👀 Views: 3 💬 Answers: 1 📅 Created: 2025-06-01

php datetime timezone PHP

I'm experiencing a question with `DateTimeImmutable` in PHP 8.1 when I attempt to add or subtract intervals with timezone changes. The behavior seems inconsistent, and I receive the wrong date output when daylight saving time changes are involved. For example, I'm trying to add a month to a date that falls within a daylight saving time transition. Here's a snippet of what I'm working with: ```php $date = new DateTimeImmutable('2023-03-12 01:00:00', new DateTimeZone('America/New_York')); $newDate = $date->add(new DateInterval('P1M')); echo $newDate->format('Y-m-d H:i:s'); // Expecting '2023-04-12 01:00:00' ``` However, the output I get is `2023-04-12 02:00:00`, which is not what I expect. I assumed that `DateTimeImmutable` would account for the timezone correctly, but it seems to be adding the interval without considering the DST change that happens on this date. I've checked the PHP documentation, but it doesn't clarify this behavior in detail. I've also tried using `DateTime` instead of `DateTimeImmutable`, but it results in the same unexpected output. Am I missing something in how I'm handling timezones or using `DateTimeImmutable`? Is there a recommended approach to handle such cases where DST transitions could affect date calculations?