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.…