Times and dates

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Dates should be given as day as a number, then month (avoid abbreviating), then the year in full. State dates, and in particular deadlines, clearly. Avoid statements like ‘in two weeks time’. Never add ‘st’, ‘nd’ or ‘th’ after the day.

Examples of the general rules:

• on 1 August

• Friday 1 August 2003

• 1990s, the 90s

• 1989 –1993 (note no space between the number and the en dash)

• 2004/2005 to show a financial year

• twentieth century

• nineteenth-century building stone (hyphenated when an adjective)

• use BC, AD, BP: note that it is 55 BC, and 10 000 years BP, but AD 1978.

• 2nd century BC

• Ma for millions of years, not My

Times should be given using the 24 hour clock: 00:00–23:59 not followed by ‘hours’. An international context may require a time zone too, such as GMT.