Clean install of Yosemite problem
Just in case anybody else comes across this question, the steps to solve the system time/date issue mentioned above are as follows.


Click on Utilities –> Terminal
When the terminal window opens, type date and hit enter. What you will notice is that the date listed will be wrong.  That wrong date is what is causing the reinstall error.
To correct the wrong date –>  type date followed by MMDDHHMMYYYY  (Month – Date – Hour – Minute – Year)
Exit and begin a new install, the problem should now be solved.