| M|Y |
X |
W |
V |
U |
T |
S |
R |
Q |
P |
O |
N |
Z |
A |
B |
C |
D |
E |
F |
G |
H |
I |
K |
L |
M|Y |
AM* and PM* Abbreviation(s), Latin phrase, Meaning
|
Abbreviation(s) |
Latin phrase |
Meaning |
AM
A.M.
am
a.m. |
Ante Meridiem
Ante Meridian
Latin = "before midday"
|
before noon |
PM
P.M.
pm
p.m. |
Post Meridiem
Post Meridian
Latin = "after midday"
|
after noon
Afternoon |
| * |
- Terms 12 a.m. and 12 p.m. cause confusion and should not be used
as neither the "12 am" nor the "12 pm" designation is technically correct.
- It advisable to use 12 noon and 12 midnight where clarity is required.
- To avoid ambiguity, airlines, railroads, and insurance companies use 12:01am for an event beginning the day, 11:59pm for ending it.
|
|
Converting from AM / PM to 24 hour clock
|
| 12 midnight to 12:59 AM |
1:00 AM to 12:59 PM
|
1:00 PM to 11:59 PM |
| subtract 12 hours |
straight conversion
|
add 12 hours: |
EXAMPLES:
12 midnight --> 0000
12:13 AM --> 0013
12:59 AM --> 0059
|
EXAMPLES:
01:00 AM --> 0100
08:00 AM --> 0800
11:59 AM --> 1159
12 noon --> 1200
12:01 PM --> 1201
12:45 PM --> 1245
12:59 PM --> 1259
|
EXAMPLES:
01:00 PM --> 1300
03:30 PM --> 1530
06:00 PM --> 1800
09:00 PM --> 2100
10:30 PM --> 2230
11:05 PM --> 2305
11:59 PM --> 2359
|
| Converting from 24 hour clock to AM / PM
|
|
0000 to 0059 |
0100 to 1159
|
1200 to 1259 |
1300 to 2359 |
| add 12 hours |
straight conversion to AM
|
straight conversion to PM |
subtract 12 hours |
EXAMPLES:
0000 --> 12 midnight
0015 --> 12:15 AM
0030 --> 12:30 AM
0059 --> 12:59 AM
|
EXAMPLES:
0100 --> 01:00 AM
0300 --> 03:00 AM
0700 --> 07:00 AM
0830 --> 08:30 AM
1000 --> 10:00 AM
1159 --> 11:59 AM
|
EXAMPLES:
1200 --> 12 noon
1215 --> 12:15 PM
1230 --> 12:30 PM
1259 --> 12:59 PM
|
EXAMPLES:
1300 --> 01:00 PM
1500 --> 03:00 PM
1800 --> 06:00 PM
2030 --> 08:30 PM
2215 --> 10:15 PM
2359 --> 11:59 PM
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Regional Time Maps
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