Race Event Calendar?

Is there like a calendar system or something I can look at to know what time specific races are at without having to launch the game up? I have been grinding the NASCAR Daytona circuit and want to know what time it is each days but each day its at a completely different time. I have tried to calculate the time for the race based on what the cycle of courses are but they seem to have some down time because it should be Daytona every 2.5hr but my script and calculations don't turn out correct.

Has anyone looked into this or know a solution?