Uncle Li worked the night shift at 23:00 yesterday and got off work at 6:00 this morning. How many hours did he work?
李叔叔昨天23时上夜班，今天早上6时下班，他工作了多少小时．
<gadget id="calculator">24 - 23</gadget>
<output>1</output>

<gadget id="calculator">1 + 6</gadget>
<output>7</output>

<result>7</result>