Hi, Brandi! It's not so hard to find once you know the right buttons to push, and since my husband tells me I always know which buttons to push, I'll share my expert advice with you!
First, you'll want to visit this link
Disney Parks Calendar. It will say "Park Hours and Updates" on the page, and just under that to your right is a blue calendar box. Push that button, and you'll be able to choose the month of March. Pick a date in March, and it will take you directly to the hours for the parks for that day.
If you want even more information, scroll down to the theme park you want to visit, and click the name of the park. That takes you to the calendar for only that park. You can click on any day you'd like, and it will bring up the schedule of extra magic hours, parade times, fireworks, etc.
The only thing you wont' be able to get are times for specific shows (other than the big ones, like Fantasmic!). Those schedules change frequently, and are available when you enter the theme parks.
I hope you have a wonderful vacation!