We now have a global economy and many of us routinely work with people on the other side of the planet. Let's just everyone use UTC and be done with it. Each person post the hours they expect to be up or working and other people deal with it(or you mutually work out an agreeable overlap). If a company wants to set up shifts where people in the same or similar timezone are working that is their choice. Some people or night people, some people are morning people and forcing them to work a shift that is not compatible with their biology is both bad for their health and somewhat cruel.
Bottom line, get governments out of the time regulation business and everyone references the same timezone. No more constant browsing to timeanddate.com to figure out if someone is available.