Is 4am a midnight?


Definitions of Time Periods

  • Midnight is the transition time period from one day to the next: the moment when the date changes.
  • Morning can be defined as starting from midnight to noon. Morning precedes afternoon, evening, and night in the sequence of a day.

Time Format Explanation

  • Showing the Time:
    • AM PM: Ante Meridiem Latin for "before midday" / Post Meridiem Latin for "after midday"
    • Midnight to Noon: 00:00 to 11:59
    • Noon to Midnight: 12:00 to 23:59

24-Hour Clock Representation

  • 12:30 AM on a 24-hour clock is represented as 0030, pronounced as “zero zero thirty hours”.

Historical Background of 12-Hour Clock

  • The 12-hour clock system dates back to ancient Mesopotamia and Egypt. Egyptians used a 12-hour sundial during the daytime and a 12-hour water clock at night. Early mechanical clocks displayed all 24 hours, but the 12-hour system was eventually adopted for simplicity and cost-effectiveness.

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