no punctuation between the day, date, month and year and do not use '1st', '2nd', '3rd', etc.
1 January 2000
Assignments must be completed by Monday 25 December 2015.
use an en dash in a range of dates
The centre is open from 1–15 October.
use the following in forms, tables and where space is limited
spell out the first to the ninth and use numerals from 10 onwards
include a space between the year and 'AD' and 'BC'
the second century AD
the 12th century BC
use figures and no apostrophe
in the 90s
periods of time
it is not necessary to include an apostrophe in periods of time (see also apostrophes)
five years work experience
10 months study
range of years
use an en dash with no space on either side and use the following conventions
use a full stop between the hours and minutes
no space between the time and am/pm (and no full stops in 'am' and 'pm')
use an en dash between time spans, with no spaces on either side
do not put '00' if the time is on the hour
use the following to avoid confusion
noon (or midday) for 12pm
midnight for 12am
time and date
no punctuation required between the time and date/day
9.30am–5.30pm Monday to Friday
10.30am Thursday 31 October 2015