Why is timezone: in config in one example and in the other its under module?

I have been trying to change the timezone on the clock module for days. I don’t understand why when I add the config lines it bricks MM. Can someone help me out?

 module: "clock",
        position: "top_left",   // This can be any of the regions.
        config: {
             timezone: 'America/New_York'
}