Historical clue formulations

• Den ___, Nederland — 2018-06-21
• Den ___, Nederland — 2012-07-01
• Den ___, Nederland — 2011-06-05
• City name part that's Dutch for "hedge" — 2009-06-13
• Den ___, Nederland — 2008-09-26
• Den ___ (Dutch city, to the Dutch) — 2000-10-22