Xiao Ming's father went on a business trip from February 21 to March 2 this year. How many days did Xiao Ming's father go on business?
小明的爸爸今年2月21日到3月2日到外地出差，小明的爸爸出差了多少天．
<gadget id="calculator">28 - 21</gadget>
<output>7</output>

<gadget id="calculator">7 + 1</gadget>
<output>8</output>

<gadget id="calculator">8 + 2</gadget>
<output>10</output>

<result>10</result>