The date given in this paragraph is according to pages 170, 171 of the book Nabonidus and Belshazzar, by R. P. Dougherty, which sets out data according to the famous Nabonidus Chronicle dealing with the fall of Babylon. According to the book Darius the Mede, by J. C. Whitcomb, on page 70, ¶4, page 22 top and page 17, ¶1-4, the night of Tishri (Ethanim) 16 corresponds with the night of October 11-12, Julian Calendar, or October 5-6, Gregorian Calendar, the time we use today. See also page 14, ¶1, under “Cyrus,” of Babylonian Chronology 626 B.C.—A.D. 75, by Parker and Dubberstein, 1956 Edition.
The Watchtower Announcing Jehovah’s Kingdom. April 1, 1965 p. 214