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<?php // Create two identical DateTime objects $a = new DateTime("2015-02-01 00:00:00", new DateTimeZone("PST")); $b = clone $a; // They should be equal (and they are) compare($a, $b); // Now change the timezone to EST. $b->setTimezone(new DateTimeZone("EST")); //The actual timestamp should not change (it does not in PHP 5.4) so $a should still be equal to $b, but it will say $a > $b. compare($a, $b); function compare($a, $b) { var_dump($a); var_dump($b); echo ($a > $b ? '$a > $b' : ($a < $b ? '$a < $b' : ($a == $b ? '$a == $b' : 'undefined'))) . "\n"; }
Output for 7.0.17 - 7.0.33, 7.1.3 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.28, 8.4.1 - 8.4.14, 8.5.0
object(DateTime)#1 (3) { ["date"]=> string(26) "2015-02-01 00:00:00.000000" ["timezone_type"]=> int(2) ["timezone"]=> string(3) "PST" } object(DateTime)#2 (3) { ["date"]=> string(26) "2015-02-01 00:00:00.000000" ["timezone_type"]=> int(2) ["timezone"]=> string(3) "PST" } $a == $b object(DateTime)#1 (3) { ["date"]=> string(26) "2015-02-01 00:00:00.000000" ["timezone_type"]=> int(2) ["timezone"]=> string(3) "PST" } object(DateTime)#2 (3) { ["date"]=> string(26) "2015-02-01 03:00:00.000000" ["timezone_type"]=> int(2) ["timezone"]=> string(3) "EST" } $a == $b
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 5.5.14 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.16, 7.1.0 - 7.1.2
object(DateTime)#1 (3) { ["date"]=> string(26) "2015-02-01 00:00:00.000000" ["timezone_type"]=> int(2) ["timezone"]=> string(3) "PST" } object(DateTime)#2 (3) { ["date"]=> string(26) "2015-02-01 00:00:00.000000" ["timezone_type"]=> int(2) ["timezone"]=> string(3) "PST" } $a == $b object(DateTime)#1 (3) { ["date"]=> string(26) "2015-02-01 00:00:00.000000" ["timezone_type"]=> int(2) ["timezone"]=> string(3) "PST" } object(DateTime)#2 (3) { ["date"]=> string(26) "2015-02-01 03:00:00.000000" ["timezone_type"]=> int(2) ["timezone"]=> string(3) "EST" } $a > $b
Output for 5.5.10 - 5.5.13
object(DateTime)#1 (3) { ["date"]=> string(19) "2015-02-01 00:00:00" ["timezone_type"]=> int(2) ["timezone"]=> string(3) "PST" } object(DateTime)#2 (3) { ["date"]=> string(19) "2015-02-01 00:00:00" ["timezone_type"]=> int(2) ["timezone"]=> string(3) "PST" } $a == $b object(DateTime)#1 (3) { ["date"]=> string(19) "2015-02-01 00:00:00" ["timezone_type"]=> int(2) ["timezone"]=> string(3) "PST" } object(DateTime)#2 (3) { ["date"]=> string(19) "2015-02-01 03:00:00" ["timezone_type"]=> int(2) ["timezone"]=> string(3) "EST" } $a > $b
Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.29, 5.5.0 - 5.5.9
object(DateTime)#1 (3) { ["date"]=> string(19) "2015-02-01 00:00:00" ["timezone_type"]=> int(3) ["timezone"]=> string(19) "America/Los_Angeles" } object(DateTime)#2 (3) { ["date"]=> string(19) "2015-02-01 00:00:00" ["timezone_type"]=> int(3) ["timezone"]=> string(19) "America/Los_Angeles" } $a == $b object(DateTime)#1 (3) { ["date"]=> string(19) "2015-02-01 00:00:00" ["timezone_type"]=> int(3) ["timezone"]=> string(19) "America/Los_Angeles" } object(DateTime)#2 (3) { ["date"]=> string(19) "2015-02-01 03:00:00" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "America/New_York" } $a == $b
Output for 5.4.30 - 5.4.45
object(DateTime)#1 (3) { ["date"]=> string(26) "2015-02-01 00:00:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(19) "America/Los_Angeles" } object(DateTime)#2 (3) { ["date"]=> string(26) "2015-02-01 00:00:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(19) "America/Los_Angeles" } $a == $b object(DateTime)#1 (3) { ["date"]=> string(26) "2015-02-01 00:00:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(19) "America/Los_Angeles" } object(DateTime)#2 (3) { ["date"]=> string(26) "2015-02-01 03:00:00.000000" ["timezone_type"]=> int(3) ["timezone"]=> string(16) "America/New_York" } $a == $b
Output for 5.2.0 - 5.2.17
object(DateTime)#1 (0) { } object(DateTime)#2 (0) { } $a == $b object(DateTime)#1 (0) { } object(DateTime)#2 (0) { } $a == $b
Output for 5.0.0 - 5.0.5, 5.1.0 - 5.1.6
Fatal error: Class 'DateTime' not found in /in/dTOrf on line 4
Process exited with code 255.
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_VARIABLE in /in/dTOrf on line 5
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1
Parse error: parse error, unexpected T_VARIABLE in /in/dTOrf on line 5
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/dTOrf on line 5
Process exited with code 255.
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