Function getDateFormatter

packages/common/src/i18n/format_date.ts:579–887

(format: string)

// See also explanations: http://cldr.unicode.org/translation/date-time
// TODO(ocombe): support all missing cldr formats: U, Q, D, F, e, j, J, C, A, v, V, X, x
function getDateFormatter(format: string): DateFormatter | null {
  if (DATE_FORMATS[format]) {
    return DATE_FORMATS[format];
  }
  let formatter;
  switch (format) {
    // Era name (AD/BC)
    case 'G':
    case 'GG':
    case 'GGG':
      formatter = dateStrGetter(TranslationType.Eras, TranslationWidth.Abbreviated);
      break;
    case 'GGGG':
      formatter = dateStrGetter(TranslationType.Eras, TranslationWidth.Wide);
      break;
    case 'GGGGG':
      formatter = dateStrGetter(TranslationType.Eras, TranslationWidth.Narrow);
      break;

    // 1 digit representation of the year, e.g. (AD 1 => 1, AD 199 => 199)
    case 'y':
      formatter = dateGetter(DateType.FullYear, 1, 0, false, true);
      break;
    // 2 digit representation of the year, padded (00-99). (e.g. AD 2001 => 01, AD 2010 => 10)
    case 'yy':
      formatter = dateGetter(DateType.FullYear, 2, 0, true, true);
      break;
    // 3 digit representation of the year, padded (000-999). (e.g. AD 2001 => 01, AD 2010 => 10)
    case 'yyy':
      formatter = dateGetter(DateType.FullYear, 3, 0, false, true);
      break;
    // 4 digit representation of the year (e.g. AD 1 => 0001, AD 2010 => 2010)
    case 'yyyy':
      formatter = dateGetter(DateType.FullYear, 4, 0, false, true);
      break;

    // 1 digit representation of the week-numbering year, e.g. (AD 1 => 1, AD 199 => 199)
    case 'Y':
      formatter = weekNumberingYearGetter(1);
      break;
    // 2 digit representation of the week-numbering year, padded (00-99). (e.g. AD 2001 => 01, AD
    // 2010 => 10)
    case 'YY':
      formatter = weekNumberingYearGetter(2, true);
      break;
    // 3 digit representation of the week-numbering year, padded (000-999). (e.g. AD 1 => 001, AD
    // 2010 => 2010)
    case 'YYY':
      formatter = weekNumberingYearGetter(3);
      break;
    // 4 digit representation of the week-numbering year (e.g. AD 1 => 0001, AD 2010 => 2010)
    case 'YYYY':
      formatter = weekNumberingYearGetter(4);
      break;

    // Month of the year (1-12), numeric
    case 'M':
    case 'L':