zero parts can be omitted in date interval input

Author: xabbuh

Normalizer/DateIntervalNormalizer.php

@@ -105,7 +105,7 @@ public function denormalize($data, $type, $format = null, array $context = [])
                 $dateIntervalFormat = substr($dateIntervalFormat, 2);
                 break;
         }
-        $valuePattern = '/^'.$signPattern.preg_replace('/%([yYmMdDhHiIsSwW])(\w)/', '(?P<$1>\d+)$2', $dateIntervalFormat).'$/';
+        $valuePattern = '/^'.$signPattern.preg_replace('/%([yYmMdDhHiIsSwW])(\w)/', '(?:(?P<$1>\d+)$2)?', preg_replace('/(T.*)$/', '($1)?', $dateIntervalFormat)).'$/';
         if (!preg_match($valuePattern, $data)) {
             throw new UnexpectedValueException(sprintf('Value "%s" contains intervals not accepted by format "%s".', $data, $dateIntervalFormat));
         }

Tests/Normalizer/DateIntervalNormalizerTest.php

@@ -124,6 +124,14 @@ public function testLegacyDenormalizeUsingFormatPassedInConstructor($format, $in
         $this->doTestDenormalizeUsingFormatPassedInConstructor($format, $input, $output, true);
     }
 
+    public function testDenormalizeIntervalsWithOmittedPartsBeingZero()
+    {
+        $normalizer = new DateIntervalNormalizer();
+
+        $this->assertDateIntervalEquals($this->getInterval('P3Y2M4DT0H0M0S'), $normalizer->denormalize('P3Y2M4D', \DateInterval::class));
+        $this->assertDateIntervalEquals($this->getInterval('P0Y0M0DT12H34M0S'), $normalizer->denormalize('PT12H34M', \DateInterval::class));
+    }
+
     private function doTestDenormalizeUsingFormatPassedInConstructor($format, $input, $output, bool $legacy = false)
     {
         $normalizer = $legacy ? new DateIntervalNormalizer($format) : new DateIntervalNormalizer([DateIntervalNormalizer::FORMAT_KEY => $format]);