Both the Internal Revenue Code and Illinois statutes refer to the 900-hour requirement as being in a "school year" and not a "calendar year," which is how almost everyone files their tax return.
Neither source defines "school year" in this context, but everyone knows that, for K-12 education, it's a period of roughly August through May, depending on the area of the country.
By the normal definition, then, you should be safe to make a claim if you worked at least 900 hours in that August - May timeframe -- one "school year."
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