24 hour time convert 12hour time:
1-17hours37minute
Answers
Answer:
60 seconds = 1 minute
60 minutes = 1 hour
24 hours = 1 day
7 days = 1 week
52 weeks = 1 year
365 days = normal year
366 days = leap year
Leap years are divisible by 4
Centuries are not leap years unless divisible by 400
Calendar
January 31 days
February 28 days (29 in leap year)
March 31 days
April 30 days
May 31 days
June 30 days
July 31 days
August 31 days
September 30 days
October 31 days
November 30 days
December 31 days
12 hour and 24 hour clock
12 hour clock times are written with
am to represent morning
and pm to represent afternoon.
A colon is used to separate minutes.
Examples
9 :30 am is half past nine in the morning.
9: 37 pm is 23 minutes to ten in the evening.
24 hour clock times are written with 2 digits to show hours
and a colon to separate minutes.
Examples
09 :30 is half past nine in the morning.
21: 37 is 23 minutes to ten in the evening.
Military usage of 24 hour clock times
drops the colon
and adds the word hrs.
Examples
09 30 hrs is half past nine in the morning.
21 37 hrs is 23 minutes to ten in the evening.
Converting between 12 hour and 24 hour clock times
To convert from 12 hour clock times to 24 hour clock times,
drop the am or pm
add 12 to the hours if the time is in the afternoon ( pm)
Examples
9:30 am = 09:30 or 09 30 hrs
3.15 pm = 15:15 or 15 15 hrs
To convert from 24 hour clock times to 12 hour clock times,
subtract 12 from the hours if the 24 hour time is between 13:00 and 24:00 or 13 00 hrs and 24 00 hrs
drop the hrs if it was there
add am if the 24 hour time is is between 00:00 and 11:59
add pm if the 24 hour time is is between 12:01 and 24:00
Examples
03:15 = 3:15 am
23:23 = 11:23 pm
11 27 hrs = 11:27 am
21 00 hrs = 9 pm
Conversion table
Time
12 hour
24 hour
Military
Midnight
=
00:00
00 00 hrs
1 am
2 am
3 am
4 am
5 am
6 am
7 am
8 am
9 am
10 am
11 am
Midday
1 pm
2 pm
3 pm
4 pm
5 pm
6 pm
7 pm
8 pm
9 pm
10 pm
11 pm
01:00
02:00
03:00
04:00
05:00
06:00
07:00
08:00
09:00
10:00
11:00
12:00
13:00
14:00
15:00
16:00
17:00
18:00
19:00
20:00
21:00
22:00
23:00
01 00 hrs
02 00hrs
03 00 hrs
04 00 hrs
05 00 hrs
06 00 hrs
07 00 hrs
08 00 hrs
09 00 hrs
10 00 hrs
11 00 hrs
12 00 hrs
13 00 hrs
14 00 hrs
15 00 hrs
16 00 hrs
17 00 hrs
18 00 hrs
19 00 hrs
20 00 hrs
21 00 hrs
22 00 hrs
23 00 hrs
Midnight
00:00
00 00 hrs
Calculations with time
Do not use your calculator – unless you are using the Deg,Hour,Min function.
Otherwise, your answer will not be converted properly.
Examples
calculate the time difference between
a) 11:07 and 11:30 b) 11:07 and 12:00
3
examples
calculate the time difference between :-
a) 11:07 and 11:30
2
b) 11:07 and 12:00
3
C) 09:45 and 17:38
4
Remember
4.1 hrs = 4 hours 6 minutes , not 4 hours 10 minutes.
Hours
Minutes
1
60
0.05
3
0.1
6
0.15
9
0.2
12
0.25
15
0.3
18
0.35
21
0.4
24
0.45
27
0.5
30
0.55
33
0.6
36
0.65
39
0.7
42
0.75
45
0.8
48
0.85
51
0.9
54
0.95
57
World Time
World Time calculator
Time zone codes
Why change Time ?
© Alexander Forrest