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Propertytype:	game-info
Function:	Any copyright information (e.g. for the annotations) should
		be included here.
Related:	US, SO, AN

Property:	DT
Propvalue:	simpletext
Propertytype:	game-info
Function:	Provides the date when the game was played.
		It is MANDATORY to use the ISO-standard format for DT.
		Note: ISO format implies usage of the Gregorian calendar.
		Syntax:
		"YYYY-MM-DD" year (4 digits), month (2 digits), day (2 digits)
		Do not use other separators such as "/", " ", "," or ".".
		Partial dates are allowed:
		"YYYY" - game was played in YYYY
		"YYYY-MM" - game was played in YYYY, month MM
		For games that last more than one day: separate other dates
		by a comma (no spaces!); following shortcuts may be used:
		"MM-DD" - if preceded by YYYY-MM-DD, YYYY-MM, MM-DD, MM or DD
		"MM" - if preceded by YYYY-MM or MM