yii\i18n\Formatter::formatDateTimeValue PHP Метод

    private function formatDateTimeValue($value, $format, $type)
    {
        $timeZone = $this->timeZone;
        // avoid time zone conversion for date-only values
        if ($type === 'date') {
            list($timestamp, $hasTimeInfo) = $this->normalizeDatetimeValue($value, true);
            if (!$hasTimeInfo) {
                $timeZone = $this->defaultTimeZone;
            }
        } else {
            $timestamp = $this->normalizeDatetimeValue($value);
        }
        if ($timestamp === null) {
            return $this->nullDisplay;
        }
        // intl does not work with dates >=2038 or <=1901 on 32bit machines, fall back to PHP
        $year = $timestamp->format('Y');
        if ($this->_intlLoaded && !(PHP_INT_SIZE === 4 && ($year <= 1901 || $year >= 2038))) {
            if (strncmp($format, 'php:', 4) === 0) {
                $format = FormatConverter::convertDatePhpToIcu(substr($format, 4));
            }
            if (isset($this->_dateFormats[$format])) {
                if ($type === 'date') {
                    $formatter = new IntlDateFormatter($this->locale, $this->_dateFormats[$format], IntlDateFormatter::NONE, $timeZone, $this->calendar);
                } elseif ($type === 'time') {
                    $formatter = new IntlDateFormatter($this->locale, IntlDateFormatter::NONE, $this->_dateFormats[$format], $timeZone, $this->calendar);
                } else {
                    $formatter = new IntlDateFormatter($this->locale, $this->_dateFormats[$format], $this->_dateFormats[$format], $timeZone, $this->calendar);
                }
            } else {
                $formatter = new IntlDateFormatter($this->locale, IntlDateFormatter::NONE, IntlDateFormatter::NONE, $timeZone, $this->calendar, $format);
            }
            if ($formatter === null) {
                throw new InvalidConfigException(intl_get_error_message());
            }
            // make IntlDateFormatter work with DateTimeImmutable
            if ($timestamp instanceof \DateTimeImmutable) {
                $timestamp = new DateTime($timestamp->format(DateTime::ISO8601), $timestamp->getTimezone());
            }
            return $formatter->format($timestamp);
        } else {
            if (strncmp($format, 'php:', 4) === 0) {
                $format = substr($format, 4);
            } else {
                $format = FormatConverter::convertDateIcuToPhp($format, $type, $this->locale);
            }
            if ($timeZone != null) {
                if ($timestamp instanceof \DateTimeImmutable) {
                    $timestamp = $timestamp->setTimezone(new DateTimeZone($timeZone));
                } else {
                    $timestamp->setTimezone(new DateTimeZone($timeZone));
                }
            }
            return $timestamp->format($format);
        }
    }