According to the Bible’s timetable, those Gentile Times, beginning in 607 B.C.E. with Jerusalem’s destruction and desolation and running for 2,520 years, would end in the early autumn of the year 1914 of our Common Era. (Luke 21:24)
... 38. To what year had Jehovah’s witnesses pointed forward as marking the close of “the times of the Gentiles,” what did God’s kingdom begin to do then, and to whom does God’s challenge now ring out?
38 For decades in advance, by means of the Watch Tower Society publications, the Christian witnesses of Jehovah were pointing ahead, not to the year 1917, but to 1914 as being the year for the close of “the times of the Gentiles.” (Luke 21:24, Authorized Version)