I'm looking for a rigid, localized, natural-language specification for time ranges, though. Not supporting some words or combinations of them is fine, as long a

I'm looking for a rigid, localized, natural-language specification for time ranges, though. Not supporting some words or combinations of them is fine, as long as it's natural enough that a nontechnical user doesn't need to use a manual to figure out how to search dates. I'm sure this isn't a trivial problem, hence why there are no obvious solutions, but I'm not ready to believe that it's impossible.