Already you started on a wrong foot . There were always wars,calamities like earthquakes or solar and lunar eclipses . The first thing is to establish time frame and then we seek how can we atttribute a given event to the endtime sign.
Example: there hundreds of solar and lunar eclipses in mankind's history .None of them except one set that occurred in the time period : August ,11,1999 and January,21,2000 was an end-time sign !
To a regular men the solar and lunar eclipses :
Solar on August ,11 ,1999 AD and lunar on Januray ,21,2000 AD were nothing new or extraordinary - we always have had such phenomena .Yet ,these two were the signs of the soon coming end of the world . Why? Because they occurred in the timeframe that was derived from the Bible studies and calculations resulting from them. Read my posts on alt.religion.jehovahs-witn (a google group ).
Had the First World War occurred before 1878 AD it would not have been a sign of the end of the world ! Look the same event one time is a sign of the end but the other time not a sign ! Why ? Because of the differences in time ! The war in 1914 AD-1919 AD is a sign of the end,while the same war some years earlier would not be a sign !
Had the International Bible Students appeared .say, in 1568 AD they would not be that christian organization of the end-time era !
But since they appeared later on the scene and are linked to the dates : 1879 AD,1884 AD,1914 AD ,1918 AD,1921 AD they were the true end-time christian organization !
The same applies to Jehovah's Witnesses ! They had to have had the period : 1935 AD -1942 AD.
If I came up with the mission as that one independent servant from Luke 9.49-50 in the period : 1986 AD - 1993 AD I would not be that servant ! I could not lay claims I am doing .
The period had to be 1984 AD - 1991 AD.
This is God Yahweh the Almighy One working in us in the end-time era and none can thwart God's plans .
The time framework is the basis to rfecognize the end-time signs and to do that we must calculate using the numbers from the Bible . ASnd that is why so many opponents come into view because of that .Satan is using all possible tricks to trick people into not believing the calculations that lead to the establishment of the end-time chronology - the timeline .
If you reject the timeline you don't have the basis in recognizing the end-time signs as these signs look normal to a regular men.
Once the timeline is ridiculed and lost there remains no good convincing reasons to believe such and such events are the end-time sign.
The Book of Revelation is so complex that it is impossible to explain it without plotting out the timeline and then when we have the timeline we may try to interpret the Book of Revelation .