Google search results: 
 * "founded 1 June": about 105,000 results 
 Most of these results are not sentences with "founded 1 June YYYY", but many are, including some very British examples. 
 * Wikipedia's article on Neue Rheinische Zeitung: The Neue Rheinische Zeitung: Organ der Demokratie ("New Rhenish Newspaper: Organ of Democracy") was founded 1 June 1848 in Cologne (Köln), part of Rhineland. 
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 So I still don't think it's wrong to say "the Meimad movement was founded 1 June 1988 ..." in any variety of English. —