JSFiddle - React, Tailwind, and code Playground
HTML
<input type="date" id="kaka">
<button class="haha">click</button>
JavaScript
$(".haha").click(function(){
console.log($("#kaka").val())
})
<input type="date" id="kaka">
<button class="haha">click</button>
$(".haha").click(function(){
console.log($("#kaka").val())
})