We have a client who amended his plan to include safe harbor match as of 1/1/07. He did almost everything right - posted his notice on time, handed out a new SPD with the notice, enrolled his employees on time, started deductions as of the very beginining of the year and has made the safe harbor match to all eligible ee's from day one as well. However, he actually signed the document on the first business day of 2007 - 1/2/07.
Is this a valid safe harbor plan for 2007? Everything I've read says to adopt 'before' the beginning of the plan year. Is there some stretch of logic that would make this valid - i.e. he signed it at the very beginning of the day

In operation, the employees were not damaged in any way - they knew about the safe harbor in a timely manner and were able to defer and receive the match from day one.
He just put pen to paper one day late. Thanks so much for your help.