HRS §572B-10
Out-of-state unions treated as civil unions
If you formed a legal union in another state that is not a marriage but is very similar to a Hawaii civil union, Hawaii will treat it as a valid civil union here. This applies as long as the union met Hawaii's eligibility rules, followed the other state's laws, and can be proven with documents.
domestic partnersspouses
The statute, as written — Unions performed in other jurisdictions
A legal union of two persons that is not a marriage under chapter 572, which was validly formed in another jurisdiction, and which is substantially equivalent to a civil union under this chapter, shall be recognized as a valid civil union in this State and shall be treated the same as a civil union entered into in this State regardless of whether it bears the name civil union; provided that the relationship meets the eligibility requirements of this chapter, has been entered into in accordance with the laws of that jurisdiction, and can be documented.
LawTrove is not legal advice. The summary above is a computer-generated restatement — the authoritative text is the official version linked above.