'Noon' means 'midday' or 12 o'clock during the day. 'Midnight' refers to 12 o'clock (or 0:00) during the night. When using a 12-hour clock, 12 pm typically refers to noon and 12 am means midnight. ... Alternatively, you could use the 24-hour clock system, where 12:00 is noon and 00:00 (or 24:00) is midnight.

What do you mean by O clock?

o'clock. / (əˈklɒk) / adverb. used after a number from one to twelve to indicate the hour of the day or night. used after a number to indicate direction or position relative to the observer, twelve o'clock being directly ahead or overhead and other positions being obtained by comparisons with a clock face.

What does around one o'clock mean?

at one (o'clock): at 1am, at 1pm. idiom.