i corrected it for you...
Ok here's how you count a decade for the slow folks..
1990s - the decade was from 1990 to 1999
2000s - the decade is from 2000 - 2009
However the 21st Century Started in 2001 so...once u inserted "21st century" the made the above post wrong.. WHY? well just because 2000 started a new Decade it did not start the new century!.. :smh:
any questions?
Ordinal
The original method of counting years was ordinal, whether 1st year A.D. or regnal 10th year of King Henry VIII. This ordinal numbering is still present in the names of the millennia and centuries, for example 1st Millennium or the 20th century, and sometimes in the names of decades, e.g. 1st decade of the 21st century.
[edit] Cardinal
In recent years, most people have moved to expressing individual years as cardinal numbers, for example 1945 or 1998. The usage 1999th year A.D. is no longer found. This follows scientific usage, for example astronomical year numbering. As a result, some other calendar names have also moved to cardinals, e.g. 1980s is an acceptable name for a particular decade. However, 1600s could be understood as either a decade or a century.
[edit] Ranges
A change from ordinals to cardinals is incomplete and might not ever be completed; the main issues arise from the content of the various year ranges. Similar issues affect the contents of decades and centuries. Those following ordinal year names naturally choose
2001–2010 as the current decade
2001–2100 as the current century
2001–3000 as the current millennium
Those following cardinal year names equally naturally choose
2000–2009 as the current decade
2000–2099 as the current century
2000–2999 as the current millennium