Employment Years of Service for future date formula

Hi,

I was hoping someone would be able to please give me the formula to calculate someone's years and months of service with a company assuming a future end date.

For example if someone was hired 12/2/02 and was terming the company as of 06/30/12, what formula can I plug in to get the years of service and months with the organization?

Thanks so much!

Unfortunately, it gives me an error response saying you have entered too many arguments for this function - Can you please help with this and plug in my dates and test it out and then perhaps send me the answer?

Thank you so much!

One more thing I am on Excel 2010 version - hope that helps.