Time separators

I use colons, as opposed to periods, to separate time units. Periods are the same as decimal points, which can cause confusion. Periods should be used after the number of seconds to indicate the decimals thereafter.

The couple met at 9:30am.
He went to bed at 11:45pm.
Schumacher’s 1:34.236 was the best lap time of the practice session.
He ran the marathon in 3:25:23.

As well as avoiding confusion, the above style is somewhat quaint.
Update: when working in business, the 24-hour clock should be used exclusively, with no separator between the hours and the minutes. (Thanks to Paul Clarke for highlighting this clarification.)

The meeting will take place at 1330 GMT (0830 EST).

Posted by Dan, 1 March, 2010 under Rules

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