"Chris Walton" <Chris.Walton@telus.com> writes: Wow, thanks for all those references! You did a lot of legwork. I'll fold them into the "northamerica" comments.
http://www.assnat.qc.ca/eng/37legislature2/Projets-loi/Publics/06-a002.htm
This reference has some extra bits of information that prompted me to fill in one of our long list of TODO items, namely time in far east Quebec. The reference says that Quebec observes EST/EDT if you are west of 63 degrees West longitude, or are in "the territory of Municipalite regionale de comte de Minganie". As I understand it from http://atlas.nrcan.gc.ca/ and Wikipedia, this territory straddles the meridian in question. It also says that Quebec observes AST if you are "east of the meridian of 63 degrees West longitude" or "in the territory of the Listuguj reserve" (which is west of that meridian -- evidently this is an exception to the general EST/EDT rule); and that during summer you observe ADT if you are "in the Iles-de-la-Madeleine" or "in the territory of the Listuguj reserve".
From this we can deduce that if you are in Quebec east of 63 degrees W., and are not in the MRC Miganie, and are not in the Iles-de-la-Madeleine, and are not in the territory of the Listuguj reserve, then you observe AST all year. This matches information we already have from Matthews and Vincent (1998), and I just now confirmed this from a quite detailed web page from the Quebec department of justice <http://www.justice.gouv.qc.ca/english/publications/generale/temps-regl-1-a.h...>.
With all these seemingly authoritative defacto and dejure references, we should have a Zone for this AST-only region. The 2001 Census of Canada lists Blanc-Sablon (pop 1201) as the most populous in this region, so I will propose adding a new zone America/Blanc-Sablon for it. For lack of better historical info I'll suggest something like this: Zone America/Blanc-Sablon -3:48:28 - LMT 1884 -4:00 Canada A%sT 1970 -4:00 - AST Evidently the folks in Listuguj prefer to sync with New Brunswick, and I suspect they can use America/Moncton; similarly the folks in Les Iles-de-la-Madeleine prefer Prince Edward Island or Nova Scotia time and can use America/Halifax.