Excel file to work on both pc & mac - repost

We have an excel file which has 4 tabs for a football club to handle registrations, and it generates reports from some of the data. Each tab has some basic macros and basic VBA code within. As the user is now working of both a pc and a mac, we need to convert the code and macros to be operating system friendly. We need someone that can hit the ground running and turn this around within a short time frame (less than a day) and estimate 1 hours work for the right person (you can get a lot done in 1 hour ).