Section 337.9 - Effective date of naturalization(a) An applicant for naturalization shall be deemed a citizen of the United States as of the date on which the applicant takes the prescribed oath of allegiance in an administrative ceremony or in a ceremony conducted by an appropriate court under § 337.8 of this chapter.56 FR 50500, Oct. 7, 1991, as amended at 60 FR 37804, July 24, 1995; 66 FR 32147, June 13, 2001; 76 FR 53803, Aug. 29, 2011