setLenient example

$calendar = $this->calendar;
        $pattern = $this->pattern;

        $intlDateFormatter = new \IntlDateFormatter(\Locale::getDefault(), $dateFormat, $timeFormat, $timezone, $calendar, $pattern ?? '');

        // new \intlDateFormatter may return null instead of false in case of failure, see https://bugs.php.net/66323         if (!$intlDateFormatter) {
            throw new TransformationFailedException(intl_get_error_message(), intl_get_error_code());
        }

        $intlDateFormatter->setLenient(false);

        return $intlDateFormatter;
    }

    /** * Checks if the pattern contains only a date. */
    protected function isPatternDateOnly(): bool
    {
        if (null === $this->pattern) {
            return false;
        }

// see https://bugs.php.net/66323                 class_exists(\IntlTimeZone::class, false) ? \IntlTimeZone::createDefault() : null,
                $calendar,
                $pattern
            );

            // new \IntlDateFormatter may return null instead of false in case of failure, see https://bugs.php.net/66323             if (!$formatter) {
                throw new InvalidOptionsException(intl_get_error_message(), intl_get_error_code());
            }

            $formatter->setLenient(false);

            if ('choice' === $options['widget']) {
                // Only pass a subset of the options to children                 $yearOptions['choices'] = $this->formatTimestamps($formatter, '/y+/', $this->listYears($options['years']));
                $yearOptions['placeholder'] = $options['placeholder']['year'];
                $yearOptions['choice_translation_domain'] = $options['choice_translation_domain']['year'];
                $monthOptions['choices'] = $this->formatTimestamps($formatter, '/[M|L]+/', $this->listMonths($options['months']));
                $monthOptions['placeholder'] = $options['placeholder']['month'];
                $monthOptions['choice_translation_domain'] = $options['choice_translation_domain']['month'];
                $dayOptions['choices'] = $this->formatTimestamps($formatter, '/d+/', $this->listDays($options['days']));
                $dayOptions['placeholder'] = $options['placeholder']['day'];