There is something I have thought about in the past, and still think it's possible, that a "Pre-Trib Rapture" could very well be the timing. This is my opinion as to a possible time frame, but please keep in mind, this is just my thoughts on it.
To have a "One World Government", the whole world, every country in the world will have to be in agreement that it would be best to have a One World Government. If just one country would disagree, then it would be hard for this to happen.
Now, what is the best way for every country to come together for a One World Government? What is the best circumstances for someone, one person, to stand up to take control? Something "terrible" has to happen. What could that one thing be that could happen that would cause every country to "want" to get under one government? The disappearance of millions of people, and children.
After the Rapture, the world will be in chaos. There will be deaths caused by the rapture, many deaths. Many suicides. People will be confused not know what to do, what to think. What better circumstances would come for someone to "rise up" and take control, to bring a sense of normality back?
"IF" this is true, this could very well be the time when the anti-Christ rises, bringing a One World Government, and a One World Religion.
This is just something I wanted to throw out there, not to be believed, or to say it "will" happen in this way. But as for the timing of the Rapture and the One World Government, to me, it makes sense.