SOLUTION: If 10th October 2014 is a Friday, then what was 3rd September 2013?

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Question 1023196: If 10th October 2014 is a Friday, then what was 3rd September 2013?
Found 2 solutions by 10005, Edwin McCravy:
Answer by 10005(1)   (Show Source): You can put this solution on YOUR website!
Pretty sure it would be a Tuesday.
Answer by Edwin McCravy(20054)   (Show Source): You can put this solution on YOUR website!

If 10th October 2014 is a Friday, then what was 3rd September 2013?
Let's figure it out.

10th October 2013 was a Thursday, because from a non-leap year to the
next non-leap year, each date moves forward 1 week day, because
365 days is exactly 1 more than a multiple of 7, and 364 = 52*7 

One week earlier, 3rd October 2013 was also Thursday. So  
1st October was 2 days before Thursday, which would be a
Tuesday.

That means the 30th September 2013 was Monday. Subtracting 
4 weeks or 28 days from the 30th gives that 2nd September 2013 
was also on Monday, so 3rd September 2013 was a Tuesday.

Edwin
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