In this internet age, it is easy to look things up very quickly, but back at the turn of last century, research was arduous and time consuming. It took many years of research to come to conclusions and then to examine them further in the light of other scripture. Refining is a process, just as cleansing is.
We know that the great pyramids were constructed approx 2,500 years BCE, well before Abraham was even born (in 2018 BCE) and well before the Hebrews became a nation upon their release from slavery in 1513 BCE, so the pyramids could not have been constructed by the Hebrews.
The calculation for 1914 is demonstrated here....in case you are interested.
"Why do Jehovahs Witnesses say that Gods Kingdom was established in 1914?
Two lines of evidence point to that year: (1) Bible chronology and (2) the events since 1914 in fulfillment of prophecy. Here we will consider the chronology. For fulfillment of prophecy, see the main heading Last Days.
Read Daniel 4:1-17. Verses 20-37 show that this prophecy had a fulfillment upon Nebuchadnezzar. But it also has a larger fulfillment. How do we know that? Verses 3 and 17 show that the dream that God gave to King Nebuchadnezzar deals with the Kingdom of God and Gods promise to give it to the one whom he wants to . . . even the lowliest one of mankind. The entire Bible shows that Jehovahs purpose is for his own Son, Jesus Christ, to rule as His representative over mankind. (Psalm. 2:1-8; Dan. 7:13, 14; 1 Cor. 15:23-25; Rev. 11:15; 12:10) The Bibles description of Jesus shows that he was indeed the lowliest one of mankind. (Phil. 2:7, 8; Matt. 11:28-30) The prophetic dream, then, points to the time when Jehovah would give rulership over mankind to his own Son.
What was to happen in the meantime? Rulership over mankind, as represented by the tree and its rootstock, would have the heart of a beast. (Dan. 4:16) The history of mankind would be dominated by governments that displayed the characteristics of wild beasts. In modern times, the bear is commonly used to represent Russia; the eagle, the United States; the lion, Britain; the dragon, China. The Bible also uses wild beasts as symbols of world governments and of the entire global system of human rulership under the influence of Satan. (Dan. 7:2-8, 17, 23; 8:20-22; Rev. 13:1, 2) As Jesus showed in his prophecy pointing to the conclusion of the system of things, Jerusalem would be trampled on by the nations, until the appointed times of the nations were fulfilled. (Luke 21:24) Jerusalem represented the Kingdom of God because its kings were said to sit on the throne of the kingship of Jehovah. (1 Chron. 28:4, 5; Matt. 5:34, 35) So, the Gentile governments, represented by wild beasts, would trample on the right of Gods Kingdom to direct human affairs and would themselves hold sway under Satans control.Compare Luke 4:5, 6.
For how long would such governments be permitted to exercise this control before Jehovah gave the Kingdom to Jesus Christ? Daniel 4:16 says seven times (seven years, AT and Mo, also JB footnote on verse 13). The Bible shows that in calculating prophetic time, a day is counted as a year. (Ezek. 4:6; Num. 14:34) How many days, then, are involved? Revelation 11:2, 3 clearly states that 42 months (3 1/2 years) in that prophecy are counted as 1,260 days. Seven years would be twice that, or 2,520 days. Applying the day for a year rule would result in 2,520 years.
When did the counting of the seven times begin? After Zedekiah, the last king in the typical Kingdom of God, was removed from the throne in Jerusalem by the Babylonians. (Ezek. 21:25-27) Finally, by early October of 607 B.C.E. the last vestige of Jewish sovereignty was gone. By that time the Jewish governor, Gedaliah, who had been left in charge by the Babylonians, had been assassinated, and the remaining Jews had fled to Egypt. (Jeremiah, chapters 40-43) Reliable Bible chronology indicates that this took place 70 years before 537 B.C.E., the year in which the Jews returned from captivity; that is, it took place by early October of 607 B.C.E. (Jer. 29:10; Dan. 9:2; for further details, see the book Let Your Kingdom Come, pages 186-189.)
How, then, is the time calculated down to 1914? Counting 2,520 years from early October of 607 B.C.E. brings us to early October of 1914 C.E., as shown on the chart.
CALCULATING THE SEVEN TIMES
Seven times = 7 X 360 = 2,520 years
A Biblical time, or year = 12 X 30 days = 360. (Rev. 11:2, 3; 12:6, 14)
In the fulfillment of the seven times each day equals one year. (Ezek. 4:6; Num. 14:34)
Early October, 607 B.C.E., to December 31, 607 B.C.E.= 1/4 year
January 1, 606 B.C.E., to December 31, 1 B.C.E. = 606 years
January 1, 1 C.E., to December 31, 1913 = 1,913 years
January 1, 1914, to early October, 1914 = 3/4 year
Total: 2,520 years
What happened at that time? Jehovah entrusted rulership over mankind to his own Son, Jesus Christ, glorified in the heavens.Dan. 7:13, 14.
Then why is there still so much wickedness on earth? After Christ was enthroned, Satan and his demons were hurled out of heaven and down to the earth. (Rev. 12:12) Christ as King did not immediately proceed to destroy all who refused to acknowledge Jehovahs sovereignty and himself as the Messiah. Instead, as he had foretold, a global preaching work was to be done. (Matt. 24:14) As King he would direct a dividing of peoples of all nations, those proving to be righteous being granted the prospect of everlasting life, and the wicked being consigned to everlasting cutting-off in death. (Matt. 25:31-46) In the meantime, the very difficult conditions foretold for the last days would prevail. As shown under the heading Last Days, those events have been clearly in evidence since 1914. Before the last members of the generation that was alive in 1914 will have passed off the scene, all the things foretold will occur, including the great tribulation in which the present wicked world will end.Matt. 24:21, 22, 34." (Information from Reasoning from the Scriptures WTBTS)
