Georgia Code Title 17. Criminal Procedure § 17-16-5

(a) Upon written demand by the prosecuting attorney within ten days after arraignment, or at such time as the court permits, stating the time, date, and place at which the alleged offense was committed, the defendant shall serve within ten days of the demand of the prosecuting attorney or ten days prior to trial, whichever is later, or as otherwise ordered by the court, upon the prosecuting attorney a written notice of the defendant's intention to offer a defense of alibi. Such notice by the defendant shall state the specific place or places at which the defendant claims to have been at the time of the alleged offense and the names, addresses, dates of birth, and telephone numbers of the witnesses, if known to the defendant, upon whom the defendant intends to rely to establish such alibi unless previously supplied.

(b) The prosecuting attorney shall serve upon the defendant within five days of the defendant's written notice but no later than five days before trial, whichever is later, a written notice stating the names, addresses, dates of birth, and telephone numbers of the witnesses, if known to the state, upon whom the state intends to rely to rebut the defendant's evidence of alibi unless previously supplied.

(c) If prior to or during trial, a party learns of an additional witness whose identity, if known, should have been included in the information furnished under subsection (a) or (b) of this Code section, the party shall promptly notify the other party of the existence and identity of such additional witness.

(d) Upon a showing that a disclosure required by this Code section would create a substantial threat of physical or economic harm to a witness, the court may grant an exception to any of the requirements of subsections (a) through (c) of this Code section.

(e) If the defendant withdraws the notice of intention to rely upon an alibi defense, the notice and intention to rely upon an alibi defense are not admissible. However the prosecuting attorney may offer any other evidence regarding alibi.