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@ 2015-04-14T06:53:59Z

<?php

$DF_MYSQL = 'Y-m-d H:i:s';

$dtB = DateTime::createFromFormat($DF_MYSQL, '2015-04-02 09:44:47');
$dtA = DateTime::createFromFormat($DF_MYSQL, '2014-02-16 02:00:00');

// DateInterval: B-A
$diDiff = $dtA->diff($dtB);

// Unix Timestamp: B-A
$tsDiff = $dtB->getTimestamp() - $dtA->getTimestamp();

// REPORT DIFFERENCES
/*
   NOTE: DIFFERENCE B-A IS
      $y => 1
      $m => 1
      $d => 17
      $h => 7
      $i => 44
      $s => 47
*/
print_r($diDiff);

// Unix Timestamp: CALCULATE A FROM (B - DIFFERENCE) AND REPORT
// NOTE: CORRECT RESULT, SAME AS $dtA: 2014-02-16 02:00:00
$tsShift = $dtB->getTimestamp() - $tsDiff;
$dtOut = new DateTime();
$dtOut->setTimestamp($tsShift);
print_r($dtOut);

// DateInterval: CALCULATE A FROM (B - DIFFERENCE) AND REPORT
// NOTE: INCORRECT RESULT, DIFFERENT FROM $dtA: 2014-02-13 02:00:00
$dtB->sub($diDiff);
print_r($dtB);

Output for git.master, git.master_jit, rfc.property-hooks: DateInterval Object ( [y] => 1 [m] => 1 [d] => 17 [h] => 7 [i] => 44 [s] => 47 [f] => 0 [invert] => 0 [days] => 410 [from_string] => ) DateTime Object ( [date] => 2014-02-16 02:00:00.000000 [timezone_type] => 3 [timezone] => Europe/Amsterdam ) DateTime Object ( [date] => 2014-02-13 02:00:00.000000 [timezone_type] => 3 [timezone] => Europe/Amsterdam )

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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