import React, { useCallback, useState } from 'react';
import DateRangeBox from 'devextreme-react/date-range-box';
const msInDay = 1000 * 60 * 60 * 24;
const now = new Date();
const lastDay = new Date(now.getFullYear(), now.getMonth() + 1, 0).getDate();
const initialValue: [Date, Date] = [
  new Date(now.getTime() - msInDay * 3),
  new Date(now.getTime() + msInDay * 3),
];
const min = new Date(now.setDate(1));
const max = new Date(now.setDate(lastDay));
function convertRangeToDays([startDate, endDate]: [Date, Date]) {
  const diffInDay = Math.floor(Math.abs((endDate.valueOf() - startDate.valueOf()) / msInDay));
  return diffInDay + 1;
}
export default function App() {
  const [selectedDays, setSelectedDays] = useState(convertRangeToDays(initialValue));
  const onCurrentValueChange = useCallback(
    ({ value: [startDate, endDate] }) => {
      let daysCount = 0;
      if (startDate && endDate) {
        daysCount = convertRangeToDays([startDate, endDate]);
      }
      setSelectedDays(daysCount);
    },
    [setSelectedDays],
  );
  return (
    <div className="dx-fieldset">
      <div className="dx-field">
        <div className="dx-field-label multiline-label">
          <span>Default functionality</span>
          <div className="selected-days-wrapper ">
            <span>Days selected: </span>
            <span>{selectedDays}</span>
          </div>
        </div>
        <div className="dx-field-value">
          <DateRangeBox
            defaultValue={initialValue}
            onValueChanged={onCurrentValueChange}
          />
        </div>
      </div>
      <div className="dx-field">
        <div className="dx-field-label">Custom format</div>
        <div className="dx-field-value">
          <DateRangeBox
            defaultValue={initialValue}
            displayFormat="EEEE, MMM dd"
          />
        </div>
      </div>
      <div className="dx-field">
        <div className="dx-field-label">Use buttons to apply selection</div>
        <div className="dx-field-value">
          <DateRangeBox applyValueMode="useButtons" />
        </div>
      </div>
      <div className="dx-field">
        <div className="dx-field-label">Single-calendar view</div>
        <div className="dx-field-value">
          <DateRangeBox multiView={false} />
        </div>
      </div>
      <div className="dx-field">
        <div className="dx-field-label">Calendar only appears on icon click</div>
        <div className="dx-field-value">
          <DateRangeBox openOnFieldClick={false} />
        </div>
      </div>
      <div className="dx-field">
        <div className="dx-field-label">Limit available dates (this month)</div>
        <div className="dx-field-value">
          <DateRangeBox
            min={min}
            max={max}
          />
        </div>
      </div>
      <div className="dx-field">
        <div className="dx-field-label">Disable out of range selection</div>
        <div className="dx-field-value">
          <DateRangeBox disableOutOfRangeSelection={true} />
        </div>
      </div>
      <div className="dx-field">
        <div className="dx-field-label">Clear button</div>
        <div className="dx-field-value">
          <DateRangeBox
            defaultValue={initialValue}
            showClearButton
          />
        </div>
      </div>
    </div>
  );
}
    
    import React, { useCallback, useState } from 'react';
import DateRangeBox from 'devextreme-react/date-range-box';
const msInDay = 1000 * 60 * 60 * 24;
const now = new Date();
const lastDay = new Date(now.getFullYear(), now.getMonth() + 1, 0).getDate();
const initialValue = [new Date(now.getTime() - msInDay * 3), new Date(now.getTime() + msInDay * 3)];
const min = new Date(now.setDate(1));
const max = new Date(now.setDate(lastDay));
function convertRangeToDays([startDate, endDate]) {
  const diffInDay = Math.floor(Math.abs((endDate.valueOf() - startDate.valueOf()) / msInDay));
  return diffInDay + 1;
}
export default function App() {
  const [selectedDays, setSelectedDays] = useState(convertRangeToDays(initialValue));
  const onCurrentValueChange = useCallback(
    ({ value: [startDate, endDate] }) => {
      let daysCount = 0;
      if (startDate && endDate) {
        daysCount = convertRangeToDays([startDate, endDate]);
      }
      setSelectedDays(daysCount);
    },
    [setSelectedDays],
  );
  return (
    <div className="dx-fieldset">
      <div className="dx-field">
        <div className="dx-field-label multiline-label">
          <span>Default functionality</span>
          <div className="selected-days-wrapper ">
            <span>Days selected: </span>
            <span>{selectedDays}</span>
          </div>
        </div>
        <div className="dx-field-value">
          <DateRangeBox
            defaultValue={initialValue}
            onValueChanged={onCurrentValueChange}
          />
        </div>
      </div>
      <div className="dx-field">
        <div className="dx-field-label">Custom format</div>
        <div className="dx-field-value">
          <DateRangeBox
            defaultValue={initialValue}
            displayFormat="EEEE, MMM dd"
          />
        </div>
      </div>
      <div className="dx-field">
        <div className="dx-field-label">Use buttons to apply selection</div>
        <div className="dx-field-value">
          <DateRangeBox applyValueMode="useButtons" />
        </div>
      </div>
      <div className="dx-field">
        <div className="dx-field-label">Single-calendar view</div>
        <div className="dx-field-value">
          <DateRangeBox multiView={false} />
        </div>
      </div>
      <div className="dx-field">
        <div className="dx-field-label">Calendar only appears on icon click</div>
        <div className="dx-field-value">
          <DateRangeBox openOnFieldClick={false} />
        </div>
      </div>
      <div className="dx-field">
        <div className="dx-field-label">Limit available dates (this month)</div>
        <div className="dx-field-value">
          <DateRangeBox
            min={min}
            max={max}
          />
        </div>
      </div>
      <div className="dx-field">
        <div className="dx-field-label">Disable out of range selection</div>
        <div className="dx-field-value">
          <DateRangeBox disableOutOfRangeSelection={true} />
        </div>
      </div>
      <div className="dx-field">
        <div className="dx-field-label">Clear button</div>
        <div className="dx-field-value">
          <DateRangeBox
            defaultValue={initialValue}
            showClearButton
          />
        </div>
      </div>
    </div>
  );
}
    
    import React from 'react';
import ReactDOM from 'react-dom';
import App from './App.tsx';
ReactDOM.render(<App />, document.getElementById('app'));
    
    window.exports = window.exports || {};
window.config = {
  transpiler: 'ts',
  typescriptOptions: {
    module: 'system',
    emitDecoratorMetadata: true,
    experimentalDecorators: true,
    jsx: 'react',
  },
  meta: {
    'react': {
      'esModule': true,
    },
    'typescript': {
      'exports': 'ts',
    },
    'devextreme/time_zone_utils.js': {
      'esModule': true,
    },
    'devextreme/localization.js': {
      'esModule': true,
    },
    'devextreme/viz/palette.js': {
      'esModule': true,
    },
    'openai': {
      'esModule': true,
    },
  },
  paths: {
    'npm:': 'https://cdn.jsdelivr.net/npm/',
    'bundles:': '../../../../bundles/',
    'externals:': '../../../../bundles/externals/',
  },
  defaultExtension: 'js',
  map: {
    'ts': 'npm:plugin-typescript@8.0.0/lib/plugin.js',
    'typescript': 'npm:typescript@4.2.4/lib/typescript.js',
    'jszip': 'npm:jszip@3.10.1/dist/jszip.min.js',
    'react': 'npm:react@17.0.2/umd/react.development.js',
    'react-dom': 'npm:react-dom@17.0.2/umd/react-dom.development.js',
    'prop-types': 'npm:prop-types/prop-types.js',
    'rrule': 'npm:rrule@2.6.4/dist/es5/rrule.js',
    'luxon': 'npm:luxon@3.4.4/build/global/luxon.min.js',
    'es6-object-assign': 'npm:es6-object-assign',
    'devextreme': 'npm:devextreme@link:../../packages/devextreme/artifacts/npm/devextreme/cjs',
    'devextreme-react': 'npm:devextreme-react@link:../../packages/devextreme-react/npm/cjs',
    'devextreme-quill': 'npm:devextreme-quill@1.7.6/dist/dx-quill.min.js',
    'devexpress-diagram': 'npm:devexpress-diagram@2.2.24/dist/dx-diagram.js',
    'devexpress-gantt': 'npm:devexpress-gantt@4.1.64/dist/dx-gantt.js',
    'inferno': 'npm:inferno@8.2.3/dist/inferno.min.js',
    'inferno-compat': 'npm:inferno-compat/dist/inferno-compat.min.js',
    'inferno-create-element': 'npm:inferno-create-element@8.2.3/dist/inferno-create-element.min.js',
    'inferno-dom': 'npm:inferno-dom/dist/inferno-dom.min.js',
    'inferno-hydrate': 'npm:inferno-hydrate/dist/inferno-hydrate.min.js',
    'inferno-clone-vnode': 'npm:inferno-clone-vnode/dist/inferno-clone-vnode.min.js',
    'inferno-create-class': 'npm:inferno-create-class/dist/inferno-create-class.min.js',
    'inferno-extras': 'npm:inferno-extras/dist/inferno-extras.min.js',
    '@preact/signals-core': 'npm:@preact/signals-core@1.8.0/dist/signals-core.min.js',
    'devextreme-cldr-data': 'npm:devextreme-cldr-data@1.0.3',
    // SystemJS plugins
    'plugin-babel': 'npm:systemjs-plugin-babel@0.0.25/plugin-babel.js',
    'systemjs-babel-build': 'npm:systemjs-plugin-babel@0.0.25/systemjs-babel-browser.js',
    // Prettier
    'prettier/standalone': 'npm:prettier@2.8.8/standalone.js',
    'prettier/parser-html': 'npm:prettier@2.8.8/parser-html.js',
  },
  packages: {
    'devextreme': {
      defaultExtension: 'js',
    },
    'devextreme-react': {
      main: 'index.js',
    },
    'devextreme-react/common': {
      main: 'index.js',
    },
    'devextreme/events/utils': {
      main: 'index',
    },
    'devextreme/common/core/events/utils': {
      main: 'index',
    },
    'devextreme/localization/messages': {
      format: 'json',
      defaultExtension: 'json',
    },
    'devextreme/events': {
      main: 'index',
    },
    'es6-object-assign': {
      main: './index.js',
      defaultExtension: 'js',
    },
  },
  packageConfigPaths: [
    'npm:@devextreme/*/package.json',
  ],
  babelOptions: {
    sourceMaps: false,
    stage0: true,
    react: true,
  },
};
System.config(window.config);
// eslint-disable-next-line
const useTgzInCSB = ['openai'];
    
    import React from 'react';
import ReactDOM from 'react-dom';
import App from './App.js';
ReactDOM.render(<App />, document.getElementById('app'));
    
    <!DOCTYPE html>
<html lang="en">
  <head>
    <title>DevExtreme Demo</title>
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=5.0" />
    <link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/25.1.6/css/dx.light.css" />
    <link rel="stylesheet" type="text/css" href="https://maxcdn.bootstrapcdn.com/font-awesome/4.6.3/css/font-awesome.min.css" />
    <link rel="stylesheet" type="text/css" href="styles.css" />
    <script src="https://cdn.jsdelivr.net/npm/core-js@2.6.12/client/shim.min.js"></script>
    <script src="https://cdn.jsdelivr.net/npm/systemjs@0.21.3/dist/system.js"></script>
    <script type="text/javascript" src="config.js"></script>
    <script type="text/javascript">
      System.import("./index.tsx");
    </script>
  </head>
  <body class="dx-viewport">
    <div class="demo-container">
      <div id="app"></div>
    </div>
  </body>
</html>
    
    .demo-container {
  height: 690px;
}
.dx-field {
  padding: 8px;
}
.selected-days-wrapper {
  font-size: 12px;
  opacity: 0.5;
}
.multiline-label {
  padding-top: 0;
}