Martha said to the Lord that her brother Lazarus will "...rise again in the resurrection at the last day.” [John 11:24]

Martha was referring to the resurrection that we now know is going to take place on the last great day of the feast of tabernacles, on the 6th of November 2020!

when the phrase "the last day" is mentioned in the the book of John, the great day of the feast of tabernacles is the day in view. Hence we read: "On the last day, that great day of the feast, Jesus stood and cried out, saying..." [John 7:37]

We further read: "This is the will of the Father who sent Me, that of all He has given Me I should lose nothing, but should raise it up at the last day [that is, they'll be raised up on the great day of the feast of tabernacles]. 

And this is the will of Him who sent Me, that everyone who sees the Son and believes in Him may have everlasting life; and I will raise him up at the last day [that is, I will raise him up on the great day of the feast of tabernacles]

No one can come to Me unless the Father who sent Me draws him; and I will raise him up at the last day [that is, raise him up on the great day of the feast of tabernacles]. [John 6:39,40,44][words in bracket are mine]

In expanding the following text we read: "Martha said to Him, “I know that he will rise again in the resurrection at the last day [that is, her brother Lazarus will rise again on the great day of the feast of tabernacles].” 

The Lord then goes on to explain to Martha what He's going to do for all believers who die before the last day, as well as for all believers who will still be physically alive on the last day! 

The Lord starts by saying  “I am the resurrection and the LIFE. He who believes in Me, though he may die, he shall live." This means that all those who die as believers before the last day will be resurrected by the Lord on the great day of the feast of tabernacles.

The reason why the Lord said He's also "the life" is because we're still going to be physically alive on the great day of the feast of tabernacles, on the 9th of October, as a consequence we can't experience a resurrection. Instead the Lord is going to bless us with an abundance of life . It's this instant blast of eternal life that's going to transform our natural bodies into glorified bodies. This is why the Lord said "And whoever lives [that is, whoever is physically alive on the great day of the feast of tabernacles on the 6th of November 2020] and believes in Me SHALL NEVER DIE." 

The Lord then asked Martha, "Do you believe this?" ” She said to Him, “Yes, Lord, I believe that You are the Christ, the Son of God, who is to come into the world.” [John 11:24-27] Martha's confession is the evidence that she did indeed receive the gift of eternal life from the Lord. And that even though she's been dead for almost two thousand years, she going to resurrect on the LAST DAY, that is on the great day of the feast of tabernacles, on the 6th of November! 

"...The fifteenth day of this seventh month shall be the Feast of Tabernacles for seven days to the Lord. On the first day there shall be a holy convocation. You shall do no customary work on it. For SEVEN DAYS you shall offer an offering made by fire to the Lord. On the eighth day you shall have a holy convocation, and you shall offer an offering made by fire to the Lord. It is a sacred assembly..." [Lev. 23:34-37]

There's a bit of confusion on how the seven days of this feast are counted. The correct way to count off the feast days is to start the feast from 3:00 PM Jerusalem Time. This means that on Day 1 the evening of Day 15 continues into the evening of Day 16. This is because Day 15 ends at Sunset and the evening of Day 16 begins. 

On Day 1 the evening of Day 15 continues from Sunset into the evening of Day 16. [October 31st]

On Day 2 the evening of Day 16 continues from Sunset into the evening of Day 17. [November 1st]

On Day 3 the evening of Day 17 continues from Sunset into the evening of Day 18. [November 2nd]

On Day 4 the evening of Day 18 continues from Sunset into the evening of Day 19.  [November 3rd]

On Day 5 the evening of Day 19 continues from Sunset into the evening of Day 20.  [November 4th]

On Day 6 the evening of Day 20 continues from Sunset into the evening of Day 21.  [November 5th]

On Day 7 the evening of Day 21 continues from Sunset into the evening of Day 22.  [November 6th] This is the Last Day, the Great Day of the feast! This is when we should expect to be taken up into heaven in the Rapture.

On Day 8, in the morning, the sacred assembly will take place in heaven.

Here's the final proof from the Old Testament that the last day IS the seventh day or the great day of the feast of tabernacles. Nehemiah we read: And they found written in the Law, which the Lord had commanded by Moses, that the children of Israel should dwell in booths during the feast of the seventh month...Also day by day, from the first day until THE LAST DAY, he read from the Book of the Law of God. And they KEPT THE FEAST SEVEN DAYS; and on the eighth day there was a sacred assembly, according to the prescribed manner."[8:14,18] See you all at the Wedding Banquet, hopefully in a few days!