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

import CalendarLocale from 'rc-picker/lib/locale/nl_BE';
import TimePickerLocale from '../../time-picker/locale/nl_BE';
import type { PickerLocale } from '../generatePicker';

// Merge into a locale object
const locale: PickerLocale = {
  lang: {
    monthPlaceholder: 'Selecteer maand',
    placeholder: 'Selecteer datum',
    quarterPlaceholder: 'Selecteer kwartaal',
    rangeMonthPlaceholder: ['Begin maand', 'Eind maand'],
    rangePlaceholder: ['Begin datum', 'Eind datum'],
    rangeWeekPlaceholder: ['Begin week', 'Eind week'],
    rangeYearPlaceholder: ['Begin jaar', 'Eind jaar'],
    weekPlaceholder: 'Selecteer week',
    yearPlaceholder: 'Selecteer jaar',
    ...CalendarLocale,
  },
  timePickerLocale: {
    ...TimePickerLocale,
  },
};

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

export default locale;