2001 ; see related link below .
Wikipedia "went online" in 2001 however it does not operate under "normal" copyright restrictions. Wikipedia uses a Creative Commons Attribution-ShareAlike 3.0 Unported License to control it's intellectual property.
See the related link below for a copy of the agreement and how it operates
2010 If you scroll to the bottom of any website if it is copyrighted it wall say copyrighted (the copyright sign) then the year it was copyrighted
In addition, one needs to be aware of the fact that the year at the bottom of web pages gets updated as time goes on. This means that if it says "Copyright 2010", the owner of the page has probably updated the copyright information to reflect that copyright is still possessed/maintained at current time, however , it does not mean that the page was originally formed/authored in 2010. Copyright can go back many years and you can't tell that information from the copyright notice at the bottom.
According to their own website, Wikipedia was created in January of 2001.
Dynamic websites such as Wikipedia give their publication or copyright date as the date the page was generated on the user's screen, so the year shown will always be the current year.
Wikipedia started as Nupedia in 2000. It became Wikipedia on January 15, 2001.
January 15, 2001 was the date that Wikipedia was founded.
It was launched on January 15, 2001
Tamil Wikipedia was created in 2003.
Urdu Wikipedia was created in 2004.
Afrikaans Wikipedia was created in 2001.
Spanish Wikipedia was created in 2001.
Swedish Wikipedia was created in 2001.
Lithuanian Wikipedia was created in 2003.
Tagalog Wikipedia was created in 2003.
Japanese Wikipedia was created in 2001.
Thai Wikipedia was created in 2003.
Greek Wikipedia was created in 2002.
Croatian Wikipedia was created in 2003.
Telugu Wikipedia was created in 2003.