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It appears to have 30 days in October and 31 days in November.

Sorry about that. The perils of artisanal calendaring.

I think you're missing August 13th. As the other commenter pointed out, 13*28 = 264.

I think you may have a point.

Not that big of a deal though. I have nothing planned for that day :)

Thanks, you found it! I was going nuts.