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<?php $d1 = new DateTime('2010-06-17 14:00:00', new DateTimeZone('America/Montreal')); $d2 = new DateTime('2010-06-17 14:00:00', new DateTimeZone('America/Santiago')); echo "D1: " . $d1->getTimezone()->getName() . "\n"; echo "D2: " . $d2->getTimezone()->getName() . "\n"; // D1: America/Montreal // D2: America/Santiago echo "D1 Format: " . $d1->format('Y-m-d H:i:sO') . "\n"; echo "D2 Format: " . $d2->format('Y-m-d H:i:sO') . "\n"; // D1 Format: 2010-06-17 14:00:00-0400 // D2 Format: 2010-06-17 14:00:00-0400 $d3 = DateTime::createFromFormat('Y-m-d H:i:sO', '2010-06-17 14:00:00-0400'); echo "D3: " . $d3->getTimezone()->getName() . "\n"; echo "D3 Format: " . $d3->format('Y-m-d H:i:sO') . "\n"; // D3: -04:00 // D3: 2010-06-17 14:00:00-0400 $d1->modify('+5 month'); $d2->modify('+5 month'); $d3->modify('+5 month'); echo "D1 Format: " . $d1->format('Y-m-d H:i:sO') . "\n"; echo "D2 Format: " . $d2->format('Y-m-d H:i:sO') . "\n"; echo "D3 Format: " . $d3->format('Y-m-d H:i:sO') . "\n"; // D1 Format: 2010-11-17 14:00:00-0500 // D2 Format: 2010-11-17 14:00:00-0300 // D3 Format: 2010-11-17 14:00:00-0400 // this following code may be implementable using @PrePersist/@PreUpdate and @PostLoad $d4 = DateTime::createFromFormat('Y-m-d H:i:s', '2010-06-17 14:00:00'); $d4->setTimeZone(new DateTimeZone('America/Montreal')); $d5 = DateTime::createFromFormat('Y-m-d H:i:s', '2010-06-17 14:00:00'); $d5->setTimeZone(new DateTimeZone('America/Santiago')); $d4->modify('+5 month'); $d5->modify('+5 month'); echo "D4 Format: " . $d4->format('Y-m-d H:i:sO') . "\n"; echo "D5 Format: " . $d5->format('Y-m-d H:i:sO') . "\n"; // yields wrong results however // D4 Format: 2010-11-17 08:00:00-0500 // D5 Format: 2010-11-17 08:00:00-0300 // This is the correct way, cannot be implemented currently however in a decent way $d6 = DateTime::createFromFormat('Y-m-d H:i:s', '2010-06-17 14:00:00', new DateTimeZone('America/Montreal')); $d7 = DateTime::createFromFormat('Y-m-d H:i:s', '2010-06-17 14:00:00', new DateTimeZone('America/Santiago')); $d6->modify('+5 month'); $d7->modify('+5 month'); echo "D6 Format: " . $d6->format('Y-m-d H:i:sO') . "\n"; echo "D7 Format: " . $d7->format('Y-m-d H:i:sO') . "\n"; // correct results: // D6 Format: 2010-11-17 14:00:00-0500 // D7 Format: 2010-11-17 14:00:00-0300