Is there any plan to create this format as a constant? Otherwise, we will have to devise a pattern to define this format globally. I’d like to avoid doing this.
To see if there’s a plan to change this, look for open issues at https://github.com/golang/go/issues - if there is none, assume there is no plan.
I can agree that this looks like an odd oversight.
That said, if you’re producing the data yourself you can lock down the format yourself. You can probably also assume that the default Go format string isn’t going to change.