Write some Software i need to be able to link 2 different timetable or scehdules fitness site access other timetables

I have a fitness site where trainers upload there current timetable but they have to manually enter there timetable information when there classes are on times dates etc... what I want is for them to be able to download software from my site install it on there own office or work computer or where ever they use there timetable software. I want the software to update all there timetable information to our site. thus saving them time to have to manually re enter all timetable information.