Under current law, GS 115C-84.2(d) sets the parameters within which local boards of education must determine the opening and closing dates of public schools under subdivision (a)(1) of this statute. Amends GS 115C-84.2(d) to provide the specified local board of education with additional flexibility in adopting its school calendar. Limits application of this provision to Johnston County Schools. Applies beginning with the 2017-18 school year.