Earlier quoted context omitted.
https://en.wikipedia.org/wiki/Same-sex_marriage#Timeline 2001 — Netherlands 2001 — Belgium 2005 — Spain, Canada 2006 — South Africa 2009 — Norway, Sweden 2010 — Portugal, Iceland, Argentina 2012 — Denmark 2013 — France, Brazil, Uruguay, New Zealand 2014 — England and Wales 2015 — Luxembourg, Ireland, United States of America 2017 — Finland (the law is voted and signed but not yet in effect) > I mean, Massachusetts le…
Note that those dates are somewhat oversimplifying things. For example, in Sweden there was something called "same-sex partnerships" from 1995 which legally was equivalent to marriage.
You're right that just listing the dates for same-sex marriage doesn't tell the whole picture, but adding civil partnerships and their details would necessarily expand the comment to something closer to a book.
[0] for instance in France civil unions are quite literally a marriage lite, open to all and very commonly used as a legally recognised engagement by heterosexual couples (>90% of civil unions are heterosexual)