1. I can decode the bit you can't: the CA-01 is a code for the state and plant where the bleach was produced. I'm not sure what the "S2" is. I'm really surprised you've got California bleach. Mine is coded "FL-01" for Florida, probably the big Allied Universal plant there. I used to buy tanker loads of bleach from them, though from their Georgia plant.

2. Bleach half-life is much more complicated than that. Many makers have switched to high-purity manufacturing units, so they can make bleach that's stable, and won't turn brown. Bleach made with very low contaminating metal ions has a longer life than Chem Geek reported. Here's a link: https://www.powellfab.com/sales_pdfs...er_profits.pdf