What is the purpose in changing to Meridian Mecca Time - the next Universal Time standard?

Saudi Arabia hopes the four faces of the new clock, which will loom over Mecca's Grand Mosque from what is expected to be the world's second tallest building, will establish Mecca as an alternate time standard to the Greenwich median. The clock reflects a goal by some Muslims to replace the 126-year-old Universal Time standard -- originally called Greenwich Mean Time (GMT) -- with Mecca mean time.