目录前言LocalDateTime获取当前时间获取当前时间的年月日时分秒给LocalDateTime赋值时间与字符串相互转换时间运算：加上对应时间时间运算：减去对应时间两个时间比较利用Duration计算时间差改变当前时间的年月日时分
I am using Qt Builder to create a simple window. I used the menu editor to add a menu. Now, I figured out how to connect one of the menu items to the close() method of the main window. My problem is
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