The Last Day
Whenever Satan usurped dominion over the earth from Adam and Eve, God began to reveal His plan to restore things back to the way they were before sin entered the world (Genesis 3:15). He continued this revelation through Abraham and the prophets of the Old Testament. There would come a day when Satan’s kingdom would be destroyed (Jeremiah 51:25) and God’s wrath would be poured out on the wicked (Isaiah 13:9). On that day, Jesus will return and the kingdom of God will be established on earth (Daniel 2:35,44) That day is known as the day of the Lord, the day that Satan’s ruling of the world ends and the rulership of Jesus begins. It will literally be the day of the ultimate regime change.
There’s a lot that is said about the day of the Lord in the Old Testament. In the New Testament, Paul tells us that it is the day when the righteous are gathered together to Jesus (2 Thessalonians 2:1-2) which takes place after a mass resurrection of believers (1 Thessalonians 4:16-17). Jesus said that this mass resurrection of those who believe in Him will take place on the last day.
“For this is the will of My Father, that everyone who beholds the Son and believes in Him will have eternal life, and I Myself will raise him up on the last day.” John 6:40 NASBThe last day occurs on the day of the Lord. When considering all of the scriptural characteristics of that day, it is the day that Jesus leaves heaven and returns to earth to begin the time of restoration of all things (Acts 3:21). Those who belong to Christ are made immortal and Satan's kingdom is destroyed along with all those who chose to follow him. The meek will then inherit the earth and live under the rule of Jesus. Based on what we read in Revelation 20, that day, or period of time, will continue on for at least 1000 years.