By July 1st of this year (2011), the Communist Party of China has celebrated its 90th anniversary. Do the math, how many years should the Communist Party of China be founded on July 1st?
到今年(2011年)的7月1日，中国共产党已成立90周年，算一算，中国共产党建党的日子应该是多少年7月1日．
<gadget id="calculator">2_011 - 90</gadget>
<output>1_921</output>

<result>1_921</result>