It's all very simple.
Just wait until the tribulation begins, and then start counting the days.
If you are mid-trib, you will know what day the rapture is.
If you are post-trib, you will know what day the rapture is.
But pre-trib?
1 Thessalonians 5:2;
"...for you know very well that the day of the Lord will come like a thief in the night".
So now you are setting dates? The day of the Lord comes like a thief in the night to those who have not prepared themselves to be the Bride of Christ He returns for. God gives us signs to watch for, but not the very time of His return as Jesus desn't even know until God sends Him.
Mat 24:36 But of that day and hour knoweth no man, no, not the angels of heaven, but my Father only.
Mat 24:37 But as the days of Noe were, so shall also the coming of the Son of man be.