ant-design/components/date-picker/locale/zh_CN.tsx

import GregorianCalendarLocale from 'gregorian-calendar/lib/locale/zh_CN';
import CalendarLocale from 'rc-calendar/lib/locale/zh_CN';
import TimePickerLocale from '../../time-picker/locale/zh_CN';
import assign from 'object-assign';
// 统一合并为完整的 Locale
const locale = assign({}, GregorianCalendarLocale);
locale.lang = assign({
  placeholder: '请选择日期',
  rangePlaceholder: ['开始日期', '结束日期'],
}, CalendarLocale);

locale.timePickerLocale = assign({}, TimePickerLocale);

// should add whitespace between char in Button
locale.lang.ok = '确 定';

// All settings at:
// https://github.com/ant-design/ant-design/issues/424

export default locale;