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

import CalendarLocale from 'rc-calendar/lib/locale/zh_CN';
import TimePickerLocale from '../../time-picker/locale/zh_CN';

const locale = {
  lang: {
    placeholder: '请选择日期',
    rangePlaceholder: ['开始日期', '结束日期'],
    ...CalendarLocale,
  },
  timePickerLocale: {
    ...TimePickerLocale,
  },
};

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

// All settings at:
// https://github.com/ant-design/ant-design/blob/master/components/date-picker/locale/example.json

export default locale;