AM means before noon. This is the 12-hour period from midnight to noon. PM means after noon. It covers the 12 hours from noon to midnight. Using numbers from 1 to 12, followed by am or pm, the 12-hour clock system identifies all 24 hours of the day.

AM and PM are units that are used to represent time in a 12-hour clock. From midnight to 11:59 noon, the time is represented as AM, and from 12 noon to 11:59 midnight, it is represented as PM. AM means Ante Meridiem and PM means Post Meridiem.

12:00 can only be noon – midday. Midnight is called 24:00 and used to mean the end of the day. It is also used to mean the beginning of the day. For example, you would say "Tuesday at 24:00" and "Wednesday at 24:00" to mean exactly the same time. [source?] Advantages over the 12-hour clock system: [source?]

In particular, AM stands for ante meridiem, which translates into English as ‘before midday’. Meanwhile, PM is post meridiem and means in English ‘after midday’. These abbreviations are used to identify the time in the 12-hour clock format instead of using 24 hours.

The meaning of AM and PM is ‘Ante Meridiem’ and ‘Post Meridiem’, which means before noon or midday. We associate P.M. with the afternoon and evening. P.M. is an abbreviated term for ‘Post Meridiem,’ which implies afternoon or after midday. In a 12-hour clock, these are used as time indications centered around noon.

So 1 PM in 24-hour format is 13:00, 2 PM is 14:00, and so on. All you need to do is add 12 to any time in the PM to get 24-hour format time. Here are all the hourly times in AM/PM and 24-hour format: The 24 hour Time Format variation on the normal 24 hour time.

Normally time is shown as Hours:Minutes. There are 24 Hours in a Day and 60 Minutes in each Hour. Example: 10:25 means 10 Hours and 25 Minutes. There are two main ways to show the …

9:00 PM + 12 Hours = 21:00 or 2100 military time. If you were considering a conversion for 9:00 AM instead, the converted military time would be 09:00 or 0900. This is pronounced “Zero …

When someone says it's 9 AM, it means that the time is 9 O'Clock in the morning. So, from 12 at night to 12 in the noon (exactly at 11:59 AM), it represents the day clock. Similarly, when someone says it is 9 PM, it means that the time is 9 O'Clock in the evening.

9pm is 9 at night on a 12 hour clock, or 21:00 on a 24 hour clock. The US generally uses a 12 hour time format, so AM times are from midnight to noon (00:00 to 11:59 on a 24 hour clock) and PM times are 12pm to 11:59pm (12:00 to 23:59 on a 24 hour clock).