'_' (underscore) in Basic Format() function?

[fpy]

any idea where the documentation is for the behaviour of ‘_’ :

Sub WhereIsTheDocForThis
  msgbox format( now(), "yyyy_mm_dd") & " // " & format( now(), "yyyy\_mm\_dd")

End Sub

couldn’t find anything from Format Function

[mikekaganski]

Scroll down to the bottom of the Format function help page, and click on Number format codes link. Check the Spaces section there.