It's official: Amazon is moving its annual Prime Day sale from July to June, the retail giant announced in a blog post on Wednesday. Amazon doesn't usually confirm the timing for Prime Day so far in advance of the sale. The news first appeared in the company's first-quarter earnings statement on Wednesday afternoon. A blog post confirming the June timing followed less than an hour later. In a section about recent company updates, the earnings results included this tidbit: "Shared that Prime Day will take place in most countries in June." Strangely, this news had not been shared publicly before. Amazon's decision to reschedule its flagship sale is a big shakeup for the summer retail calendar. Other major retailers like Walmart, Target, and Best Buy typically run competing sales alongside Prime Day. The Prime Day sale announcement did not include the exact dates when Prime Day will take place in June, but an Amazon spokesperson told Mashable that the retailer would share more details soon.…