![]() Where the longitudes are in different directions (one East and one West) add the values together. ![]() Where the longitudes are in the same direction, use the difference in values. Other countries, such as India and China, have a single time zone for the entire country despite the fact that the extent of their borders exceeds 15 degrees of longitude.Ĭalculating journey times incorporates the time taken for the journey based on given local times plus a time factor allowing for the difference in longitudes. It is observed as ACST during standard time and as ACDST during DST. ACST is offset at 9 hours and 30 minutes ahead of UTC (UTC+09:30). However, a number of countries, including Australia (for South Australia and the Northern Territory), have time zones offset by half-hours or quarter-hours to better suit local noon time. Australian Central Standard Time or Central Standard Time is a half-hour time zone, meaning that the local time differs by half an hour rather than the usual whole hour. Standard time zones based on hourly differences were running in most countries by 1930, but it took until 1986 for all countries to set their time zones with reference to GMT. New Zealand, at the time a British colony, was the first country to adopt a standard referenced time (New Zealand Mean Time) in 1868 when it set its clocks to 11 hours and 30 minutes ahead of GMT. The English railway companies were the first to adopt a standard time in the 1840's, based on GMT and managed with portable chronometers, but GMT did not become the standard time for the whole of England until 1880. These differences became a problem when railway networks were built across the country. This was at a time when every town and city in England kept its own time, based on the local noon. Greenwich Mean Time (GMT) was established at the Royal Observatory at Greenwich (just outside of London) in 1675 to assist mariners in calculating their longitude at sea. Australia is divided into three separate time zones: Australian Eastern Standard Time (AEST) covers the eastern states of Queensland, New South Wales. Current local time and weather in Australia Time Zone: AEST Daylight Saving Time in Australia - Time Change Largest cities in Australia Popular city time. This means that, technically, as you travel around the earth, each 15 degrees of longitude difference in the location of places means that they should have a time difference of one hour. The earth spins through 360 degrees in 24 hours, meaning that in one hour the earth spins through $$15 degrees.
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