Haw. Rev. Stat. § 291E-46: Computation of time.

The time in which any act provided in this part is to be done is computed by excluding the first day and including the last, unless the last day is a Saturday, Sunday, or state holiday, and then it also is excluded; provided that if the last day for the mailing of decisions under sections 291E-37(a) and 291E-38(i) is a federal holiday, it also is excluded.