Need to change date of my last day of work

I just realized I have a college orientation the day after my last day as a CP employee. I've been hired for the 2014 season for like a month or so already. So I want to get out a day earlier. Can I do that and will they hate me?! So like Aug 10 is my last day but I want my last day to be Aug 9. Because I have to be at my college in GA the next morning

Call the phone number of your manager listed on your contract. Tell them what's going on. Most likely, they won't have an issue with it.