The 24 – Hour Clock

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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
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