Can I buy coffee now when I’m not going to give it as a gift until a week/month from now?

Yes you can. However, it is advisable to keep the coffee unopened in its own packaging. If you wish, coffee can be put in an airtight package put in the freezer. However, make sure that the package has reached room temperature before it is opened – otherwise cold coffee powder or beans will absorb humidity to itself, which will negatively affect the taste of the coffee.