As far as I know (by which I mean, I read the wikipedia page on Julian dates), JD-2500000.5 is the definition of MJD.

In any case, see my post below if you're interested in a solution that doesn't require you to rewrite date parsing code.

"What should it profit a man, if he should win a flame war, yet lose his cool?"

In reply to Re^5: how to convert a timestamp to MJD (Modified Julian Date) by Joost
in thread how to convert a timestamp to MJD (Modified Julian Date) by tmacy

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