ADD 10,000
The year 1989 becomes 11989, the year 44 BC, when Julius Ceasar was murdered, would become 9957 (10001 - 44), 752 BC, the year that Rome was founded, would become 9248, etc.
All years with historical events would have a positive number.

Is there anything significant that happened in year 1 of this new calendar? Roundabout that time the last ice age was ending, agriculture was invented in the Middle East, people reached the southern tip of South America, meaning that all continents had by then been colonized.

Holocene calendar.?conceived by the late Cesare Emiliani, a brilliant geologist in the early 90s.

rather call it the Human Era calendar, not sure who called it that first. I like it as it covers the period when humans started to reach their full potential, for good and for worse,

Isn't it impressive to realize we are living in the year 12003, in the thirteenth millennium, isn't it!


A HUMAN ERA TIMELINE
HE Millennium HE Date Gregorian Date
BC or AD
Event
Thirteenth 12003 2003 AD War in Iraq
12001 2001 AD First year of the 13th millennium
Terrorist attack on the Twin Towers: 3000 people killed
War in Afghanistan
Twelfth 12000 2000 AD Final year of the 12th millennium
11953 1953 AD Watson & Crick announce DNA structure
11945 1945 AD End of Second World War
11944 1944 AD Ralph Born a Week Before D-Day, The Allied Invasion of Normandy France
11939 1939 AD Begin of Second World War
11918 1918 AD End of First World War
11914 1914 AD Begin of First World War
11859 1859 AD Darwin publishes Origin of Species
11649 1649 AD England's Charles I beheaded
11582 1582 AD Gregory XIII proclaims current calendar
11492 1492 AD Taino indians discover Columbus standing on their beach
11456 1456 AD Gutenberg press heralds birth of advertising
11453 1453 AD Fall of Constantinople: end of Eastern Roman Empire
11215 1215 AD John I of England signs Magna Carta
11066 1066 AD William I at Hastings establishes Norman rule in England
Eleventh
11000 1000 AD Norse explorers reach North America
10622 622 AD Mohammed journeys to Medina -- Islamic year 1
10476 476 AD "Fall" of the Western Roman Empire
10455 455 AD Vandals sack Rome
10410 410 AD Visigoths sack Rome
10380 380 AD Theodosius demands adherence to Nicene Creed
10330 330 AD Formal split of East and West Roman Empire
10250 250 AD Rise of Mayan civilization (ultimately peaks about 10900 HE)
10079 79 ADEruption of Vesuvius destroys Pompeii, Herculeneum
10070 70 AD Roman destruction of Jerusalem
10001 1 AD Synchronization with Gregorian date
Tenth 9993 8 BC Probable birth of Jesus of Nazareth
9956 44 BC Julius Caesar assassinated
9955 45 BC Sosigenes establishes Julian calendar
9669 331 BC Alexander the Great conquers Palestine
9645 355 BC Birth of Alexander of Macedonia
9614 386 BC Founding of Plato's academy
9600 400 BC Approximate lifetime of Guatama Buddha
9450 550 BC Birth of Confucius
9248 752 BC Founding of Rome
Ninth 8850 1150 BC Olmec civilization in Mesoamerica
8450 1550 BC Height of Minoan civilization
8400 1600 BC China -- Shang Dynasty
8350 1650 BC Aegean -- Thera volcanic eruption =revised date, please review The Thera (Santorini) Volcanic Eruption and the Absolute Chronology of the Aegean Bronze Age
8251 1749 BC Hammurabi establishes Babylonian Empire
Eight 8000 2000 BC Greece -- Minoan palatial culture
China -- Xia, first state
Southeast Asia -- metal working
Pecos River -- rock art
7650 2350 BC Sumer conquered by Sargon I
7500 2500 BC Mesopotamia -- Akkadian Empire, nation state
Seventh 7000 3000 BC Sumer -- established civilization
Mediterranean -- small established towns
6900 3100 BC Egypt -- unification & First Dynasty under Menes
Egyptian colony in southern Israel
6700 3300 B Austrian Alps -- death and mummification of Oetzi the "iceman"
6600 3400 BC Mesopotamia -- proto-writing
Egypt -- cultural development
6500 3500 BC Mesopotamia -- Uruk and Jemdet Nasr
6400 3600 BC Americas -- definite cultivation of maize
Sixth 6000 4000 BC Seas rise to present-day levels, North Sea now completely filled up
Extinction of Pigmy Mammoths
India -- agriculture
Americas -- millet
Europe -- copper, farming
5997 4004 BCUsher's estimate for the date god created the universe
5500 4500 BC Zimbabwe -- Nachikufan industry
5400 4600 BC North America -- Mazama eruption
5288 4712 BC Beginning of Scalinger's Julian Period, the 7,980-year cycle by which astronomers reckon dates
Fifth 5000 5000 BC Sumer -- Ubiad I culture
China -- Laquer ware, rice
4600 5600 BC Sudden flooding of the Black Sea basin
Fourth 4000 6000 BC Land bridge between Britain and Holland breached
North America -- Bitterroot culture in Idaho
Europe -- Maglemose cultures (mesolithic)
Korea -- Chulmun hunter-gatherers
3400 7600 BC Mureybet, Syria -- domesticated einkorn
Third 3000 7000 BC Indus Valley -- First Mehrgarh Period, includes wheat, barley, sheep & goats, along with hunted gazelle
Second 2000 8000 BC North America -- Folsom points
South America -- domestication of squash
First 1000 9000 BC North America -- clovis points
Abu Hureyra -- established farming
800 9200 BC Brazil -- Amazon cave containing human artifacts
500 9500 BC Japan -- earliest Jomon pottery
1 10000 BC Current interglacial begins (well, maybe 1200 years later, actually!)
Natufian proto-agricultural groups probably in existence by this date
Afghanistan--Hindu Kush, possible domestication of sheep and goats