· Becoming an adult at 18.00 (vs. 17.98) years of age is a vague and somewhat arbitrary threshold. If we define it as "knowing right from wrong" and "knowing that your actions have consequences" in the context of the code of law, then a couple of days are not going to have a considerable impact.
· If the major distinction between being tried as a juvenile or an adult is the severity of the punishment and the amount of lenience applied, then it's telling for the attorney to argue for the former, since it indirectly implies that their client will likely be found culpable. Furthermore, if the defendant is found guilty there is a likelihood that their punishment will not be appropriate for their current age, which may seem unfair to some.
If it were up to me to decide, I would treat them as an adult for the purposes of the trial, but take into account their young age as an extenuating circumstance when sentencing.