Forum:Harry Was Brought to the Dursleys on November 3rd?

So, I'd like to bring to your attention an issue that I found with the times in the books. I want someone to show me (and my friend) that I'm wrong, but we can't seem to do so ourselves.

This is a quote from Dudley Dursley's Wikia page:

"On the night of November 1st in 1981, Harry was delivered to the Dursleys after the attack on the Potters in Godric's Hollow."

I want to bring this to your attention because of something my friend found. Out of curiosity, he wanted to know the dates of when the series started and when it ended. So he looked at a calendar that went back to 1981 (the year Harry would have been a year old) and looked for the first possible Tuesday following October 31st (the day that the potters were attacked). This, of course, is in reference to the, "dull, gray Tuesday our story begins."

The issue that we found was that that first Tuesday following October 31st, was actually November 3rd. What we wondered was if, perhaps, there was some error that we'd found; if, perhaps, we'd somehow got the dates wrong?

I promise, we're not trying ot nitpick the books. It's just something we happened to come across as my friend was being a weirdo.