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The tz database partitions the world into regions where local clocks all show the same time. This map was made by combining version 2023d with OpenStreetMap data, using open source software. [1] This is a list of time zones from release 2025a of the tz database. [2]
All of Newfoundland and southern Labrador, which observes UTC−03:30 as its standard time zone, observed UTC−01:30. [25] This only happened in 1988 and the province now only adjusts its time by one hour for daylight saving time.
Date and time notation in Canada combines conventions from the United Kingdom, conventions from the United States, and conventions from France, often creating confusion. [1] The Government of Canada specifies the ISO 8601 format for all-numeric dates ( YYYY - MM - DD ; for example, 2025-02-01). [ 2 ]
Such designations can be ambiguous; for example, "CST" can mean China Standard Time (UTC+08:00), Cuba Standard Time (UTC−05:00), and (North American) Central Standard Time (UTC−06:00), and it is also a widely used variant of ACST (Australian Central Standard Time, UTC+9:30). Such designations predate both ISO 8601 and the internet era; in ...
Port Arthur, Ontario (now part of Thunder Bay), was the first municipality in the world to enact daylight saving time, on July 1, 1908. [4] [5] (Germany later became the first country to adopt the time change, on April 30, 1916.) [6]
During part of the year, some portions of the zone observe daylight saving time, referred to as Atlantic Daylight Time (ADT), by moving their clocks forward one hour to UTC−03:00. The clock time in this zone is based on the mean solar time of the 60th meridian west of the Greenwich Observatory .
English: Time zone map of Canada with English labels This map depicts observed time zones and observed time zone boundaries, some of which differ from those defined by provincial and territorial legislation. In areas with no road network and no inhabitants, the map falls back to using legislated time zone boundaries.
The military time zone system ensures clear communication in a concise manner, and avoids confusion when coordinating across time zones. The CCEB , representing the armed forces of Australia, Canada, New Zealand, the United Kingdom, and the United States, publishes the military time zone system as the ACP 121 standard. [ 1 ]