Does bleach have a shelf life or expiration date?
Most (concentrated) bleach (before being opened) has a shelf life of up to 6 months at room temperature (~ 73F). A solution of bleach and water has a shelf life of ~ 25 days and will decrease in killing effectiveness every day after it has been mixed. Generally speaking, after opening a 1-gallon container of bleach, it should be used up within 3 months or disposed due to its inability to render potential biohazards neutral.
