Rachel McAlpine discusses problems of time and place in her article Say when and where in web content.
Certain expressions in web content get users all discombobulated. Relative expressions of time and place need an anchor, a key, right there in the text.
“Special offer, this month only!” Which month? … Absolute location can also be a mystery on the Web. Expressions like “here”, “in this country”, “north”, west”, “in the city centre” only make sense when there is a point of reference.