Release date mismatch

I'm currently looking on this game: http://www.giantbomb.com/dragon-fantasy-book-ii/3030-39473/
And it says "First release date: Q2 2013"

While browsing the same game with the API: http://www.giantbomb.com/api/game/39473/?api_key=yourkey
You only get:
<expected_release_day/>
<expected_release_month>4</expected_release_month>
<expected_release_quarter/>
<expected_release_year>2013</expected_release_year>
<original_release_date/>

Which doesn't match up with the "Q2 2013" information.

Unless you treat known expected_release_month, unknown expected_releast_day as an expected_release_quarter for the expected_release_month?

Please tell me if that's the case.