<a href="https://en.wikipedia.org/wiki/Kingdom_of_Great_Britain" id="mwSA" rel="mw:WikiLink" title="Kingdom of Great Britain">Great Britain</a>, along with its <a href="https://en.wikipedia.org/wiki/British_Empire" id="mwSQ" rel="mw:WikiLink" title="British Empire">overseas possessions</a>, <a href="https://en.wikipedia.org/wiki/Adoption_of_the_Gregorian_calendar#Great_Britain_and_its_colonies" id="mwSg" rel="mw:WikiLink" title="Adoption of the Gregorian calendar">adopts the Gregorian calendar</a>.