Function formatDate

packages/common/src/i18n/format_date.ts:87–136

(
  value: string | number | Date,
  format: string,
  locale: string,
  timezone?: string,
)

 * @publicApi
 */
export function formatDate(
  value: string | number | Date,
  format: string,
  locale: string,
  timezone?: string,
): string {
  let date = toDate(value);
  assertValidDateFormatLength(format);
  const namedFormat = getNamedFormat(locale, format);
  format = namedFormat || format;

  let parts: string[] = [];
  let match;
  while (format) {
    match = DATE_FORMATS_SPLIT.exec(format);
    if (match) {
      parts = parts.concat(match.slice(1));
      const part = parts.pop();
      if (!part) {
        break;
      }
      format = part;
    } else {
      parts.push(format);
      break;
    }
  }

  if (typeof ngDevMode === 'undefined' || ngDevMode) {
    assertValidDateFormat(parts);
  }

  let dateTimezoneOffset = date.getTimezoneOffset();
  if (timezone) {
    dateTimezoneOffset = timezoneToOffset(timezone, dateTimezoneOffset);
    date = convertTimezoneToLocal(date, timezone, true);
  }

  let text = '';
  parts.forEach((value) => {
    const dateFormatter = getDateFormatter(value);
    text += dateFormatter
      ? dateFormatter(date, locale, dateTimezoneOffset)
      : value === "''"
        ? "'"
        : value.replace(/(^'|'$)/g, '').replace(/''/g, "'");
  });

  return text;
}

function assertValidDateFormatLength(format: string) {
  if (format.length > MAX_DATE_FORMAT_LENGTH) {