Best way to establish "Times of Day" for a worldwide audience?

[cjpopp]

Here's a neat little logic puzzle for everyone that I am trying to figure out.

In addition to web designing, I also own an Internet Radio station. We get a lot of listeners from around the world.

So, when I started to design a listener survey form, I asked "When do you listen to 9412?" and the choices were Morning, Afternoon, Evening, Late Night.

The problem? Morning here in Central Time (US) is evening in Japan.

So I thought I would use GMT to establish times.. 0000 - 0600 GMT, 0600 - 1200 GMT and so on.

Problem is not everyone knows what GMT is.

So, how would YOU clarify those choices? Keep in mind that you can't say CT only because not everyone knows what CT is.

 

[commes]

woah, that sounds confusing to me.not many people havent heard of GMT unless there like under 9