Before the world had time zones every time SETI used their own local time which was based on the Sun ie the Sun was at this highest point at 12:00 noon this is known as solar time unless it was worth fame when the best means of transportation was somewhat limited but the advancement of technology was problematic. The United Kingdom was the first country to adopt a standard time zone by using the mean solar time at the Royal Observatory in Greenwich, England, which was known as Greenwich Mean Time.
The United States soon followed by adopting four different time zones. the US. also based their time zones from the Royal Observatory and were five six seven and eight hours behind. Then in 1884 an international conference between 26 nations decided the Royal Observatory in Greenwich would be used as the Prima reading of the world Marking zero degrees longitude. So because they’re 24 hours in a day, 24 lines of longitude, every 15 degrees, mark the center of each time zone. Although it’s actually 25 time zones, -12 to +12 and including 0. Therefore -12 and +12 are half the size of all the other time zones.
Today, every country in the world has one or more time zones and used coordinated Universal Time or UTC which is an offset of the Prime Meridian. But these lines of longitude only mark the ideal time zones, but every country in the world can choose its own time zone and is under no obligation to follow which time zones it actually falls into, because of this there are several strange or complex time zones throughout the world. Take china for example the third largest country in the world which should ideally have 5 different time zones but it doesn’t. The whole of China uses the same time zone Beijing time, which is UTC +8, causes an unfortunate situation for people living in western China, which should ideally be using UTC +5 or 6 because sunrise can be as late as 10:17 a.m. and solar noon can be as late in the day as 3:10 p.m.
Because of this, people living in western China either unofficially use UTC +6 or they do use Beijing time but adjust their day accordingly, by working from 11-7 instead of 9-5. For example, this big difference between a special thing on solar time in western China means that crossing to Afghanistan would result in a clock change of 3 and a half hours because, Afghanistan uses UTC +4:30. This is the biggest thing that doesn’t change by crossing an international border.
Now you may be surprised by Afghanistan’s time zone +4:30. I was surprised to learn that not all countries have time zones are to the neatest hour. While the vast majority are there are six countries that use a standard time zone to the nearest half hour: Venezuela, Iran, Afghanistan, India, Sri Lanka and Burma. Then there’s also Newfoundland, Canada as well as part of French Polynesia. And then there’s Australia, the absolute mother of half our time zones.
Australia has eight official time zones, and each of them is offset to the nearest half hour. Now the mainland Australia only has three time zones. The West Coast uses +8 while the East Coast uses +10, so you can probably guess what the middle time zone is… nope, it’s UTC +9:30. The other three half hour time zones are on the outlying islands, but if you thought half hour time zones were weird, it gets even weirder because there’s one country that uses a time zones to the neatest quarter hour too cool for a regular time zone or a quadrilateral flag.
It’s Nepal, which uses attained zone of UTC +5:45, although it’s not the only place in the world to have a time zone offset by 45 minutes from hour. Chatham Islands of New Zealand, uses +12:45 while the main island use +12. There’s also one unofficial time zones on to the very east of western Australia, +8:45, which is only used by about 200 people. But there’s one more reason why Australia is awkward when it comes to time zones: daylight saving time.
See, while parts of Australia do use DST other parts donot. So those three main landing zones in the winter become five time zones in the summer there’s also Lord Howe Island which uses plus ten and a half and does observe DST but only advances it’s caused by half an hour using plus eleven in the summer this makes Lord have island the only place in the world not to advance by a whole hour during daylight saving pain but by far the weirdest place when it comes to Taine’s owns as the International Dateline now in a perfect world the lane would be at 180 degrees longitude. Exactly opposite the Prime Meridian. But since all countries can choose their own time zones the International Date line is far from a straight line. While you would expect time zones to range from -12 to +12 the furthest advanced time zone is actually +14 which is unique to the lane islands of Kiribati but your honourable same longitude as Hawaii. Both are at the exact same time but Hawaii is an entire calendar day behind. Taking a closer look at the International date line shows just help complex the time zones are. The line islands are 26 hours ahead of the uninhabited u.s. territory Baker Island a bit 2,000 kilometers west of the Lane Islands. Although UTC -12 is an unofficial time zone and all Islands within this time zone are uninhabited. The furthest behind time zones on actually in use as UTC -11 used by the country of Niue as well as several American territories, This 25 hour time difference between Kiribati and Niue means that everyday briefly there are three calendar days and use at the same time. At 10:30 a.m. on Wednesday in the UK is 11:30 p.m. on Tuesday in Niue and 12:30 a.m. on Thursday on the line islands of kiribati. but the International Dateline wasn’t always like this.
Kiribati is made up of three island groups the Gulliver Islands, the Phoenix islands and the lane Islands. The Gilbert Islands were a British colony what the Phoenix and Lane Islands were part of the United States. Then in 1979 kiribati gained independence from the UK and the US relinquished all claims the Phoenix and Line islands which became part of the Republic of Kiribati. The time zones were +12, -11 and -10. This became problematic because offices on different sides of the International Dateline could only conduct business with each other on four days a week when both sides of the Dateline were on a weekday. So in 1995 their time zones were changed by shifting Eastern islands to +13 and +14 drastically changing the shape of the International date line. This also made Kiribati the first country in the world to enter the new millennium. However this wasn’t the most recent change to The International Dateline. The most recent change was in 2011, with Samoa switching sides. Originally, the Samoan Islands were west of the International Dateline, but in 1892, Samoan king was convinced by American traders to switch to east of the International Dateline to –11, just three hours behind California. They agree in order to improve trade with the United States, and the switch was made by repeating the fourth of July 1892. After more than a hundred years, in 2011, the never-independent country of small comprises the Western Samoan Islands, which switched back to west of the International Dateline, while the eastern Samoan Islands American Samoa stayed at mainly eleven; this is because the country’s biggest trading partners are narrow. Australia and New Zealand, so with Spain only being about 70 kilometers between Samoa and American Smart, there’s a 24-hour cane deference of 25 in the summer since some more false daylight saving time while Americans more doesn’t the New Zealand territory have totally followed and also switched sites at the same time.
And finally once slightly odd country went come to time zones at Russia. Russia has main different time zones yet they all seem to be in the wrong place this is because Russia used to have 11 time zones but switched to name in 2010 and then in the summer of 2011 Russia advanced their clocks forward for daylight saving time and just decided not to switch back again using pyramid daylight saving time since Russia is so far north permanent DST gives Russia more sunlight during evenings.