note 107254 added to class.datetime

Here are some SimpleTest assertions for DateTime, all of which pass. This should shed some light on how comparison operators work with DateTime objects in PHP. /** * Let's make some basic assertions about how DateTime comparison works, * for demonstration purposes. (Turns out, the equality operators work * like you'd think, at least on the surface. Note, however, that the * operators compare the global time under the covers, and DO NOT take * time zone into account; if two times are equal in UTC but have different * time zones, they'll compare as equal.) */ public function test_compare_DateTime_objects() { $utc1980_1 = new DateTime('1980-01-01 00:00:00', new DateTimeZone('UTC')); $utc1980_2 = new DateTime('1980-01-01 00:00:00', new DateTimeZone('UTC')); $est1980_1 = new DateTime('1980-01-01 00:00:00', new DateTimeZone('US/Eastern')); $est1980_minus5 = new DateTime('1979-12-31 19:00:00', new DateTimeZone('US/Eastern')); // midnight UTC $utc2000_1 = new DateTime('2000-01-01 00:00:00', new DateTimeZone('UTC')); $this->assertEqual($utc1980_1, $utc1980_2); $this->assertTrue($utc1980_1 == $utc1980_2); $this->assertFalse($utc1980_1 === $utc1980_2); // memory reference comparison should fail $this->assertNotEqual($utc1980_1, $est1980_1); $this->assertFalse($utc1980_1 == $est1980_1); // note this is different in UTC // the following assertion proves that for the == operator, only the UTC time is considered; // 1979-12-31 19:00:00 EST == 1980-01-01 00:00:00 UTC is true, even though time zone differs $this->assertTrue($utc1980_1 == $est1980_minus5); $this->assertTrue($utc1980_2 == $est1980_minus5); $this->assertFalse($utc1980_1 === $est1980_1); $this->assertNotEqual($utc1980_1, $utc2000_1); $this->assertFalse($utc1980_1 == $utc2000_1); $this->assertFalse($utc1980_1 === $utc2000_1); $this->assertFalse($utc1980_1 > $utc1980_2); $this->assertFalse($utc1980_1 < $utc1980_2); $this->assertTrue($utc1980_1 < $utc2000_1); $this->assertFalse($utc1980_1 > $utc2000_1); $this->assertFalse($utc2000_1 < $utc1980_1); $this->assertTrue($utc2000_1 > $utc1980_1); $this->assertFalse($utc1980_1 < $est1980_minus5); $this->assertFalse($utc1980_1 > $est1980_minus5); $this->assertTrue($utc2000_1 > $est1980_minus5); $this->assertFalse($utc2000_1 < $est1980_minus5); } ---- Server IP: 192.41.42.26 Probable Submitter: 64.242.113.237 ---- Manual Page -- http://www.php.net/manual/en/class.datetime.php Edit -- https://master.php.net/note/edit/107254 Del: integrated -- https://master.php.net/note/delete/107254/integrated Del: useless -- https://master.php.net/note/delete/107254/useless Del: bad code -- https://master.php.net/note/delete/107254/bad+code Del: spam -- https://master.php.net/note/delete/107254/spam Del: non-english -- https://master.php.net/note/delete/107254/non-english Del: in docs -- https://master.php.net/note/delete/107254/in+docs Del: other reasons-- https://master.php.net/note/delete/107254 Reject -- https://master.php.net/note/reject/107254 Search -- https://master.php.net/manage/user-notes.php