ZonedDateTime::getIntervalTo and Instant::getIntervalTo

src/Instant.php

@@ -333,6 +333,15 @@ public function atTimeZone(TimeZone $timeZone): ZonedDateTime
         return ZonedDateTime::ofInstant($this, $timeZone);
     }
 
+    /**
+     * Returns Interval from this Instant and the given one (exclusive).
+     * @throws DateTimeException If given Instant is before that this Instant
+     * */
+    public function getIntervalTo(Instant $that): Interval
+    {
+        return Interval::of($this, $that);
+    }
+
     /**
      * Returns a decimal representation of the timestamp represented by this instant.
      *

src/ZonedDateTime.php

@@ -435,6 +435,15 @@ public function plusDuration(Duration $duration): ZonedDateTime
         return ZonedDateTime::ofInstant($this->instant->plus($duration), $this->timeZone);
     }
 
+    /**
+     * Returns Interval from this ZonedDateTime and the given one (exclusive).
+     * @throws DateTimeException If given date is before this date
+     * */
+    public function getIntervalTo(ZonedDateTime $that): Interval
+    {
+        return $this->getInstant()->getIntervalTo($that->getInstant());
+    }
+
     /**
      * Returns a Duration representing the time elapsed between this ZonedDateTime and the given one.
      * This method will return a negative duration if the given ZonedDateTime is before the current one.

tests/InstantTest.php

@@ -583,6 +583,27 @@ public function providerIsBetweenInclusive(): array
         ];
     }
 
+    /**
+     * @dataProvider providerGetIntervalTo
+     */
+    public function testGetIntervalTo(int $firstSecond, int $firstNano, int $secondSecond, int $secondNano, string $expectedInterval): void
+    {
+        $actualResult = Instant::of($firstSecond, $firstNano)->getIntervalTo(Instant::of($secondSecond, $secondNano));
+
+        $this->assertSame($expectedInterval, (string)$actualResult);
+    }
+
+    public function providerGetIntervalTo(): array
+    {
+        return [
+            [1672567200, 0,       1672567200, 0,       '2023-01-01T10:00Z/2023-01-01T10:00Z'],
+            [1672567200, 0,       1672567210, 0,       '2023-01-01T10:00Z/2023-01-01T10:00:10Z'],
+            [1672567200, 1000000, 1672567210, 2000000, '2023-01-01T10:00:00.001Z/2023-01-01T10:00:10.002Z'],
+            [1672567200, 1,       1672567200, 9,       '2023-01-01T10:00:00.000000001Z/2023-01-01T10:00:00.000000009Z'],
+            [1672567200, 0,       1672653600, 0,       '2023-01-01T10:00Z/2023-01-02T10:00Z'],
+        ];
+    }
+
     /**
      * @dataProvider providerToDecimal
      *

tests/ZonedDateTimeTest.php

@@ -857,6 +857,29 @@ public function providerGetDurationTo(): array
         ];
     }
 
+    /**
+     * @dataProvider providerGetIntervalTo
+     */
+    public function testGetIntervalTo(string $firstDate, string $secondDate, string $expectedInterval): void
+    {
+        $actualResult = ZonedDateTime::parse($firstDate)->getIntervalTo(ZonedDateTime::parse($secondDate));
+
+        $this->assertSame($expectedInterval, (string)$actualResult);
+    }
+
+    public function providerGetIntervalTo(): array
+    {
+        return [
+            ['2023-01-01T10:00:00Z',           '2023-01-01T10:00:00Z',           '2023-01-01T10:00Z/2023-01-01T10:00Z'],
+            ['2023-01-01T10:00:00Z',           '2023-01-01T10:00:10Z',           '2023-01-01T10:00Z/2023-01-01T10:00:10Z'],
+            ['2023-01-01T10:00:00.001Z',       '2023-01-01T10:00:10.002Z',       '2023-01-01T10:00:00.001Z/2023-01-01T10:00:10.002Z'],
+            ['2023-01-01T10:00:00.001Z',       '2023-01-01T13:00:10.002+03:00',  '2023-01-01T10:00:00.001Z/2023-01-01T10:00:10.002Z'],
+            ['2023-01-01T10:00:00.001+03:00',  '2023-01-01T13:00:10.002+03:00',  '2023-01-01T07:00:00.001Z/2023-01-01T10:00:10.002Z'],
+            ['2023-01-01T10:00:00.000000001Z', '2023-01-01T10:00:00.000000009Z', '2023-01-01T10:00:00.000000001Z/2023-01-01T10:00:00.000000009Z'],
+            ['2023-01-01T10:00:00Z',           '2023-01-02T10:00:00Z',           '2023-01-01T10:00Z/2023-01-02T10:00Z'],
+        ];
+    }
+
     private function getTestZonedDateTime(): ZonedDateTime
     {
         $timeZone = TimeZone::parse('America/Los_Angeles');