This is a timeline of major events associated with the attack on Sony's PlayStation Network and Qriocity online services. Dates are given relative to the location the events took place. Sony announcements, released globally, are listed according to their publication in the U.S. See also "PlayStation Network Security Breach: A Survival Guide."

Tuesday, April 19

Sony learned its PlayStation Network and Qriocity networks had been compromised. At the time, the company did not announce this. It was subsequently disclosed in a statement issued by the company's U.S. subsidiary on April 26.

Wednesday, April 20

Sony took its first public step by closing down the two networks, but it didn't disclose what it already knew: the networks had been hacked. It issued a statement that said, "We're aware certain functions of PlayStation Network are down. We will report back here as soon as we can with more information."

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