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Bug #80047 DatePeriod doesn't support custom DateTimeImmutable
Submitted: 2020-09-03 12:01 UTC Modified: -
Avg. Score:3.0 ± 0.0
Reproduced:1 of 1 (100.0%)
Same Version:1 (100.0%)
Same OS:0 (0.0%)
From: oognic at gmail dot com Assigned:
Status: Open Package: Date/time related
PHP Version: 7.2.33 OS:
Private report: No CVE-ID: None
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 [2020-09-03 12:01 UTC] oognic at gmail dot com
If we create a custom class that inherits from DateTimeImmutable, this class can be given as parameter to DatePeriod.

However, when iterating or trying to get the start or end dates, DatePeriod will try to return instances of our custom class but without using its constructor, which will produce incoherent objects.

See this PR for more details:

Test script:

class CustomDateTimeImmutable extends \DateTimeImmutable {

    private $foo;

    public function __construct($time = "now", $timezone = NULL)
        parent::__construct($time, $timezone);
        $this->foo = "foo"; 
    public function getFoo()
        return $this->foo;


$datePeriod = new \DatePeriod(new CustomDateTimeImmutable('2020-01-01'), new \DateInterval('P1D'), (new CustomDateTimeImmutable('2020-01-03'))->modify('+1 day'));


$strings = [];
foreach ($datePeriod as $date) {

Expected result:

Actual result:


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