What’s the 24-hour clock

The 24-hour clock is commonly used in timetables and where space is restricted. It is used without ‘am’ or ‘pm’..

The 24-hour clock is a convention of time keeping in which the day runs from midnight to midnight and is divided into 24 hours. The 24-hour clock starts at midnight (00:00) and indicates the hours passed, from 0 to 23.

It is the most common system in use in the world, and is the international standard notation of time. (ISO 8601)

The 24-hour clock is used throughout transportnsw.info. Times are presented as HH:MM

12-hour clock 1:00am 2:00am 3:00am 4:00am 5:00am 6:00am
24-hour clock 01:00 02:00 03:00 04:00 05:00 06:00
12-hour clock 7:00am 8:00am 9:00am 10:00am 11:00am 12:00pm
24-hour clock 07:00 08:00 09:00 10:00 11:00 12:00
(midday)
12-hour clock 1:00pm 2:00pm 3:00pm 4:00pm 5:00pm 6:00pm
24-hour clock 13:00 14:00 15:00 16:00 17:00 18:00
12-hour clock 7:00pm 8:00pm 9:00pm 10:00pm 11:00pm 12:00am
24-hour clock 19:00 20:00 21:00 22:00 23:00 00:00
(midnight)