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In 10.8.11 op:subtract-dayTimeDuration-from-date we read: If $arg2 is negative, then the xs:date returned precedes $arg1. This should say If $arg2 is positive, then the xs:date returned precedes $arg1. The same error occurs for other permutations of subtract-XX-duration-from-date|time
Thank you for catching that! Fixed!
Closing bug because commenter has not objected to the resolution posted and more than two weeks have passed.