Christmas day formula

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Chroma

@MattVonFat: exactly. Christmas falls on a tuesday in 2080. Then just use that as a start instead of 1990. And since 2080 (tens) start with an even number you would could 80 as 1 point, 2070 as 2 etc etc.

Here's how I would do it.

2080 = 1 point
2070 = 2 points
2060 = 1 point
2050 = 2 points
total = 6

Now add 6 days to Tuesday and you get Monday.

2045's leap years are 2040, 2044 and 2048. Advance 1 day for non-leaps years and 2 days for leap years.

2040 = Monday
2041 = Tuesday
2042 = Wednesday
2043 = Thursday
2044 = Saturday
2045 = Sunday

I haven't double check but according to my formula, Christmas should fall on a Sunday in 2045.

going to check.

Ok, seems I'm one day off. Lemme see what went wrong.