I can’t say I’d be surprised if it turned out their system is incapable of “TBD” as a release date. Given what Reikon said earlier in this thread, it seems clear Suika definitely no way, no how, was releasable in 2 weeks. Equally clueless programmers have made equally egregious slipups in the past, with decidedly unfunny results: http://www.snopes.com/autos/law/noplate.asp
And that example actually mattered. This is exactly the same mistake as we see MangaGamer making: they should have an extra boolean field in their database ReadyForRelease. Since they haven’t got such a thing, “hilarity” ensues. I’m surprised they haven’t started on the workaround of “all games release in 2099 until they’re actually ready for release”.