For a thorough understanding of the time frames referred to as "Great Tribulation" and "Day of the Lord," please study our free booklet, "The Great Tribulation and the Day of the Lord."
When trying to understand Biblical prophecy, it is critical that we are familiar with the meaning of certain key prophetic phrases. For instance, all these terms listed in the Question have a FUTURE prophetic application. This means that when we read a passage in the Old or New Testament, which uses one of these phrases, we should recognize that the passage refers to the future!
Here is an overview of the meaning of these phrases:
The LATTER DAYS:
These chapters describe an attack of Gentile countries against "Israel." Some have concluded that this attack will occur PRIOR to the return of Jesus Christ. Others believe that it is the same attack which is described in the 20th chapter of the book of Revelation; that is, at the END of the Millennium or about 1,000 years AFTER Christ's return.
In the last two Q&As http://www.eternalgod.org/qa/10927 and http://www.eternalgod.org/qa/10990 on the order of prophetic events, we discussed Christ’s sayings in Matthew 24, showing that prior to His return, there would be religious deception, wars, famine, disease epidemics and pandemics, a Great Tribulation (including a martyrdom of the saints and an European attack on the USA, Great Britain, Canada, Australia, New Zealand, South Africa and the state of Israel), heavenly signs, and a time described as God’s wrath, which will be poured out over this entire world.
"You are the light of the world. A city that is set on a hill cannot be hidden."
-Matthew 5:14