PHP 8.2 - Trouble with DateTime immutability when parsing ISO 8601 strings
I've been struggling with this for a few days now and could really use some help. I'm working with an scenario with PHP 8.2 regarding the immutability of the DateTime object when parsing ISO 8601 strings. I have a function that takes a date string in ISO 8601 format and returns a formatted date. However, I'm noticing that the DateTime object is mutating unexpectedly, leading to incorrect outputs. Here’s the code snippet I’m using: ```php function formatIsoDate(string $isoDate): string { $dateTime = new DateTime($isoDate); // Trying to modify the DateTime object $dateTime->modify('+1 day'); return $dateTime->format('Y-m-d'); } ``` When I call `formatIsoDate('2023-10-25T14:30:00Z')`, I expect it to return `2023-10-26`, but instead, I'm getting `2023-10-25`. It seems like the original DateTime object is being returned without the modification. I've double-checked the ISO date format and it seems correct. Also, I've tried explicitly creating a new instance to ensure immutability: ```php function formatIsoDateImmutable(string $isoDate): string { $dateTime = new DateTime($isoDate); $newDateTime = clone $dateTime; $newDateTime->modify('+1 day'); return $newDateTime->format('Y-m-d'); } ``` However, this approach also gives me `2023-10-25`. Is there something I'm missing about how DateTime or immutability works in PHP 8.2? Any help would be greatly appreciated! For context: I'm using Php on Ubuntu.