What time of day is 12am?

Another convention sometimes used is that, since 12 noon is by definition neither ante meridiem (before noon) nor post meridiem (after noon), then 12am refers to midnight at the start of the specified day (00:00) and 12pm to midnight at the end of that day (24:00).

Is 12am the start of a new day?

Midnight is usually defined as a.m., even though logically it’s neither “ante-meridiem” nor “post-meridiem”. In fact a new day is usually defined as beginning at 12 a.m. exactly, even though no time has elapsed in the new day at that time.

Why does 12pm come after 11am?

As standard 12:00 AM is taken as the start of the day. Time of the day is divided in two halves (24hour= 12 hours before midday + 12 hours after midday) so the 11 AM is 11th hour before midday as clock strikes 12 again it changes to PM (after midday) so it’s 12 PM after 11 AM and 12 AM after 11 PM.

Why do we call 12pm noon?

The word noon is derived from Latin nona hora, the ninth hour of the day, and is related to the liturgical term none. In English, the meaning of the word shifted to midday and the time gradually moved back to 12:00 local time (that is, not taking into account the modern invention of time zones).

Is 12pm correct?

To avoid confusion, the correct way to express 12 o’clock is 12 noon or 12 midnight. Alternatively, the 24-hour clock system may be used – 12:00 and 24:00 (or 00:00) respectively.