であれば、だ。西暦元年を起点にしていれば、 キミたちは生まれる事なく世界は終わった筈だ。
Jadi, berdasarkan kalender Barat, itu artinya dunia seharusnya berakhir sebelum kalian dilahirkan.
So, going by the Western calendar, that means the world should have ended before you were even born.