Order date second & Line break

Hello, I have two questions

The first one is that I need to have the seconds in my order date, is there a way to add this, so I have this date’s format : “yyyy_mm_dd hh:mm:ss”

And the second one is that I export my data in .csv format but I need a line break at some point in the middle of my data, how can I do that ?

Thanks in advance