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Bug #80047 DatePeriod doesn't support custom DateTimeImmutable
Submitted: 2020-09-03 12:01 UTC Modified: 2022-06-24 10:22 UTC
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: derick (profile)
Status: Closed Package: Date/time related
PHP Version: 7.2.33 OS:
Private report: No CVE-ID: None
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From: oognic at gmail dot com
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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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 [2022-06-24 10:22 UTC]
-Status: Open +Status: Closed -Assigned To: +Assigned To: derick
 [2022-06-24 10:22 UTC]
The fix for this bug has been committed.
If you are still experiencing this bug, try to check out latest source from and re-test.
Thank you for the report, and for helping us make PHP better.

The fix that I have committed is to *now* allow inherited objects here.

The DatePeriod iterator needs to construct DateTime/DateTimeImmutable objects which can only done by copying internal data, which can't be recreated by calling the constructor of an inherited class. This data needs to be directly injected into a (new) DateTime/DateTimeImmutable object.
 [2022-06-25 16:53 UTC]
Automatic comment on behalf of derickr
Log: Fixed #80047: DatePeriod doesn't warn with custom DateTimeImmutable
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Last updated: Mon Jun 27 23:05:45 2022 UTC