Haw. Code R. § 18-237D-4-22
In computing any time period under sections 18-237D-4-01 through 18-237D-4-35, the day of the act, event, or default from which the period of time begins to run shall not be included. The last day of the period so computed shall be included, unless it is a Saturday, Sunday, state holiday, or state government furlough day. Intermediate Saturdays, Sundays, legal holidays, or government furlough days shall be included. Intermediate Saturdays, Sundays, state holidays, or state government furlough days shall be excluded in the computation when the period of time prescribed or allowed is less than seven days. Except as otherwise provided, whenever an act required to be performed under these rules may be accomplished by mail, the act shall be deemed to have been performed on the date the items are postmarked. Any reference in sections 18-237D-4-01 through 18-237D-4-35 to the United States mail shall be treated as including a reference to a designated delivery service and any reference to a postmark by the United States Postal Service shall be treated as including a reference to any date recorded or marked by the designated delivery service. As used in this section, "designated delivery service" means any delivery service designated for purposes of section 7502 of the federal Internal Revenue Code.
Haw. Code R. § 18-237D-4-22