European units of measurement directives

Directive 80/181/EEC
European Union directive
Title	Units of Measure Directive
Made by	European Council
Made under	Art. 100
Journal reference	L39, 15 February 1980, p. 40–50
History
Date made	20 December 1979
Entry into force	21 December 1979
Other legislation
Amended by	see text
	Current legislation

Directive 71/354/EEC
European Union directive
Title	Units of Measure Directive
Made by	European Council
Made under	Art. 100
Journal reference	N C 78, 2 February 1971, P 53
History
Date made	18 October 1971
Entry into force	18 April 1973
Other legislation
Replaced by	80/181/EEC
	Repealed

As of 2009, the European Union had issued two units of measurement directives. In 1971, it issued Directive 71/354/EEC, which required EU member states to standardise on the International System of Units (SI) rather than use a variety of CGS and MKS units then in use. The second, which replaced the first, was Directive 80/181/EEC, enacted in 1979 and later amended several times (in 1984, 1989, 2000 and 2009), which issued a number of derogations to the United Kingdom and Ireland based on the former directive.