Haven't got a CD-ROM, Doug?
W 2/1, 1964:
By the calculation above, Cyrus’ first regnal year would end on March 5 of 537 B.C., or toward the end of the rainy season. Doubtless he considerately issued his decree near the end of the rainy season, shortly before March 5 of 537 B.C., and in that way the exiled Israelites could make arrangements to travel in the convenient dry season from April through September. They evidently made the four-month-long journey from Babylon during the dry months, for by October they were back and settled in their beloved homeland, before the first day of their seventh lunar month.—Ezra 3:1.
W. 8/15, 1968:
Two centuries earlier Jehovah by the mouth of his prophet Isaiah had declared: "[I am] the One saying of Cyrus, ‘He is my shepherd, and all that I delight in he will completely carry out’; even in my saying of Jerusalem, ‘She will be rebuilt,’ and of the temple, ‘You will have your foundation laid.’" (Isa. 44:28) Without further delay this two-hundred-year-old prophecy was about to be fulfilled. Cyrus acceded to the throne and "in the first year" of his reign, at least before the spring of 537, "Jehovah roused the spirit of Cyrus." He issued the famous edict permitting the Jews to return and rebuild Jehovah’s temple, copies of which were written and circulated throughout the realm. This allowed sufficient time for the Jews to resettle in their homeland, ‘establish the altar firmly upon its own site,’ and "from the first day of the seventh month" start offering up burnt sacrifices to Jehovah. This date, the "first day of the seventh month," according to the best astronomical tables available, is calculated to be October 5 (Julian) or September 29 (Gregorian) 537 B.C.E.—Ezra 1:1-4; 3:1-6.
Here, then, very definitely established, is another milestone—the time when the seventy years of desolation of the land of Judah came to an end—about October 1, 537. (Jer. 25:11, 12; 29:10) It is now a simple formula to determine when the seventy years began. One has only to add 70 to 537 to get 607. So about October 1, 607 B.C.E., the desolating of the land of Judah and the complete emptying out of its inhabitants was fully accomplished.
Insight, "Chronology":
Jerusalem came under final siege in Zedekiah’s 9th year (609 B.C.E.), and the city fell in his 11th year (607 B.C.E.), corresponding to Nebuchadnezzar’s 19th year of actual rule (counting from his accession year in 625 B.C.E.). (2Ki 25:1-8) In the fifth month of that year (the month of Ab, corresponding to parts of July and August) the city was set afire, the walls were pulled down, and the majority of the people were led off into exile. However, "some of the lowly people of the land" were allowed to remain, and these did so until the assassination of Gedaliah, Nebuchadnezzar’s appointee, whereupon they fled into Egypt, finally leaving Judah completely desolate. (2Ki 25:9-12, 22-26) This was in the seventh month, Ethanim (or Tishri, corresponding to parts of September and October). Hence the count of the 70 years of desolation must have begun about October 1, 607 B.C.E., ending in 537 B.C.E. It was in the seventh month of this latter year that the first repatriated Jews arrived back in Judah, exactly 70 years from the start of the full desolation of the land.—2Ch 36:21-23; Ezr 3:1.