Почему эта разница во времени, когда я использую "IntlDateFormatter"?
<?php
// php v7.1
$pattern = 'yyyy-MM-dd HH:mm:ss';
$timezone = "Europe/Budapest";
$inputDateTimeStr = '1890-01-01 00:00:00';
$locale = 'hu_HU';
$intlDateFormatter = new \IntlDateFormatter( $locale, \IntlDateFormatter::MEDIUM, \IntlDateFormatter::SHORT, \IntlTimeZone::createTimeZone($timezone), \IntlDateFormatter::GREGORIAN, $pattern
);
$dateTime = new \DateTime($inputDateTimeStr);
$dateTime->setTimezone(new \DateTimeZone($timezone));
$outputDateTimeStr = $intlDateFormatter->format($dateTime->getTimestamp());
print ' in: ' . $inputDateTimeStr
. ' out: ' . $outputDateTimeStr // string(19) "1890-01-01 00:16:20"
. ' diff: ' . ( strtotime($outputDateTimeStr) - strtotime($inputDateTimeStr) ) . ' seconds';
Вывод: в: 1890-01-01 00:00:00, выход: 1890-01-01 00: 16: 20 diff: 980 секунд