Haw. Rev. Stat. § 88-50.5
Any member of the system who was required to take mandatory maternity leave prior to July 1, 1973, may be credited up to four years of membership service credit for mandatory maternity leave; provided that the maximum credit for each pregnancy shall be limited to twelve months.
A member's maternity leave shall be considered service in the member's occupation at the time the leave was taken and may be credited in accordance with sections 88-59, 88-272, and 88-324.
Any retirant, who returns to employment and is reenrolled as a member of the system and who has at least three years of credited service in the system during the period of reemployment, may be credited with membership service credit for maternity leave as provided in this section.
HRS § 88-50.5