ES open and close

Hey guys what is considered the significant open/close for ES? The ES futures never technically closes since its open all night, for example is it 930am, or 815, 800, etc? How about for the close 4pm or 415pm?

 

Stick with SPX or pit hours, 930am to 4pm est

 

0930:04:00 since that's the official hours for NYSE and where all the volume is conducted.

The rest is noise to me and I barely bother to chart it.