Dictionaries have different rules about word definitions, which might affect how much weight you give their recommendations. The Oxford (in its full manifestation) attempts to record usage and etymology; it is excellent at providing info on 'First Usage'. The Macquarie (OK, I know you're all on about US/UK English) records current usage, no matter how infelicitous it seems. I don't know the policy for Chambers.

McGrath's comment "When Lynne Truss's book Eats, Shoots and Leaves" reminded me of a couple of things. Many would prefer the apostrophe to be bare of the subsequent "s", so that his comment would read "Lynne Truss' book Eats, Shoots and Leaves". When Lynne Truss visited Australia she told the story that she had published it before she'd heard the old Australian joke about the American who was called a wombat when he left his partner 'the morning after'. The punchline required the dictionary definition of a wombat, given as an animal that "eats, roots, shoots and leaves."

And, while you're at it, make sure your software presents date formats appropriately for the target audience.