Conversion is as follows:
00:00 = 12 am (12 midnight)
00:01 to 00:59 = 12:01 am to 12:59 am
01:00 to 11:59 = 01:00 am to 11:59 am
12:00 = 12 midday
12:01 to 12:59 = 12:01 pm to 12:59 pm
13:00 to 23:59 = 1:00 pm to 11:59 pm
Note, the usage of 12 am and 12 midday is what I was taught at school, Microsoft disagrees.
Now, why would anyone want to use such a complicated system as the 12-hour clock?
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The difference between 12 hour clock and a 24 hour clock is that when you say 1:00am for a 12 hour clock you would say 0100 hours
A twelve hour clock has 1,2,3,4,5,6,7,8,9,10,11,12 and is the standard form time clock. A 24 hour clock has times starting at 1-12, but after it will start with 13 as 1 p.m. all the way to 24 or 00 as 12 midnight.
that is 1250
On a normal, 12-hour clock, that takes 3 hours. On a military, 24-hour clock, it takes 6 hours.
24 Hour Clock: 4 numbers, the first 2 are the hours the second 2 the minutes. so 10 hours and 22 minutes. the minutes stay the same. If the hours are less than 12, keep it the same, but add an 'am'. If more than 12, deduct 12 and add 'pm' Since 10 is less than 12, it is 10:22am