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July 6, 2015 was a Monday — that’s 4,040 days ago. Below you can see exactly how to work the weekday out in your head with the Doomsday algorithm, along with a few other facts about the date.
Same month, one different day. You already know July 11 is a doomsday — count from there.
July 17, 2015
The Doomsday algorithm is six short steps. Most people get to a reliable answer in under 30 seconds after an afternoon of practice.