Is the secret coming and the second coming of Jesus different?

Ephesians 3 tells us that the time we live in is called the Age of Grace or the Grace Administration. Our accomplishments in reaching others with the truth of God's Word will cause us to rejoice at the gathering together when Christ returns. The administration following the Age of Grace is called "the day of Christ" or "the Lord's day," when the Lord himself shall rule in righteousness, power, and glory.

I Thessalonians 2:19 "For what is our hope, or joy, or crown of rejoicing? Are not even ye in the presence of our Lord Jesus Christ at his coming?"

The Day of Christ is commonly referred to as the Second Coming. The children of Israel awaited the coming of the redeeming Messiah. They looked forward to his first coming, just as we look forward to his second coming.

Philippians 1:10 "That ye may approve things that are Excellent; that ye may be sincere and without offence till the day of Christ;"

Philippians 2:16 "Holding forth the Word of life; that I may rejoice in the day of Christ, that I have not run in vain, neither laboured in vain."

II Thessalonians 2:2 "That ye be not soon shaken in mind, or be troubled, neither by spirit, nor by Word, nor by letter as from us, as that the day of Christ is at hand."

One aspect of the day of Christ that is not detailed in the scriptures is when it will occur. It could be today or 1000 years from now. Only God knows. It is not possible to learn or estimate (by signs, calendars, CNN, etc.) the day and hour when the Lord's day will begin, as God is keeping it a secret. We only know that it will commence with the shout of the Archangel Gabriel.

I Thessalonians 4:16,17 "For the Lord himself shall descend from heaven with a shout, with the voice of the archangel, and with the trump of God: and the dead in Christ shall rise first: Then we which are alive and remain shall be caught up together with them in the clouds, to meet the Lord in the air: and so shall we ever be with the Lord."