I had all the tires replaced on my new Kubota in the first year I had it. One day I was servicing it and noticed they were all cracking on the sidewalls. So I contacted Carlisle (my tires are the Titan Trac Loader brand) and they sent me 4 new tires. They were awesome to deal with.
She also sent me this info about date codes:
When purchasing Cars, Trucks, Tractors anything with tires. You will have a date code, the date code tells the story. Weather cracking does come from tires just sitting in one area for a period of time. You can always request for your tires to be change before purchasing the unit. Example how date code work if you have date code with C4 THAT LOCATION. 10 HOW MANY WEEKS 15 WILL BE YEAR? IT WILL APPEAR ON YOUR TIRE AS C4 1015