Troubleshoot:Calculating a Start date in excel.

Calculating a Start date in excel.

I am in the process of building a excel spreadsheet for different step of a project with a set number of days for each step.  I am trying to find a formula that will calculate the start date of the project on the end date is entered. 
 
For example I have a class that is starting on April 22, 2014, there are 12 actions that have to take place prior to the start of the classs.  Is there a formula that I can use to calculate the day i have to start the process in order to be ready to start
of April 22, 201?
 
Thank you for you assistance.
 
Al

Keys to the Problem Calculating a Start date in excel.

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