Okay, I asked Clorox about it and here's the reply :

"Thank you for contacting us about Clorox Bleach - Regular Scent. We always appreciate hearing from our consumers.

Clorox Bleach - Regular Scent has a recommended shelf life of one year. However, disinfecting properties tend to deteriorate after the first 3 months. Clorox Bleach - Regular Scent will degrade at temperatures above 70 degrees F.

To determine the when your product was made there should be a production code stamped in black on the bottle. An Example would be A85117. This would be read as follows:

Plant Code: A8

Year: 5 = 2005

Julian Date: 117 which represents the 117th day of the year. This would be April 26th.

The PH level of Clorox Bleach - Regular Scent is 11.4.

Again, thank you for contacting us."

Frankie