Midnight question for all you night owls out there...

I'm writing a short scifi story with a dystopian setting. It opens with the main character's diary. It is told through her diary entries. I'm thinking about switching perspectives with other characters diary entries. I'm happy with where my writings going so far and I'm improving at characterization but I'm not exactly sure if it follows a convincing diary format. How do you think a story told through diary entries should differ from a standard first person perspective?