If I order a magazine subscription in the middle of the year? Please answer?

So, I'd really like to order a one year subscription of Seventeen Magazine, but it's already June. What I want to know is: if I order the subscription now, is it only good until December of this year, or June of next year? Is the subscription only good for 2011, or will it actually extend for the full 12 issues since I place my order? I'm sorry if this seems like a stupid question, but no one here seems to know. Are all magazines like this? Thanks so much!