Are JWs false prophets? Compare these three quotes:
*** w59 1/15 p. 39 Down with the Old -- Up with the New! ***
People should listen to the plain preaching by the remnant prefigured by Jeremiah, for these preach to men the present-day fulfillment of Jeremiah's prophecies. Who made them a prophet to speak with the authority that they claim? Well, who made Jeremiah a prophet? .... He did not make himself a prophet. He could not have done so, especially since he was set apart to be a prophet before he was born. Still he could of his own accord agree to and submit to serving as a prophet when told of the vocation for which he was marked out.... Came the year 1919, and the work of witnessing to the nations in fulfillment of Jesus' words was still there to do. It faced all men who claimed to follow and obey Jesus. In that opening year for postwar decisions and work the question of highest importance to Christendom and to all who called themselves Christians was, not, Should all nations get together in a peace league -- but, Who will be Jehovah's prophet to the nations, to speak to them everything that He should command? Who will be the modern Jeremiah?....
The fact that decides the answer to the question is, not, Do all the clergy of Roman Catholicism and of Protestantism agree that Jehovah's witnesses have been and are God's prophet to the nations -- but, Who discerned the divine will for Christians in this time of the world's end and offered themselves to do it? Who have undertaken God's foreordained work for this day of judgment of the nations? Who have answered the call to the work and have done it down till this year 1958? Whom has God actually used as his prophet? By the historical facts of the case Christendom is beaten back in defeat. Jehovah's witnesses are deeply grateful today that the plain facts show that God has been pleased to use them.
***g68 10/8 p. 23 A Time to 'Life Your Head' in Confident Hope***
True, there have been those in times past who predicted an "end to the world," even announcing a specific date. Some have gathered groups of people with them and fled to the hills or withdrawn into their houses waiting for the end. Yet, nothing happened. The "end" did not come. They were guilty of false prophesying . Why? What was missing? Missing was the full measure of evidence required in fulfillment of Bible prophecy. Missing from such people were God's truths and the evidence that he was guiding and using them.
*** g93 3/22 Why So Many False Alarms? ***
Jehovah's Witnesses, in their eagerness for Jesus' second coming, have suggested dates that turned out to be incorrect. Because of this, some have called them false prophets. Never in these instances, however, did they presume to originate predictions "in the name of Jehovah." Never did they say, "These are the words of Jehovah." The Watchtower, the official journal of Jehovah's Witnesses, has said: "We have not the gift of prophecy." (January 1883, page 425).....They are voicing expectations based on their own interpretation of some scripture text or physical event. They do not claim that their predictions are direct revelations from Jehovah and that in this sense they are prophesying in Jehovah's name. Hence, in such cases, when their words do not come true, they should not be viewed as false prophets such as those warned against at Deuteronomy 18:20-22. In their human fallibility, they misinterpreted matters.