Core: GetWeek, GetWeekDate

git-svn-id: http://upp-mirror.googlecode.com/svn/trunk@7762 05275033-79c2-2956-22f4-0a99e774df92
DropChoice: RdOnlyDrop

git-svn-id: http://upp-mirror.googlecode.com/svn/trunk@7763 05275033-79c2-2956-22f4-0a99e774df92