Same-sex marriage: Legal from Mar 1, 2017 to (none).
Finland voted to legalize full marriage for same-sex couples on November 28, 2014, but it went into effect on March 1, 2017. It was the last Nordic sovereign state to approve gay marriage.
Sources: web.archive.org/web/2017030…//yle.fi/uutiset/osasto/news/same-sex_marriage_law_goes_into_effect_in_finland/9486556
yle.fi/uutiset/osasto/news/…