Sorry for short answer, Im working and coffee break was over,
The way I see it the church is pre raptured, when the tribulation begins God still needs a light in the darkness for people to see a way to God, For instance two lampstands will shine in the darkness. But the world will still be in the night.
As for the Day of the Lord passages, when it speaks about the Day of Jehovah or the day of the Lord its a reference to the tribulation period, when it speaks the about the day without the Lords name, it can either be about the tribulation or the Millennium, The Zechariah passage you quoted to me the context is more about the setting up of the millennial kingdom, The Lord has in previous verses touched down on the mount of olives in the second coming, formed a huge valley that greatly alters the geography of the area, and gives Israel access into or allows them to inhabit Jerusalem, reminiscent of going through the red sea or the Jordan, so I agree there is light but its at the end of the tribulation in this reference in my humble opinion. Sort of the night is darkest just before the dawnthoughts come to mind.
Of course this shows the survivors are not raptured so people are sure to disagree with me, but I haven't got a clue to what position you hold if you hold one, maybe mid trib rapture???