Australia rang in the New Year with a spectacular fireworks display in Sydney, sending rainbow-coloured showers into the night sky and defying the global terror attacks that cast a pall over 2016.
Around 1.5 million people packed Australia's biggest city to watch as the seven tons of midnight fireworks erupted from Sydney Harbour Bridge, with the extravaganza beamed to television sets and phones across the world.
Two hours later, Japan ushered in 2017 in style, with thousands packing the streets of Tokyo and releasing balloons into the air in celebration of the new year.
South Korea, Russia, Hong Kong, Malaysia, Singapore and Indonesia have also now rung in the New Year with street celebrations and fireworks. Tonga and Samoa in the Polynesian Triangle and Kiribati in the Central Pacific were among the first places in the world to see in 2017.
They entered the New Year at 10am GMT on Saturday, 31 December, celebrating with traditional dancing and flame throwing.Auckland, in New Zealand, followed ringing in the New Year at 11am GMT. Five hundred kilos of fireworks were blasted from the city's Sky Tower in just five minutes with Max Key, the son of former Prime Minister John Key, performing a DJ set.
Danish tennis star Caroline Wozniacki, who is in Auckland, tweeted: 'Wishing everyone a happy and healthy New Year from Auckland! Excited to see what 2017 has in store.'
The last place on earth to observe 2017 will be remote and uninhabited US islands, including Baker Island and Howland Island. Sydney's visual feast paid tribute to some of the international musical legends who died this year, including David Bowie and Prince, with purple rain pouring off the bridge in an early display and firework 'stars' soaring high above the harbour. Bowie lived in Sydney for about 10 years during the 1980s and '90s.
The fireworks launched from barges on the harbor also included a 'Willy Wonka moment' in tribute to the late actor Gene Wilder's most famous role.
2016 has seen repeated bloodshed, most recently a deadly truck attack at a Berlin Christmas market, a similar incident on Bastille Day in France that killed 86 people, and atrocities in Turkey and the Middle East.
But the New South Wales state premier urged 'business as usual' as a larger-than-usual crowd gathered due to the weekend timing and warm weather.
'My encouragement to everyone is to enjoy New Year's Eve... in the knowledge that police are doing everything they can to keep us safe,' Premier Mike Baird said.Around 2,000 extra officers were deployed in Sydney after a man was arrested for allegedly making online threats against the celebrations.
There were a number of other reported threats during the holiday period, in Asia-Pacific and elsewhere.
In Melbourne, police foiled a 'significant' Islamic State-inspired Christmas Day terror plot.
Indonesia said it foiled plans by an IS-linked group for a Christmas-time suicide bombing, and 52 died in the Philippines in bomb attacks blamed on Islamist militants.
Israel on Friday issued a warning of imminent 'terrorist attacks' to tourists and western targets in India.
Despite the terror fears, revellers in Hong Kong and Taipei lined the city streets to watch firework performances.
Shoppers in Japan had earlier filled markets to buy tuna and crabs - seen as expensive items for special feasts - for New Year's Day family gatherings.
This year's feverish countdown to midnight will also last longer than usual - an extra second - as a so-called 'leap second' is introduced to compensate for a slowdown in the Earth's rotation.
When the clock eventually chimes midnight in London, a total of 12,000 fireworks will paint the night sky during the Mayor's showcase display on the banks of the Thames, watched by around 110,000 people.
Some of the stars the world lost in 2016 will be honoured during the 12-minute spectacle, as Bowie, Prince and the Two Ronnies, which included the late Ronnie Corbett, are to feature in the soundtrack.
In Edinburgh, the world-renowned Hogmanay street party will see 80,000 punters flock to the city centre to enjoy music from The Charlatans, while Paolo Nutini fronts a concert in the gardens.
But the New Year enthusiasm is at risk of being dampened in northern England and Wales, as rain is set to sweep across areas including Manchester, Leeds and possibly Cardiff at midnight, the Met Office said.In the States, more than 300,000 visitors are expected to descend on Las Vegas for an extravagant New Year's Eve celebration.
Nightclubs are pulling out all the stops with performances from DJ Calvin Harris, rappers T-Pain and Kendrick Lamar and artists Drake and Bruno Mars. The city's celebrity chefs have crafted elaborate prix fixe menus complete with caviar and champagne toasts.
An eight-minute fireworks show will kick off at the stroke of midnight, with rockets launching from the tops of half a dozen casinos.
Federal officials have ranked the celebration just below the Super Bowl and on par with the festivities in Times Square. FBI and Secret Service agents will work alongside local police departments that are putting all hands on deck for the big night.
Pacific Islanders are the first to enter 2017 - 14 hours before Britain joins in the celebrations
Happy New Year from one of the first places on the planet to see 2017 - an island 2,800 miles east of Sydney, Australia, that was celebrating the next year while many were still asleep.
Despite being about the same longitude as Hawaii (one of the last places to see 2017) Kiribati and the collection of islands and atolls that make up the country chose to be in the Australasian time zone and so sits on that side of the International Date Line.To the north a few hundred miles, almost exactly a day later, Hawaii will celebrate being in 2017 when for the 100,000 population of Kiribati the new year will have well and truly started.In Japan, temple bells will echo at midnight as families gather around noodles and revellers flock to shrines for the biggest holiday in Japan.
In China, residents in Beijing and Shanghai, China's two largest cities, will pass New Year's Eve in a relative state of security lockdown, according to Chinese media reports citing police.
The Bund waterfront in Shanghai will not have any celebrations, authorities announced this week, while the sale, use and transportation of fireworks in central Shanghai will be prohibited altogether.
Large buildings that often display light shows will also stay dark. More than 30 people died two years ago in a deadly stampede on Shanghai's waterfront, where 300,000 people had gathered to watch a planned light show.
Beijing police also said countdowns, lightshows, lotteries and other organized activities will not be held in popular shopping districts such as Sanlitun and Guomao. Beijing police advised citizens to avoid crowded areas, closely watch elderly relatives and children, and be aware of exit routes in venues.
In South Korea, hundreds of thousands of South Koreans ushered in the new year with a massive protest demanding the resignation of disgraced President Park Geun-hye. It was the ninth straight weekend of protests that led to Park's impeachment on December 9 over a corruption scandal.
The evening rally overlapped with Seoul's traditional bell-tolling ceremony at the Bosinkgak pavilion at midnight, which was also expected to be a political statement against Park.
