Depending on the date of Installation, a lodge year may coincide with a calendar year or be portions of two calendar years;
Doric Lodge: From 1880 to 1919, the installation was held in June and a year of service is shown below as "1882/83".
In 1920, the installation was moved from June to January 1921. From that date onward, a year of service is shown as "1921".
Ancient Landmarks and Landmarks/Doric: Since its inauguration and until 1996, Ancient Landmarks held its installation in January and a year of service is shown as "1932". In 1997, the installation date was moved from January to May From that date onward, a year of service is shown as "1997/98". Landmarks/Doric has continued with the May installation date.