The Communist Party of China was born on July 1, 1921, and July 1, 2011 happened to be the anniversary of the founding of the party.
中国共产党是1921年7月1日诞生的，2011年7月1日正好是建党多少周年．
<gadget id="calculator">2_011 - 1_921</gadget>
<output>90</output>

<result>90</result>