Time Standards

Naturally, the first question that needs to be answered is whether to use the 12- or 24-hour clock to represent time information. In the case of the 12-hour clock, a time in either the morning or afternoon is indicated hy the use of the common abbreviations AM or PM, usually following the time. Standards usually dictate that the granularity of time information should not exceed hours and minutes, except in technical documentation where more accuracy is required.

A discrete piece of time information, such as the start of a meeting, is usually written as 1:30 PM (12-hour clock) or 13:30 (24-hour clock). Quantities of time may be represented by 2h45m (2 hours and 45 minutes), and ranges as 13-13:30 (for a meeting lasting 30 minutes). Where an increased level of detail (or granularity) is required, SI conventions should be followed.

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