The Beta for Destiny will begin on the 17th of July, 2014, at 10AM PDT. This is a Thursday, and the first wave of openings will begin for PlayStation 4 and PlayStation 3 only. The Xbox One and Xbox 360 opening will be beginning the following Wednesday.
The release for both PlayStation and Xbox systems for Destiny will require either PlayStation Plus or Xbox Live Gold for some features. Possibly for all features, that is to say, as Destiny is essentially an online-only game. Of special note is the fact that the Bungie press release suggests "subject to change" when mentioning Xbox Live Gold in particular.
Watch live video from BurnsyDelight on TwitchTV
Destiny Beta Openings
July 17th, Thursday, 10AM PDT: PlayStation 4, PlayStation 3
July 23rd, Wednesday, 10AM PDT: Xbox One, Xbox 360
There will also be a scheduled maintenance period on the 21st and 22nd, followed by another several days before the second closing before final release.
Destiny Beta Closings
July 21-22, Monday-Tuesday, Closed for maintenance
July 27th, 11:59PM PDT: Closed for all platforms until final release
This means the Xbox platforms will have 3 days fewer than the PlayStation platforms to play the Beta - but don’t fret. Nothing you collect during the Beta will move over to the final release anyway. You’ll be starting fresh on 9.9.2014 on all platforms, all at once.