If it is true and this Pentecost is the rapture, we will probably have a 40 day and a 7 day warning! That means a 7 day warning would be right about May 27th...and the 40 day warning would be right around April 23rd or thereabouts....depending whether you figure inclusive or not.
 
Perhaps there is a "witness in the stars" to this, though even without one, we'd have to agree that God has given this world plenty of warning "signals" in the past few years!
 
Rene