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If you want to know with maximum certainly, your best bet is to read the terms that came with your account and ask if there are terms you don't understand.
There are cards of both varieties. Some offer an "Introductory APR" of zero percent for 6, 12,18 or whatever months. In those cases, the APR will be zero for the first X number of months the account is open, and then go to the "go to rate) of whatever -- say 15%). A purchase made in month 5 of a 6 month "intro" period would only get one month at zero apr.
There are cards of the second variety. For instance, a Firestone credit card might offer "6 months deferred interest" on purchases of over, say, 300 dollars. This is a regularly offered deal. Someone with this card could have the card for many years and each time they make such a purchase, they get the "deferred interest" offer. Note that with this type of card the interest is usually "deferred" rather than a true 0.0% -- it typically won't be charged if the cardholder makes the minimum payment for 6 months and the entire purchase is payed off in that time. But if those conditions are not met, the card likely charges interest that had been accumulating since the original purchase.
So there are both kinds of cards. I think it is fair to say that the second kind of card is usually a "store card" that is good only at one particular store (e.g., Amazon.com; JCPenney, GoodYear, etc) and the first kind is more likely to be a VISA, Mastercard, Discover, or AmEx card that can be used at many places.