JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="https://code.htmlhifive.com/h5.css">
<script src="https://code.htmlhifive.com/ejs-h5mod.js"></script>
<script src="https://hifive.github.io/hifive-res/fw/current/h5.dev.js"></script>
<script src="https://www.htmlhifive.com/ja/res/lib/jqplugins/jqueryui/jquery-ui-1.9.1.custom.min.js"></script>
<link rel="stylesheet" href="https://www.htmlhifive.com/ja/res/lib/jqplugins/jqueryui/smoothness/jquery-ui-1.9.1.custom.min.css">
<div id="container">
  <input type="text" id="datepicker" value="" />
</div>

JavaScript

/* Japanese initialisation for the jQuery UI date picker plugin. */
/* Written by Kentaro SATO ([email protected]). */
$(function(){
	let data = {
	  closeText: '閉じる',	prevText: '&#x3c;前', nextText: '次&#x3e;',
		currentText: '今日', weekHeader: '週', dateFormat: 'yy/mm/dd',
		firstDay: 0, isRTL: false, showMonthAfterYear: true, yearSuffix: '年',
    monthNames: [], monthNamesShort: [], dayNames: [],
    dayNamesShort: [], dayNamesMin: []
  };
  // 日付の作成（1〜12月）
  for (let i = 1; i <= 12; i++) {
    data.monthNames.push(`${i}月`);
    data.monthNamesShort.push(`${i}月`);
  }
  
  // 曜日の作成（日〜土曜日）
  let weekdays = ['日','月','火','水','木','金','土'];
  for (let index in weekdays) {
  	data.dayNames.push(`${weekdays[index]}曜日`);
    data.dayNamesShort.push(weekdays[index]);
    data.dayNamesMin.push(weekdays[index]);
  }
  
	$.datepicker.regional['ja'] = data;
	$.datepicker.setDefaults($.datepicker.regional['ja']);
  var controller = {

    __name: 'DatepickerController',

    __ready: function() {
      $('#datepicker').datepicker();
    }
  };

  // コントローラの作成と要素へのバインド.
  h5.core.controller('#container', controller);
});