Online PHP editor | output for hjFnN

@ 2017-01-16T19:48:07Z

<?php

$ss = 'first day of this month midnight';
$es = 'first day of next month midnight - 1 second';
$s = new DateTime($ss);
$e = new DateTime($es);
$d= $e->diff($s);
var_dump($d->days); // 0 ... but should be 30
// This should be 0 because: 
// * "first day of last month midnight" is 2016-12-01T00:00:00"
// * "first day of this month midnight - 1 second" is 2016-12-01T23:59:59+11:00
// because right to left. First the expression "midnight -1 second" "first day of this month"
$s = (new DateTime(null))->setTimestamp(strtotime($ss)); // verbose setup method
$e = (new DateTime(null))->setTimestamp(strtotime($es)); // verbose setup method
$d = $e->diff($s);
var_dump($d->days); // 30 ... and should be 30
/*
Next we will try mix/match the code to see what happens, surprisingly it seems that the end date ($e)
is the important one, if it uses the verbose method it returns the correct values.
*/
$s = (new DateTime(null))->setTimestamp(strtotime($ss)); // verbose setup method
$e = new DateTime($es);
$d= $e->diff($s);
var_dump($d->days); // 0 ... but should be 30
$s = new DateTime($ss);
$e = (new DateTime(null))->setTimestamp(strtotime($es)); // verbose setup method
$d= $e->diff($s);
var_dump($d->days); // 30 ... and should be 30
/*
This test just proves that the $e date is important BUT NOT because it's the one we call the diff() method
on, that's just coincidental that seems to imply that the "- 1 second" in the date string is the problem.
*/
$s = new DateTime($ss);
$e = (new DateTime(null))->setTimestamp(strtotime($es)); // verbose setup method
$d= $s->diff($e);
var_dump($d->days); // 30 ... and should be 30
/*
[Workaround]
This final test seems to prove that the input string is important and that the "- 1 secord" has a negative knock-on
effect on the results of the diff. By modifying the datetime with ->modify everything works as expected ...
it just means you have to be careful of how we work with DateTimes .
*/
$s = new DateTime($ss);
$e = new DateTime('first day of this month midnight');
$e->modify('- 1 second');
var_dump($e->diff($s)->days); // 30 ... and should be 30


echo "\n\n Same stuff with DateTimeImmutable\n";

$s = new DateTimeImmutable($ss);
$e = new DateTimeImmutable($es);
$d= $e->diff($s);
var_dump($d->days); // 0 ... but should be 30
$s = (new DateTimeImmutable(null))->setTimestamp(strtotime($ss)); // verbose setup method
$e = (new DateTimeImmutable(null))->setTimestamp(strtotime($es)); // verbose setup method
$d = $e->diff($s);
var_dump($d->days); // 30 ... and should be 30
/*
Next we will try mix/match the code to see what happens, surprisingly it seems that the end date ($e)
is the important one, if it uses the verbose method it returns the correct values.
*/
$s = (new DateTimeImmutable(null))->setTimestamp(strtotime($ss)); // verbose setup method
$e = new DateTimeImmutable($es);
$d= $e->diff($s);
var_dump($d->days); // 0 ... but should be 30
$s = new DateTimeImmutable($ss);
$e = (new DateTimeImmutable(null))->setTimestamp(strtotime($es)); // verbose setup method
$d= $e->diff($s);
var_dump($d->days); // 30 ... and should be 30
/*
This test just proves that the $e date is important BUT NOT because it's the one we call the diff() method
on, that's just coincidental that seems to imply that the "- 1 second" in the date string is the problem.
*/
$s = new DateTimeImmutable($ss);
$e = (new DateTimeImmutable(null))->setTimestamp(strtotime($es)); // verbose setup method
$d= $s->diff($e);
var_dump($d->days); // 30 ... and should be 30
/*
[Workaround]
This final test seems to prove that the input string is important and that the "- 1 secord" has a negative knock-on
effect on the results of the diff. By modifying the datetime with ->modify everything works as expected ...
it just means you have to be careful of how we work with DateTimes .
*/
$s = new DateTimeImmutable($ss);
$e = new DateTimeImmutable('first day of this month midnight');
$e->modify('- 1 second');
var_dump($e->diff($s)->days); // 30 ... and should be 30

Output for 8.5.0: int(30) Deprecated: DateTime::__construct(): Passing null to parameter #1 ($datetime) of type string is deprecated in /in/hjFnN on line 13 Deprecated: DateTime::__construct(): Passing null to parameter #1 ($datetime) of type string is deprecated in /in/hjFnN on line 14 int(30) Deprecated: DateTime::__construct(): Passing null to parameter #1 ($datetime) of type string is deprecated in /in/hjFnN on line 21 int(30) Deprecated: DateTime::__construct(): Passing null to parameter #1 ($datetime) of type string is deprecated in /in/hjFnN on line 26 int(30) Deprecated: DateTime::__construct(): Passing null to parameter #1 ($datetime) of type string is deprecated in /in/hjFnN on line 34 int(30) int(0) Same stuff with DateTimeImmutable int(30) Deprecated: DateTimeImmutable::__construct(): Passing null to parameter #1 ($datetime) of type string is deprecated in /in/hjFnN on line 55 Deprecated: DateTimeImmutable::__construct(): Passing null to parameter #1 ($datetime) of type string is deprecated in /in/hjFnN on line 56 int(30) Deprecated: DateTimeImmutable::__construct(): Passing null to parameter #1 ($datetime) of type string is deprecated in /in/hjFnN on line 63 int(30) Deprecated: DateTimeImmutable::__construct(): Passing null to parameter #1 ($datetime) of type string is deprecated in /in/hjFnN on line 68 int(30) Deprecated: DateTimeImmutable::__construct(): Passing null to parameter #1 ($datetime) of type string is deprecated in /in/hjFnN on line 76 int(30) Warning: The return value of method DateTimeImmutable::modify() should either be used or intentionally ignored by casting it as (void), as DateTimeImmutable::modify() does not modify the object itself in /in/hjFnN on line 87 int(0)
Output for 8.4.15: /bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.35' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.34' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15)
Process exited with code 1.
Output for 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.28, 8.4.1 - 8.4.14: int(30) Deprecated: DateTime::__construct(): Passing null to parameter #1 ($datetime) of type string is deprecated in /in/hjFnN on line 13 Deprecated: DateTime::__construct(): Passing null to parameter #1 ($datetime) of type string is deprecated in /in/hjFnN on line 14 int(30) Deprecated: DateTime::__construct(): Passing null to parameter #1 ($datetime) of type string is deprecated in /in/hjFnN on line 21 int(30) Deprecated: DateTime::__construct(): Passing null to parameter #1 ($datetime) of type string is deprecated in /in/hjFnN on line 26 int(30) Deprecated: DateTime::__construct(): Passing null to parameter #1 ($datetime) of type string is deprecated in /in/hjFnN on line 34 int(30) int(0) Same stuff with DateTimeImmutable int(30) Deprecated: DateTimeImmutable::__construct(): Passing null to parameter #1 ($datetime) of type string is deprecated in /in/hjFnN on line 55 Deprecated: DateTimeImmutable::__construct(): Passing null to parameter #1 ($datetime) of type string is deprecated in /in/hjFnN on line 56 int(30) Deprecated: DateTimeImmutable::__construct(): Passing null to parameter #1 ($datetime) of type string is deprecated in /in/hjFnN on line 63 int(30) Deprecated: DateTimeImmutable::__construct(): Passing null to parameter #1 ($datetime) of type string is deprecated in /in/hjFnN on line 68 int(30) Deprecated: DateTimeImmutable::__construct(): Passing null to parameter #1 ($datetime) of type string is deprecated in /in/hjFnN on line 76 int(30) int(0)
Output for 7.0.20, 7.1.5 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30: int(30) int(30) int(30) int(30) int(30) int(0) Same stuff with DateTimeImmutable int(30) int(30) int(30) int(30) int(30) int(0)
Output for 5.6.0 - 5.6.29, 7.0.0 - 7.0.14, 7.1.0: int(0) int(30) int(0) int(30) int(30) int(0) Same stuff with DateTimeImmutable int(0) int(30) int(0) int(30) int(30) int(0)

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