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The American Heritage Dictionary of the English Language states "By convention, 12 AM denotes midnight and 12 PM denotes noon. Because of the potential for confusion, it is advisable to use 12 noon and 12 midnight". [34] E. G. Richards in his book Mapping Time (1999) provided a diagram in which 12 a.m. means noon and 12 p.m. means midnight. [35]
In traditional American usage, dates are written in the month–day–year order (e.g. February 11, 2025) with a comma before and after the year if it is not at the end of a sentence [2] and time in 12-hour notation (4:34 am). International date and time formats typically follow the ISO 8601 format (2025-02-11) for all-numeric dates, [3] write ...
If you’re using military time, or the 24-hour system, you don’t need AM and PM because there are no duplicate numbers. Instead of going back to 1 after 12:59 (PM), you move on to 13:00.
The notation 24:00 mainly serves to refer to the exact end of a day in a time interval. A typical usage is giving opening hours ending at midnight (e.g. "00:00–24:00", "07:00–24:00"). Similarly, some bus and train timetables show 00:00 as departure time and 24:00 as arrival time.
Punctuation and spacing styles differ, even within English-speaking countries (6:30 p.m., 6:30 pm, 6:30 PM, 6.30pm, etc.). [ citation needed ] Most people who live in countries that use one of the clocks dominantly are still able to understand both systems without much confusion; the statements "three o'clock" and "15:00", for example, are ...
The time-of-day abbreviations (which are generally lowercase only) are handled in various conflicting styles, including "a.m." and "p.m." with a space between the time and the abbreviation ("1.45 p.m."); [8] "am" and "pm" with a space ("1.45 pm" – recognised as an alternative usage by Oxford); [8] and the same without a space ("1.45pm ...
When the time is expressed in the HH:MM:SS notation, the Roman ante/post-meridiem indicators (AM and PM) are also used frequently. In addition, they sometimes follow the convention of writing the Korean-style indicator before the time; it is not uncommon to encounter times expressed in such a way, e.g., “ AM 9:18 ” instead of “ 9:18 AM ”.
The date and time in Australia are most commonly recorded using the day–month–year format (8 February 2025) and the 12-hour clock (1:58 am), although 24-hour time is used in some cases. For example, some public transport operators such as V/Line [1] and Transport NSW [2] use 24-hour time, although others use 12-hour time instead.