How do I create a formula field that changes a date field to the the the current month?

Please post your formula, and not just the error message.

I am trying to create the formula - the error message is from the previous post - I tried a formula above and received an error 
currently I am having no luck 
What i am trying to do in an employee data base - is have a field that counts the number of years since the start date of employment

Please post your formula so i can correct it. 

I don't have time to re-type it, just copy and paste the formula from the formula box into this forum.