First-pass translation, for those who don't read Portuguese:Laercio, three questions:

1) Is it VBA code that places the start date in dd/mm/yyyy? I mean, is the start date being placed in the worksheet by VBA code, or by some other method (such as by hand)? I'm not sure from your description.

2) Is it VBA code that places the end date in mm/dd/yyyy? I think you're saying it is.

3) Is it the same VBA statement in both cases? Surely it isn't.

So what I suspect is happening here is that the VBA statement that's putting the end date in your worksheet is doing it wrong; either it's specifying mm/dd/yyyy, or it isn't specifying the format at all and the default format is wrong. To find out which you'll have to look at that VBA statement, and to fix it you might have to change that VBA statement. So the first thing is to find it and post it here. Do you know how to do that? I can't tell from your first post whether you can find your way around a VBA program.