noon
1200 American Eastern Standard Time = 1700 UTC 1200 Eastern Daylight Saving Time = 1600 UTC 1200 Eastern Greenland Time = 1300 UTC 1200 Eastern Greenland Summer Time = 1200 UTC 1200 Eastern European Time = 1000 UTC 1200 East Africa Time = 0900 UTC 1200 Eastern European Summer Time = 0900 UTC 1200 Further-Eastern European Time = 0900 UTC 1200 East Timor Time = 0300 UTC 1200 Eastern Indonesian Time = 0300 UTC 1200 Australian Eastern Standard Time = 0200 UTC 1200 Eastern Summer Time = 0100 UTC
It's a 24 hour clock, so no AM or PM. The first two digits are hours, second two are minutes. The day starts at midnight, which is 2400 of yesterday and 0000 of today. Everything after noon (or 12:59 PM to be precise), you just add 1200 to the time. From midnight to 1 AM the hour is 00 (i.e. you subtract 1200 from civilian time.)
The officer dressed in civilian clothing. Civilian life was difficult for a retired Army officer to adjust to. The Marine was dating a civilian. The civilian did not understand military time.
Civilian Time
19:50 or 7:50 p.m. There is no "civilian time" - it's perfectly normal in many countries for the 24 hour clock to be used by the general public.
1200
One minute to midnight
1200
In military time, 1200 hours is equivalent to 12:00 PM in standard time. Military time uses a 24-hour format, so 1200 represents noon, marking the transition from the morning hours to the afternoon.
When it's 1200 KST in South Korea, the time in England is either 0300 GMT or 0400 BST.
military time is in 24 hour increments, civilian time is in 12 hour increments labeled am/pm.
2100 hours in military time is 9:00 PM in standard time. To convert military time to regular time, you subtract 1200 from any hour above 1200. Since 2100 is greater than 1200, it translates to 9 PM.