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Montreal timezone information

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Current time information for Montreal / Quebec / North America

Nevertheless, most major countries had adopted hourly time zones by 1929.
Today, all nations, within Quebec, use standard time zones for secular purposes, but they do not all apply the concept as originally conceived
Newfoundland, India, Iran, Afghanistan, Venezuela, Burma, the Marquesas, as well as parts of Australia use half-hour deviations from standard time, and some nations, such as Nepal, and some provinces, such as the Chatham Islands, use quarter-hour deviations
Some countries, most notably China and India, use a single time zone, even though the extent of their territory far exceeds 15° of longitude
Before 1949 China used five time zones (see Time in China).
Nautical time zones Montreal
Since the 1920s a nautical standard time system has been in operation for ships on the high seas
Nautical time zones are an ideal form of the terrestrial time zone system
Under the system, a time change of one hour is required for each change of longitude by 15°
The 15° gore that is offset from GMT or UT1 (not UTC) by twelve hours is bisected by the nautical date line into two 7.5° gores that differ from GMT by ±12 hours
A nautical date line is implied but not explicitly drawn on time zone maps
It follows the 180th meridian except where it is interrupted by territorial waters adjacent to land, forming gaps: it is a pole-to-pole dashed line.
A ship within the territorial waters of any nation would use that nation's standard time, but would revert to nautical standard time upon leaving its territorial waters
The captain was permitted to change the ship's clocks at a time of the captain’s choice following the ship's entry into another time zone
The captain often chooses midnight.
Skewing of zones; ideal time zones, such as nautical time zones, are based on the mean solar time of a particular meridian located in the middle of that zone with boundaries located 7.5 degrees east and west of the meridian
In practice, zone boundaries are often drawn much farther to the west with often irregular boundaries, and some locations base their time on meridians located far to the east.
For example, even though the Prime Meridian (0°) passes through Spain and France, they use the mean solar time of 15 degrees east (Central European Time) rather than 0 degrees (Greenwich Mean Time)
France previously used GMT, but was switched to CET (Central European Time) during the German occupation of the country during World War II and did not switch back after the war.
There is a tendency to draw time zone boundaries far to the west of their meridians