The 24 – Hour Clock

Mathematics Class IV Time The 24 – Hour Clock

Some departments like the railways and the airlines use $24$ hour clock time.

In the place of the digits $1,\ 2,\ 3,\cdots ,9$ in the $12$ hour clock we use $01,\ 02,\ 03,\cdots ,\ 09$ in a $24$ hoyr clock time.

12 hour clock time	24 hour clock time
$12:00$ midnight	$0000$ hours
$12:05$ am	$0005$ hours
$12:59$ am	$0059$ hours
$1:00$ am	$0100$ hours
$2:30$ am	$0230$ hours
$9:10$ am	$0910$ hours
$12:00$ noon	$1200$ hours
$12:59$ pm	$1259$ hours

Time from 1 pm up to 12:00 midnight

12 hour clock time	24 hour clock time
$1:00$ pm	$1300$ hours
$1:55$ pm	$1355$ hours
$4:15$ pm	$1615$ hours
$9:30$ pm	$2130$ hours
$11:59$ pm	$1359$ hours
$12:00$ midnight	$2400$ hours