I get the feeling that this subject has been discussed ad nauseam before, but I had to show you the following quote that I found in page 239 of “The Truth Shall Set You Free”, a book published in 1943 by our favorite publishing company. The title couldn’t be more ironic.
By the same rule the "seven times", or "times of the Gentiles", amount to 2,520 years. In Nebuchadnezzar's time the year began counting from the fall of the year, or about October 1, our time. Since he destroyed Jerusalem in the summer of 606 B .C., that year had its beginning in the fall of 607 B .C. and its ending in the fall of 606 B .C. Inasmuch as the count of the Gentile "seven times" began its first year at the fall of 607 B .C., it is simple to calculate when they end. From the fall of 607 B .C. to the fall of B .C. 1 is exactly 606 years. From the fall of B .C. 1 to the fall of A.D. 1 is one year, do not forget. Hence from the fall of B.C. 1 to the fall of A .D. 1914 is 1,914 years. Add now 606 years and 1,914 years, and the sum total is 2,520 years, ending in the fall of A.D. 1914.
Here the Watchtower not only is it lying (Babylonian years started in March or April, never “about October 1, our time”, but also the WTS is counting on their readers’ intelligence to be below average. And, since there was no indication of massive quitting in the 1940’s, then the average intelligence of JW’s was below average, or most never read the book. As late as 1943 the WTS still uses 606 B.C. as the year of the fall of Jerusalem, and tries to correct their zero error in calculating 2,520 years of the “Gentile Times” by explaining that to calculate the time between two events you go back one year from the starting point and then subtract this new date from the end date. It’s as if I were saying “I was born in Sept. 1965, but to figure out my age in Sept 2012 you start counting from Sept. of 1964. Therefore I am 48 years old” What????!!!!