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  2. What Do AM and PM Stand For? - AOL

    www.aol.com/am-pm-stand-153002424.html

    PM stands for “post meridiem,” meaning “after noon” or “after midday,” and as such applies to the times from noon onward. English-speaking countries have been using the “AM” and ...

  3. List of time zone abbreviations - Wikipedia

    en.wikipedia.org/.../List_of_time_zone_abbreviations

    Such designations can be ambiguous; for example, "CST" can mean China Standard Time (UTC+08:00), Cuba Standard Time (UTC−05:00), and (North American) Central Standard Time (UTC−06:00), and it is also a widely used variant of ACST (Australian Central Standard Time, UTC+9:30). Such designations predate both ISO 8601 and the internet era; in ...

  4. Eastern Time Zone - Wikipedia

    en.wikipedia.org/wiki/Eastern_Time_Zone

    The Eastern Time Zone (ET) is a time zone encompassing part or all of 23 states in the eastern part of the United States, parts of eastern Canada, and the state of Quintana Roo in Mexico. Eastern Standard Time ( EST ) is five hours behind Coordinated Universal Time ( UTC−05:00 ).

  5. 12-hour clock - Wikipedia

    en.wikipedia.org/wiki/12-hour_clock

    In several countries the 12-hour clock is the dominant written and spoken system of time, predominantly in nations that were part of the former British Empire, for example, the United Kingdom, Republic of Ireland, the United States, Canada (excluding Quebec), Australia, New Zealand, South Africa, India, Pakistan, and Bangladesh, and others ...

  6. Date and time notation in the United States - Wikipedia

    en.wikipedia.org/wiki/Date_and_time_notation_in...

    In these cases, exact and unambiguous communication of time is critical. If someone mistakes 5:00 AM for 5:00 PM in a hospital for example, when medication or other medical treatment is needed at a certain time, the outcome could be dire. Thus 24-hour time (5:00 PM written as 17:00) is used.

  7. List of postal codes - Wikipedia

    en.wikipedia.org/wiki/List_of_postal_codes

    The last four digits identify an area within the post office. For example, 00716-2604: 00716-for the east section of the city of Ponce and 2604 for Aceitillo St. in the neighborhood of Los Caobos. US Post office is changing the PR address format to the American one: 1234 No Name Avenue, San Juan, PR 00901. Qatar: QA: no codes Réunion: RE: 974NN

  8. Noon - Wikipedia

    en.wikipedia.org/wiki/Noon

    (for meridiem, literally 12:00 midday), 12 p.m. (for post meridiem, literally "after midday"), 12 pm, or 12:00 (using a 24-hour clock) or 1200 (military time). Solar noon is the time when the Sun appears to contact the local celestial meridian .

  9. Midnight - Wikipedia

    en.wikipedia.org/wiki/Midnight

    A clear convention may be legally defined or culturally promulgated. For example, the Hebrew calendar associates the start of a new day with sundown and midnight being a relative hour falling six hours after sundown. [6]: 25 Similarly, in traditional Arabic time at sunset, which marked the start of each new day, clocks were reset to 12:00.