DateTime asDate()

in lib/src/intl/date_builder.dart [181:230]
33 lines of code
8 McCabe index (conditional complexity)

  DateTime asDate({int retries = 3}) {
    // TODO(alanknight): Validate the date, especially for things which
    // can crash the VM, e.g. large month values.
    if (_date != null) return _date!;

    DateTime preliminaryResult;
    final hasCentury = !_hasAmbiguousCentury || year < 0 || year >= 100;
    if (hasCentury) {
      preliminaryResult = _dateTimeConstructor(year, month, dayOrDayOfYear,
          hour24, minute, second, fractionalSecond, utc);
    } else {
      var now = clock.now();
      if (utc) {
        now = now.toUtc();
      }

      const lookBehindYears = 80;
      var lowerDate = _offsetYear(now, -lookBehindYears);
      var upperDate = _offsetYear(now, 100 - lookBehindYears);
      var lowerCentury = (lowerDate.year ~/ 100) * 100;
      var upperCentury = (upperDate.year ~/ 100) * 100;
      preliminaryResult = _dateTimeConstructor(upperCentury + year, month,
          dayOrDayOfYear, hour24, minute, second, fractionalSecond, utc);

      // Our interval must be half-open since there otherwise could be ambiguity
      // for a date that is exactly 20 years in the future or exactly 80 years
      // in the past (mod 100).  We'll treat the lower-bound date as the
      // exclusive bound because:
      // * It's farther away from the present, and we're less likely to care
      //   about it.
      // * By the time this function exits, time will have advanced to favor
      //   the upper-bound date.
      //
      // We don't actually need to check both bounds.
      if (preliminaryResult.compareTo(upperDate) <= 0) {
        // Within range.
        assert(preliminaryResult.compareTo(lowerDate) > 0);
      } else {
        preliminaryResult = _dateTimeConstructor(lowerCentury + year, month,
            dayOrDayOfYear, hour24, minute, second, fractionalSecond, utc);
      }
    }

    if (utc && hasCentury) {
      _date = preliminaryResult;
    } else {
      _date = _correctForErrors(preliminaryResult, retries);
    }
    return _date!;
  }