DateTimeImmutable::setTimestamp

(PHP 5 >= 5.5.0, PHP 7, PHP 8)

DateTimeImmutable::setTimestampSets the date and time based on a Unix timestamp

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public DateTimeImmutable::setTimestamp ( int $timestamp ) : DateTimeImmutable

Like DateTime::setTimestamp() but works with DateTimeImmutable.

User Contributed Notes

Philip 15-Jul-2021 11:03
This function will not change the value of the DateTimeImmutable object as the method name might suggest. The object, after all, immutable.

<?php
   $dti
= new DateTimeImmutable();
   echo
$dti->getTimestamp(); // e.g. 123456789
  
$dti->setTimestamp(987654321);
   echo
$dti->getTimestamp(); // 123456789

  
$x = $dti->setTimestamp (987654321);
   echo
$x->getTimestamp(); // 987654321
?>
ben at hl9 dot net 28-Dec-2018 07:21
Note that this is not the right way to initiate a \DateTimeImmutable object with a numeric Unix timestamp. 

<?php
// Wrong, despite the documention *kind of* alluding to it
$obj = \DateTimeImmutable::setTimestamp(time() - 1);

// Also won't work
$obj = new \DateTimeImmutable(time() - 1)

// Correct, works, clean single line
$obj = (new \DateTimeImmutable())->setTimestamp(time() - 1);
?>

... In fact, this is a non-static method and thus should not be called statically.