The first phase of Jianxin Road Widening Project in Cangnan County started on April 1 and is expected to end on July 21. How many days will it take?
苍南县建新路拓宽工程第一期工程4月1日开始，预计7月21日结束，历时多少天．
<gadget id="calculator">30 + 31 + 30 + 21</gadget>
<output>112</output>

<result>112</result>