What's the expiration date for a coffee bean the size of roasting?

pu1. The expiration date is 6 months if you keep it in the freezer. It just tastes worse as time goes by

2017-12-27

OK

pu2. Since coffee is roasted at high temperatures, it goes through a certain sterilization process, and the moisture in green beans evaporates during this process, so the storage period is longer than other foods. In the case of coffee beans sold on the market, the expiration date is indicated as one to two years

2017-12-27

OK

pu3. It's usually best to drink two weeks after roasting. When you buy ground coffee beans, it is recommended to consume them within at least three days, and sometimes they are kept in the refrigerator, which is not a good way unless they are kept for six months to a year

2017-12-27

OK