Simply use the words “noon” and “midnight” instead of a.m. and p.m. On the 24-hour clock, both 00:00 and 24:00 indicate midnight. In informal usage, “12 o’clock” can be either noon or midnight., To properly understand midnight’s designation, it’s essential to familiarize ourselves with the 12-hour clock system. In this system, each day is divided into two periods: AM (ante meridiem) which means ‘before midday,’ and PM (post meridiem) meaning ‘after midday.’, By convention, "12 a.m." denotes midnight and "12 p.m." denotes noon. [38] However, many style guides recommend against using either because of the potential for confusion., AM means before noon. This is the 12-hour period from midnight to noon. PM means after noon. It covers the 12 hours from noon to midnight. Using numbers from 1 to 12, followed by am or pm, the 12-hour clock system identifies all 24 hours of the day., One ‘day’ totals 24 hours, and most clocks divide a day into two 12-hour periods of AM and PM. AM stands for the Latin “ante meridiem”, which translates to before midday. This is the time before the sun has crossed the meridian. PM stands for “post meridiem” or after midday., .