Take a look at this:
***w99 5/1 pp. 16-17 "Let the Reader Use Discernment" ***
This has a direct bearing on discerning when "the disgusting thing" stands in a holy place. Recall what happened in the first century. The Romans attacked Jerusalem in 66 C.E., but they abruptly withdrew, which allowed Christian "flesh" to be saved. (Matthew 24:22) Accordingly, we expect the great tribulation to begin soon, but it will be cut short for the sake of God’s chosen ones. Note this key point: In the ancient pattern, ‘the disgusting thing standing in a holy place’ was linked to the Roman attack under General Gallus in 66 C.E. The modern-day parallel to that attack—the outbreak of the great tribulation—is still ahead. So "the disgusting thing that causes desolation," which has existed since 1919, apparently is yet to stand in a holy place. How will this happen? And how can we be affected?
***dp chap. 15 p. 269 The Rival Kings Enter the 20th Century ***
24What "disgusting thing" has been "put in place" in modern times? Apparently, it is a "disgusting" counterfeit of God’s Kingdom. This was the League of Nations, the scarlet-colored wild beast that went into the abyss, or ceased to exist as a world-peace organization, when World War II erupted. (Revelation 17:8) "The wild beast," however, was "to ascend out of the abyss." This it did when the United Nations, with 50 member nations including the former Soviet Union, was established on October 24, 1945. Thus "the disgusting thing" foretold by the angel—the United Nations—was put in place.
Is this a contradiction? I wonder who proof-reads these things before its sent off to be printed?