因为uni-datetime-picker组件源码中input标签盖住了图标，修改源码样式即可。

.uni-date-editor--x {
position: relative;
display: flex;
flex-direction: row;
}

.uni-date-editor--x .uni-date__icon-clear {
display: inline-block;
box-sizing: border-box;
border: 9px solid transparent;
/ #ifdef H5 /
cursor: pointer;
/ #endif /
}