Hello. You might want to note that the America/Halifax timezone also applies to Îles-de-la-Madeleine and the Listuguj reserve in Quebec. Officially, this came into effect on January 1, 2007 (Legal Time Act, CQLR c T-5.1), but the legislative debates surrounding that bill say that it is "accommodating the customs and practices" of those regions, which suggests that they have always been in-line with Halifax.