Wow. You're an Evangelical Protestant but you subject the Bible to the word of the "scientific community." Are there any more like you?
Since the instructions for intercalating the Jewish calendar are not written down in the Bible, I guess the calendar by which all the Biblical holidays are dated is "unscriptural" too. After all, everything that Israel needed to know had to be written down in the text, didn't it? Otherwise it would be so unfair to all those Protestants trying to "get saved."