Bug #80831 [Nab]: IntlDateFormatter considers January 2021 days to be January 2020 days

Edit report at https://bugs.php.net/bug.php?id=80831&edit=1 ID: 80831 Updated by: derick@php.net Reported by: sebastian@php.net Summary: IntlDateFormatter considers January 2021 days to be January 2020 days Status: Not a bug Type: Bug Package: Date/time related Operating System: Irrelevant PHP Version: 8.0.3RC1 Block user comment: N Private report: N New Comment: https://unicode-org.github.io/icu/userguide/format_parse/datetime/ Previous Comments: ------------------------------------------------------------------------ [2021-03-04 16:20:47] derick@php.net Sorry, but your problem does not imply a bug in PHP itself. For a list of more appropriate places to ask for help using PHP, please visit http://www.php.net/support.php as this bug system is not the appropriate forum for asking support questions. Due to the volume of reports we can not explain in detail here why your report is not a bug. The support channels will be able to provide an explanation for you. Thank you for your interest in PHP. There is a difference between a natural year and an ISO year, and I think "Y" is the ISO year (belonging to full ISO weeks and days) in Intl speak, I think. You want just "y". ------------------------------------------------------------------------ [2021-03-04 16:12:27] sebastian@php.net Description: ------------ I have DateTimeImmutable objects representing days/dates in January 2021. When I format these objects using an IntlDateFormatter object with the "MMMM Y" formatting string then the first three days of January 2021 are printed as January 2020. Test script: --------------- <?php declare(strict_types=1); $formatter = new IntlDateFormatter( 'de_DE', IntlDateFormatter::FULL, IntlDateFormatter::FULL, 'Europe/Berlin', IntlDateFormatter::GREGORIAN, 'MMMM Y' ); var_dump($formatter->format(new DateTimeImmutable('2021-01-01'))); var_dump($formatter->format(new DateTimeImmutable('2021-01-02'))); var_dump($formatter->format(new DateTimeImmutable('2021-01-03'))); var_dump($formatter->format(new DateTimeImmutable('2021-01-04'))); Expected result: ---------------- string(11) "Januar 2021" string(11) "Januar 2021" string(11) "Januar 2021" string(11) "Januar 2021" Actual result: -------------- string(11) "Januar 2020" string(11) "Januar 2020" string(11) "Januar 2020" string(11) "Januar 2021" ------------------------------------------------------------------------ -- Edit this bug report at https://bugs.php.net/bug.php?id=80831&edit=1