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I’ve just tried to reproduce the behavior you described, but unfortunately I cant. So I don’t think it’s a default behavior. Maybe it would be a good idea if you post a small example where the production date/time in the header is visible.
But if it’s any help to you, here is what I’ve done: I used the following example from the user guide, which looks like this. But even when I call doc.build() without the additional arguments, I get no header at all.
Source:stackexchange.com