Am I entitled to back wages?

I work for the University I attend. I was due an evaluation for a longevity raise of $0.50 at the beginning of this semester. I informed my direct supervisor and she told me that she was "looking into it" Well here it is the beginning of March and I still haven't had my evaluation in order to get my raise. I finally have one scheduled for this week and I'm wondering if I'm entitled to the money I would've earned had they done my evaluation when they were supposed to? Its a longevity raise so there is really no disputing it so I figured that I was entitled to the extra money.