Here are two time frames from the churches of Revelation, "hour of trial" and "tribulation ten days".  Are these two times before the tribulation(7 years), or after it starts?  Are they the same event or different ones?  My thought is maybe the "hour of trial" could be ascension day and the "tribulation ten days" would be the ten days to Pentecost.  Any thoughts?

church in Philadelphia
Rev 3:10 Because you have kept My command to persevere, I also will keep you from the hour of trial which shall come upon the whole world, to test those who dwell on the earth.

church in Smyrna
Rev 2:10 Do not fear any of those things which you are about to suffer. Indeed, the devil is about to throw some of you into prison, that you may be tested, and you will have tribulation ten days. Be faithful until death, and I will give you the crown of life.