It is really interesting to think about this, but I really don't see a solution on how to determine the division of the daytime worldwide during, what would be the 'office hours'. I wouldn't mind to start my day in the very early morning and stop working at what is now noon, so that my evening is the current afternoon. But at the same time, my antipodes will sleep till somewhere before noon, start working in de middle of the afternoon, finish working at midnight and spend there evening in what is now there night. Somebody in the world will have to spend their days like that, and I don't think there are many volunteers in the world.
Maybe, rotating the 'office' hours with eg 1 hour per month would be a solution ?