What are the options if a fact witness in a civil case writes an affidavit that is filed with the court and later finds out that the affidavit is simply wrong? For example, the affidavit said that person A was in my office on July 31st of the past year and the person writing the affidavit reviews his files and finds that the office building was closed by the fire department on that day due to a natural gas leak. The meeting was supposed to take place on July 31st but actually the meeting took place on August 31st. If the person who wrote the affidavit knows that the date is crucial to the case, should the person take any steps to correct the affidavit? Let's assume that the error works to the advantage of the person on whose on behalf affidavit was written.
Clarification: This is in the state of Georgia, USA.