Interestingly it was also a Thursday, June 12th which they announced at E3. I agree that 7/17/17 is the most likely date at this point, which is a Monday... we will know in a few days ^_^
Yes three days after, but Bungie is notorious for their breaks and a lot of people will take vacation during that period so I consider the 17th more likely. We will soon find out ^_^