T-5.1 - Legal Time Act

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2. In the part of Québec lying east of the meridian of 63 degrees West longitude, and in the territory of the Listuguj reserve, the legal time is Atlantic Standard Time, that is, four hours behind coordinated universal time (UTC − 4 h).
However, from the second Sunday in March at 2:00 a.m. to the first Sunday in November at 2:00 a.m., the legal time in the Îles-de-la-Madeleine and in the territory of the Listuguj reserve is Atlantic Daylight Saving Time, that is, three hours behind coordinated universal time (UTC − 3 h).
2006, c. 39, s. 2.