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To further clarify the often confusing timeline in Avatar: The Last Airbender, this timeline and other articles date events as years before Sozin's Comet (BSC) and years after Sozin's Comet (ASC). 0 ASC is the year Sozin's Comet arrived to begin The War.

Further notes about the system:
0 ASC began in Winter, but with Spring coming soon. This satisfies both the solar calendar and the Chinese Lunar Calendar. Sozin's Comet arrived at the end of the 8th month (solar or Chinese) of that year, in order to satisfy the "end of Summer" term used by Roku.

Aang emerges from the iceberg in late 99 ASC, during Winter, and the final battles of The War occurred in the 8th month of 100 ASC.

Almost all characters turned their present ages in 99 ASC, as no birthdays except for Yue's have been shown in the series. For example, Katara turned 14 years old in 99 ASC, and is now nearly 15.

The only birthday that is known to have occurred is that of Yue, who turned 16 in early 100 ASC, in late winter.

As we do not know Toph's birthday, Toph could have turned 12 in either 99 ASC or 100 ASC. Therefore, her given year of birth (88 ASC) may be inaccurate.

Dating for some of the events between Aang's awakening at the South Pole and Aang's arrival at the North Pole may be inaccurate, as it is unknown which calendar is being used, solar or Chinese Lunar.

On the second ring of Wan Shi Tong's calendar 16 era names are visible. However, it is unclear how these are used in the dating of the Avatar world. The current era, judging by the date of the eclipse, is the Ri Wu era.

1. Ri Wu
(氜武, "Superior military")
2. Chun Tai
(淳泰, "Honest and exalted")
3. Zhi Yuan
(坧元, "Site of the beginning")
4. Jiong Yu
(烱裕, "Bright abundance")
5. Ri Long
(氜隆, "Bright prosperity")
6. Yi Wen
(溢文, "Overflowing culture")
7. Pei Zhi
(培治. "Cultivate Rule")
8. Kun De
(焜徳, "Shining virtue")
9. Yun Zhen
(氲貞, "Flourishing loyalty")
10. Ru Ming
(渪明, "Immersed in brightness")
11. Yao Ping
(堯平, "Peace of Emperor Yao")
12. Yang Chong
(煬崇, "Burning honor")
13. Fen An
(氛安, "Clouded peace")
14. Zhang Shun
(漳順, "Follow the Zhang River")
15. Yuan Zheng
(垣正, "Righteous government")
16. Zhuo Guang
(焯光 "Clear light")

War Years (0 - 100 ASC)

0 ASC - Year of the Dragon
Avatar Aang is confirmed as Avatar at the age of twelve, four years earlier than normal, because the monks were fearful of a possible war. The monks decided to send Aang to a different air temple to continue his training. Distraught and confused by his destiny, he flees the Air Temples.
August/8th month: Fire Lord Sozin begins his war on the other nations. He uses the power of a comet, later renamed in his honor, to launch a genocidal attack on the Air Nomads in an attempt to kill the Avatar. Most, if not all, of the Air Nomads are killed.
Prince Azulon is born.
c. The city of Taku is destroyed by the Fire Nation.

15 ASC - Year of the Ram
A battle between the Fire Navy and the Northern Water Tribe results in the capture of Fire Navy uniforms.

20 ASC - Year of the Rat
Fire Lord Sozin dies at age 102; Fire Lord Azulon ascends the throne.

35 ASC (approx.) - Year of the Rabbit
Prince Iroh is born to Fire Lord Azulon and Fire Lady Ilah.

40 ASC - Year of the Monkey
c. The Fire Nation begins raids on the Southern Water Tribe, destroying its city, and systematically capturing its Waterbenders.
c. Hama is taken prisoner by the Fire Nation.

56 ASC (approx.) - Year of the Rat
Prince Ozai is born to Fire Lord Azulon and Fire Lady Ilah.

75 ASC - Year of the Ram
Kuei is born to the 51st Earth King.

79 ASC - Year of the Pig
The 51st Earth King dies. Kuei becomes the 52nd Earth King. Because of the new Earth King's youth, Long Feng is appointed Regent of Ba Sing Se, and becomes the Earth King's most trusted advisor. Taking advantage of his position, Long Feng suppresses knowledge of the war and takes complete control of the city.

83 ASC - Year of the Rabbit
Jet of the Earth Kingdom is born.
Prince Zuko is born to Prince Ozai and Princess Ursa.

84 ASC - Year of the Dragon
Princess Yue is born to Chief Arnook of the Northern Water Tribe and his wife. Soon after her birth, Yue is healed by the Moon Spirit, Tui.
Sokka is born to Chief Hakoda and Kya of the Southern Water Tribe.
Suki is born on Kyoshi Island.
Mai of the Fire Nation is born to a nobleman and his wife.

85 ASC - Year of the Snake
Princess Azula is born to Prince Ozai and Princess Ursa.
Katara is born to Chief Hakoda and Kya of the Southern Water Tribe.
Ty Lee and her six identical sisters are born into a noble Fire Nation family.

87 ASC- Year of the Ram or 88 ASC- Year of the Monkey
Toph Bei Fong is born to Lao Bei Fong & Poppy Bei Fong of Gaoling.

c. 94 ASC - Year of the Tiger
Iroh begins his legendary Siege of Ba Sing Se.
The Southern Raiders attack the Southern Water Tribe in an attempt to kill the last Southern waterbender. Chief Hakoda's wife Kya sacrifices herself to save 8-year old Katara, the true last Southern Waterbender.

95 ASC - Year of the Rabbit
Iroh breaks through the Outer Wall of Ba Sing Se
Iroh's son Lu Ten is killed in the siege of Ba Sing Se, causing Iroh to end the Siege at Ba Sing Se after 600 days.
Fire Lord Azulon dies at age 95; Fire Lord Ozai ascends the throne.
Princess Ursa, Ozai's wife, disappears shortly after Azulon's death.

97 ASC - Year of the Snake
Prince Zuko is banished to hunt the Avatar after an Agni Kai with his father.

99 ASC - Year of the Ram
Avatar Aang is awakened from 100 years of suspended animation by Katara.
Prince Zuko finds the Avatar, and begins to hunt him down after his first attempt to apprehend him fails.
Avatar Roku informs Aang on the winter solstice that Sozin's Comet will arrive by summer's end, telling him that Ozai must be defeated by the time of its arrival.
The Fire Sages are accused of treason and imprisoned by Admiral Zhao.

100 ASC - Year of the Monkey
The Fire Nation is repelled at the Battle for the Northern Air Temple, but they acquire an experimental war balloon in the aftermath.
The Fire Nation attacks the Northern Water Tribe, but is repelled by Aang acting as the Avatar of the Ocean Spirit, La, after Admiral Zhao kills the Moon Spirit.
La kills Admiral Zhao in retaliation for Tui's death.
Omashu falls to the Fire Nation.
An attempt to break through Ba Sing Se's Outer Wall, using a giant drill and led by Princess Azula, fails.
Ba Sing Se falls to the Fire Nation through an internal coup d'etat led by Princess Azula and the Dai Li.
High-Security Prisoner General Iroh is imprisoned by Princess Azula and the Dai Li.
Dai Li operative Joo Dee is appointed Supreme Bureaucratic Administrator of Ba Sing Se by Princess Azula.
Prisoner General Iroh is transported to Fire Nation.
The Fire Nation establishes administrative control of the Serpent's Pass by establishing a fortified bridge.

1 August/1st Day of 8th Month: An attack on the Fire Nation Capital led by Avatar Aang in an attempt to defeat the Fire Lord fails, leaving many of the Fire Lord's enemies imprisoned.
During the failed invasion, King Bumi liberates Omashu from the Fire Nation.
Prince Zuko betrays the Fire Nation and joins the Avatar's quest to oust Fire Lord Ozai.
General Iroh breaks free from the Fire Nation Prison.
Zuko and his allies free several prisoners from the Boiling Rock Prison, the first successful escape to take place at this prison.
The Fire Nation attacks the Western Air Temple in an attempt to kill Zuko and Aang. The attack fails as everybody escapes. The group takes refuge on Ember Island.
Fire Lord Ozai crowns himself Phoenix King while he appoints Azula as Fire Lord.
Ozai launches a major attack on the Earth Kingdom with his armada of Fire Nation Airships in an attempt to end the War.
Sozin's Comet returns, enhancing the Firebenders' powers 100-fold.
The Order of the White Lotus, led by General Iroh, frees Ba Sing Se from Fire Nation rule in the Liberation of Ba Sing Se, effectively liberating the entire Earth Kingdom.
An attack launched by Avatar Aang's group succeeds in destroying the Fire Nation Air Force.
Prince Zuko and Katara defeat Azula during her coronation as Fire Lord in the Comet Enhanced Agni Kai. Her defeat causes her to have a total mental breakdown.
Avatar Aang defeats Ozai through the use of the Avatar State, and uses Energybending to strip him of his Firebending.
Phoenix King Ozai is imprisoned for various war crimes.
Prince Zuko ascends to the throne as Fire Lord, vowing to the Nations that he will dedicate his rule to rebuilding the world with the help of the Avatar.