Appendix 1: Acceptable date formats

Type	Acceptable	Unacceptable
Single year	1970	'70
Month and year	April 1970	Apr 1970 04/1970 04/70
Day, month and year	01 April 1970	1 April 1970 01/04/1970
Year range	1970-1972	1970 - 1972 1970-72 1970 - 72
Month and year range	April-June 1970	April - June 1970 Apr-Jun 1970
	April 1970-August 1972	April 1970 - August 1972 Apr 1970 - Aug 1972
Century range	19th century-20th century	19th-20th centuries 19th - 20th century
Estimated date	1970s	1970's
	c.1970	c. 1970 c.1970s c 1970
	20th century	20th c. 20th cent.
	20th century
	20th century
	20th century
	19th century-early 20th century
	Early-mid 20th century	Early-Mid 20th century Early 20th century-mid 20th century
	Mid-late 20th century
Range with specific and estimated date	1953-1960s
	c.1970-2005
Range with estimated dates	c.1953-c.1968
	1930s-1960s