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Thus, in practice, Portuguese standard time was defined as the mean solar time at Lisbon Observatory longitude, which was later calculated as being GMT–00:36:45. [3] In 1911, it was agreed that standard time in Portugal should be defined in accordance with the 1884 prime meridian system. [4]
By the end of 19th century, the time standard provided by the observatory had been switched to GMT+08:00. [3] The practice has spread to other coastal ports, and in 1902 the "Coastal Time" was proposed to be the universal time zone for all the coastal ports in China. However, the time zone for the rest of China remained undetermined.
Pale colours: Standard time observed all year Dark colours: Summer time observed In Turkey, time is given by UTC+03:00 year-round. This time is also called Turkey Time (TRT).
In the United States and Canada, the Mountain Time Zone is to the east of the Pacific Time Zone and to the west of the Central Time Zone. In some areas, starting in 2007, the local time changes from MST to MDT at 2 am MST to 3 am MDT on the second Sunday in March and returns at 2 am MDT to 1 am MST on the first Sunday in November.
The clocks were set ahead of GMT by 8 hours in Western Australia; by 9 hours in South Australia (and the Northern Territory, which it governed); and by 10 hours in Queensland, New South Wales, Victoria, and Tasmania. The three time zones became known as Western Standard Time, Central Standard Time, and Eastern Standard Time.
The Pacific Time Zone (PT) is a time zone encompassing parts of western Canada, the western United States, and western Mexico. Places in this zone observe standard time by subtracting eight hours from Coordinated Universal Time (UTC−08:00).