In Dan.12:2 we read the following regarding Resurrection events: 

Daniel 12:1-2
    At that time… And many of them that sleep in the dust of the earth shall awake, some to everlasting life, and some to shame and everlasting contempt.  

Meanwhile, Dan. 12:6-7 makes it clear that the events of Dan. 12:1-2 (the Resurrection events of the Righteous and the Unrighteous, etc.) with respect to this particular Passage MUST be completed no later than by the end of the time, times and a half. 

Daniel 12:6-7
    And one said to the man clothed in linen, which was upon the waters of the river, How long shall it be to the end of these wonders? [7] And I heard the man clothed in linen, which was upon the waters of the river, when he held up his right hand and his left hand unto heaven, and sware by him that liveth for ever that it shall be for a time, times, and an half; and when he shall have accomplished to scatter the power of the holy people, all these things shall be finished.  

Therefore, the Resurrection events of Dan. 12:2 must occur at the SAME - ‘AT THAT TIME’ (pre-GT).  Why?   

The dead of Dan. 12:2 will BOTH raise TOGETHER (AT THAT TIME) Righteous and Unrighteous – No thousand years gap thus, NOT at two different time intervals.  In Dan. 12:1-2 we find AT THAT TIME where the Hebrew word for ‘time’ is eth is used as a singular and denotes a singular specific time and NOT a plural ‘times’.  If there is a 1000 years gap between those that raise to everlasting life and those that raise to everlasting shame and contempt in Dan. 12:2 then that would be TWO specific periods of time.  

However, the dead following the GT of Rev. 20:4-5 raise SEPERATLY – The Righteous dead at the end of the GT and the Unrighteous dead 1000 years later. 

To this end, how can the ‘Unrighteous dead’ then of Dan. 12:2 be the SAME as the ‘Unrighteous dead’ of Rev. 20:5 seeing that the ‘Unrighteous dead’ of Rev. 20:5 do not rise TOGETHER with the Righteous GT dead – the Unrighteous GT dead as stated rise 1000 years later. 

Moreover, if the Resurrection of the Unrighteous dead of Dan. 12:2 occurs at the end of the Great Trib. then this is in direct conflict with Rev. 20:5 which declares those Unrighteous dead will not live again for 1000 years. 

In summary, to reiterate Dan. 12:6-7 reveals that the Resurrection events, the Deliverance, etc. of Dan. 12:1-2 MUST all be fulfilled/completed no later than the ending of the time, times, and half time (GT).  To this end, there can be NO 1000 years Resurrection gap between the Resurrection of the Righteous dead and the Unrighteous dead with respect to Dan. 12:2.  Jesus Himself declared the same:

John 5:28-29 (emphasis added)
    Marvel not at this: for the hour is coming, in the which all (Strong’s 3956) that are in the graves shall hear his voice, [29] And shall come forth; they that have done good, unto the resurrection of life; and they that have done evil, unto the resurrection of damnation.

Thus, the conclusion is this - there must be a Resurrection ‘event’ before the GT of BOTH the Righteous dead and the Unrighteous dead (Dan. 12:2) followed by a Resurrection event after the GT of the Righteous GT Martyrs ONLY (Rev. 20:4) whereas the Unrighteous dead following the GT will rise 1000 years later (Rev. 20:5).  

Please note:  there are ONLY 2 Biblical Resurrections – the 1^st Righteous and the 2^nd Unrighteous however, there are several ‘getting up’ events with respect to and comprising each of the two Resurrections. 

Finally, short of any unwise theological attempts to both mutilate and disembowel the above stated Scriptures their interpretative summary is straight forward – there will be a pre-Great Tribulation Resurrection/Rapture.