how to get "0000" + 1 = 0001 ?

[André Bisseret]

Bonjour,

When I add 1 to 0000, I am getting 1
How to get 0001 instead

I read the dictionary
at "numberFormat" or at "format" (function)

but I am unable to get the right syntax :-((

Thank a lot for any help

Best regards from Grenoble

André