Dates

Use upper case for months: January, February
do not use a comma between the month and year: 4 June 2017
when space is an issue - in tables or publication titles, for example - you can use truncated months: Jan, Feb
we use ‘to’ in date ranges - not hyphens, en rules or em dashes. For example:
tax year 2011 to 2012
Monday to Friday, 9am to 5pm (put different days on a new line, do not separate with a comma)
10 November to 21 December
do not use quarter for dates, use the months: ‘department expenses, Jan to Mar 2013’
when referring to today (as in a news article) include the date: ‘The minister announced today (14 June 2012) that…’

Use ‘to’ instead of a dash or slash in date ranges. ‘To’ is quicker to read than a dash, and it’s easier for screen readers.

Always explain what your date range represents, eg ‘tax year 2013 to 2014’ or ‘September 2013 to July 2014’. Date ranges can be the academic year, calendar year or tax year. This is why date ranges must be very, very clear.

If you’re comparing statistics from 2 different tax or financial years, use ‘Comparing the financial year ending 2011 with that ending 2012, there was a 9% decrease’.

Taken from:
https://www.gov.uk/guidance/content-design/writing-for-gov-uk#date-ranges

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