Sounds like it has been very definite over the last 50 years.
*** w88 10/15 p. 12 par. 13 "This Is the Day of All Days" ***
Thus, John's visionary measuring of the temple sanctuary was a guarantee that during the Lord's day, all of Jehovah's purposes regarding the temple would be fulfilled. In harmony with this and according to all the evidence, those of the anointed who had already died faithful began to be resurrected to their promised place in the heavenly sanctuary starting in 1918. (1 Thessalonians 4:16; Revelation 6:9-11)
*** w86 10/1 p. 14 Comfort From the God of Peace ***
The Watchtower has long presented the view that this resurrection of anointed Christians from death commenced in the year 1918.
*** w79 6/15 p. 29 pars. 9-10 Living Now in That "Last Day" of Resurrection ***
Not yet were those spirit-begotten Christians to be glorified in heaven, to "be caught away in clouds to meet the Lord in the air." Their experiencing this was not scheduled to "precede" the resurrection of Christians who had "fallen asleep in death through Jesus" down till 1918. Rather, as 1 Thessalonians 4:14-17 points out, "those who are dead in union with Christ will rise first." Fittingly, their resurrection first would precede the reviving or resuscitating of the Kingdom proclaimers to their further work in the flesh on earth during this "time of the end." This reviving occurred in spring of 1919.
10 The spiritual resurrection of the "dead in Christ" in the spring of 1918, three and a half years from the enthronement of Christ at the end of the Gentile Times in autumn of 1914, would parallel Jesus' own resurrection on Nisan 16, 33 C.E., "at the half of the week." (Dan. 9:27) Thus they did "rise first." Their doing so did "precede" the resurrecting of those surviving to Christ's "presence," or parousia, and to the killing of Kingdom preaching.
*** w70 6/1 p. 331 par. 22 Do You Have "Faith to the Preserving Alive of the Soul"? ***
The resurrection of the anointed Christians, who number 144,000, is to spirit life in heaven and it began to occur in 1918 C.E., after the establishment of the heavenly Kingdom in 1914. (Rev. 12:1-5; 14:1, 4; 20:4-6; 1 Cor. 15:50-55) Such Christians are "made perfect" in the heavens prior to the earthly resurrection of faithful pre-Christian witnesses of Jehovah.
*** w67 6/1 p. 345 The Wedding That Brings Worldwide Rejoicing ***
Evidence from the prophecies of the Bible and their fulfillment in our time indicates that Jesus Christ came with his Father, Jehovah God, to the temple for judgment in 1918 C.E. He first turned his attention to the members of his Bride who were asleep in death and resurrected them.
*** w67 8/1 p. 455 A New Administration of Earth's Affairs ***
Those who died prior to the establishment of the Kingdom were resurrected at the time of Jehovah's coming to the temple with his messenger of the covenant in 1918.
*** w66 1/1 p. 30 A New Priesthood Begins ***
In 1918 he began to resurrect his faithful congregation to be with him.
*** w66 2/15 p. 123 Does Peter Now Use the Keys of the Kingdom? ***
He had to await in death in the grave, however, for many centuries until the second coming of Jesus Christ to God's spiritual temple, just as did the faithful apostle Paul. (2 Tim. 4:8) In 1918 he was resurrected to the heavens along with the other faithful members of Christ's congregation who had died prior to that time.
*** w65 2/15 p. 102 par. 7 For Whom There Are Resurrection Hopes ***
According to indications in the Bible, their resurrection began in the year 1918 C.E., or three and a half years after Jesus Christ was enthroned and crowned as heavenly King to begin ruling in the midst of his enemies. (Ps. 110:1, 2; Heb. 10:12, 13; Rev. 14:13)
*** w60 7/15 p. 440 par. 6 Staying Awake with the "Faithful and Discreet Slave" ***
It was God's will for the awakening of the remnant on earth to follow the 1918 heavenly resurrection of anointed ones who died prior to that time. (Rev. 11:18)
*** w60 8/1 p. 462 "Creating New Heavens and a New Earth" ***
The spring of A.D. 1918 marked the opening of the temple to the King's entrance and thereafter the resurrection of the anointed Christians who, along with Jesus, make up "the temple of the living God."-2 Cor. 6:16.
*** w59 2/1 p. 84 par. 28 Maintaining Our Spiritual Paradise ***
Since the setting up of the heavenly kingdom in 1914 and since the coming of Jehovah and his Messenger of the covenant, Jesus Christ, to the spiritual temple in 1918, the dead apostles and other spirit-begotten Christians who died faithful prior to those events have been resurrected.
*** w59 6/1 p. 347 The Resurrection Hope ***
Fulfillment of Bible prophecy indicates that the resurrection of these body members of Christ began when he came to his house for judgment in 1918.
*** w58 8/1 p. 464 Calling the Members of the Kingdom of Heaven ***
The "man not clothed with the wedding garment" actually represents a class of people who were made manifest after Jehovah accompanied by Christ Jesus came to the temple for judgment A.D. 1918. The present time, since that year, is when the marriage of Jehovah's Son is being consummated by resurrecting all the spirit-begotten saints who died faithful before 1918 or have since died and uniting them in never-ending wedlock with the heavenly Bridegroom.
*** w55 3/15 p. 174 Part 6-1914 Date Verified ***
Individually, however, some who had shared in giving that warning were disappointed in that they incorrectly thought of themselves as due to go to heaven in 1914 to become part of the invisible Kingdom organization, little realizing that it was not until 1918 that it would become possible for any of the dead Kingdom heirs to be joined with Jehovah's enthroned Christ in heaven, at which latter time the "first resurrection" was due to begin.
*** w54 4/1 p. 220 par. 14 The "Likeness of Melchizedek" ***
Christ has been invisibly present in his kingdom since A.D. 1914, and those who died faithful belonging to him as members of the royal priesthood have had this "earlier resurrection" since his coming to the temple in 1918.-Mal. 3:1-5; Rev. 11:15 to 12:5.
*** w54 5/1 p. 285 par. 25 Resurrection Our Strength-giving Hope ***
The time is steadily drawing closer when it will be a reality, not only to members of the 144,000, resurrected since 1918, but to those who will live on earth.
*** w54 6/15 p. 372 par. 12 The Revelation of Jesus Christ ***
The use of this word points to Christ's appearance in the temple for judgment in 1918 and marks the beginning of favorable judgment, first, in the resurrection of the anointed already asleep in death (2 Tim. 4:8) and, second, in the entrusting of Kingdom interests to those of the anointed found faithful on earth.
*** re chap. 17 p. 103 par. 12 'Slaughtered Souls' Rewarded ***
All the evidence indicates that this heavenly resurrection began in 1918, after Jesus' enthronement in 1914 and his riding forth to start his kingly conquest by cleansing the heavens of Satan and his demons.
*** re chap. 38 p. 274 par. 6 Praise Jah for His Judgments! ***
It was in 1918 that Jehovah began rewarding 'those fearing his name, the small and the great'-the first of these being the anointed Christians who had died faithful, whom he resurrected and stationed in the heavenly ranks of the 24 elders. (Revelation 11:18)