EXCEL: My custom date format

[$-409]ddd dd-mm mmm-yyyy;@

Don’t know what “[$-409]” is?

Don’t know why I need the space in the “mm mmm” string?

Don’t know what the “;@“ is?

Don’t how to “fix” that ugly space in “01JAN”?

SO I demonstrated I don’t know a lot!

# – # – # – # – #  2017-Apr-03 @ 13:00