m., add

$12\!:\!00$ hours to the given time and write it in

$4$ digits.

Example:

1. Convert

$12\!:\!15$ a.m. to

$24$ -hour format.

Solution:

By using the above procedure, change

$12\!:\!00$ a.m. as

$00\!:\!00$ hours.

Therefore,

$12\!:\!15$ a.m.

$=$

$00\!:\!15$ hours

2. Write

$8\!:\!45$ a.m. in

$24$ -hour format.

Solution:

$8\!:\!45$ a.m. lies between

$1\!:\!00$ a.m. to

$12\!:\!59$ p.m.

By the above procedure, no time change between

$1\!:\!00$ a.m. to

$12\!:\!59$ p.m.

Write the time as it is in

$4$ digits.

Therefore,

$8\!:\!45$ a.m.

$=$

$08\!:\!45$ hours.

3. Convert

$8:45$ p.m. in railway format.

Solution:

$8:45$ p.m. lies between

$1:00$ p.m. to

$11:59$ p.m.

Add

$12:00$ hours to the given time by the above procedure.

$\begin{array}{l} 8 : 45 \\ \underline{+ 12 : 00} \\ \underline{20 : 45} \end{array}$

Therefore,

$8:45$ p.m.

$=$

$20:45$ hours.

Important!

1. Write hours at the end of the

$24$ -hour time format. Don't write a.m. or p.m. at the end of

$24$ -hour format.

2. Minutes will not change in both

$12$ -hour and

$24$ -hour formats.

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5. Procedure to convert 12-hour format to 24-hour format

Theory: