Related Dates
Some additional related dates:
| Earth Date & Time
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New Britannian Date
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Full Date (In-Game)
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| Assassination of Lord British in UO Beta (August 9, 1997 @6pm)
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April 7, (-2 P.C.)
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Thursday, April 7, (-2 P.C.) Midnight Waning Gibbous/Waxing Gibbous Moons
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| Ultima Online Released (September 24, 1997)
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| Ultima IX: Ascension Released (November 23, 1999)
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| Ultima Online: Renaissance Released (May 4, 2000)
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| Ultima Online: Third Dawn Released (March 26, 2001)
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| Ultima Online: Lord Blackthorn's Revenge Released (February 24, 2002)
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| Ultima Online: Age of Shadows Released (February 11, 2003)
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| Ultima Online: Samurai Empire Released (November 2, 2004)
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| Ultima Online: Mondain's Legacy Released (August 30, 2005)
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| Ultima Online: Kingdom Reborn Released (August 27, 2007)
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| Ultima Online: Stygian Abyss Released (September 8, 2009)
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| Lord of Ultima Released (April 20, 2010)
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| Ultima Online: The High Seas Released (October 12, 2010)
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| Ultima Forever Released (August 7, 2013)
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| Lord of Ultima Taken offline (May 12, 2014)
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| Ultima Forever Taken offline (August 29, 2014)
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| Ultima Online: Stygian Abyss Released (October 9, 2015)
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Although the timing of the release of Ultima Online is remarkable, and it seems the Cataclysm might have occurred during the shattering of Mondain's Gem of Immortality, which created the various shards in that game, Lord British has stated that this timing is not intentional. The New Britannian calendar is back-calculated from when the developers began working on the game, January 1, 2013.