[Cronos]

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Then, next you make it september 11 - as per the Gregorian calendar.

Yet the Gregorian calendar reforms happened only in 1582 under Pope Gregory XIII

Prior to that was the Julian calendar.

So what calendar is the article referring to?

[Sontagged]

I know, I thought of that recently. But I think the power this day has had over the enemies of Christ and the freedom that Judeo Christianity warrants, tells the truth of it as well.