Thursday, July 12 2012 through Sunday, July 22 2012.
Each day of the sale starts at 6.00pm GMT (1.00pm ET)
Steam Summer Sale Badge: All steam customers have the opportunity to earn a Summer Sale badge. At time of writing, it is unclear if there will be any award for this achievement but at the start of the promotion it did say limited availability. The badge is unlocked after completion of three of the tasks. It is then upgradeable twice by completing the remaining tasks. I will report further information on the Badge when it becomes available.