diff --git a/src/Carbon/CarbonInterval.php b/src/Carbon/CarbonInterval.php
index aab960eb3..dcfcaa721 100644
--- a/src/Carbon/CarbonInterval.php
+++ b/src/Carbon/CarbonInterval.php
@@ -41,6 +41,7 @@
 use ReflectionException;
 use ReturnTypeWillChange;
 use RuntimeException;
+use Symfony\Contracts\Translation\TranslatorInterface;
 use Throwable;
 
 /**
@@ -1705,7 +1706,9 @@ protected function getForHumansParameters($syntax = null, $short = false, $parts
             ':optional-space' => $optionalSpace,
         ];
 
-        return [$syntax, $short, $parts, $options, $join, $aUnit, $altNumbers, $interpolations, $minimumUnit, $skip];
+        $translator ??= isset($locale) ? Translator::get($locale) : null;
+
+        return [$syntax, $short, $parts, $options, $join, $aUnit, $altNumbers, $interpolations, $minimumUnit, $skip, $translator];
     }
 
     protected static function getRoundingMethodFromOptions(int $options): ?string
@@ -1822,7 +1825,9 @@ public function getValuesSequence(): array
      *                           `  - if $join is missing, a space will be used as glue
      *                           - 'minimumUnit' entry determines the smallest unit of time to display can be long or
      *                           `  short form of the units, e.g. 'hour' or 'h' (default value: s)
-     *                           if int passed, it add modifiers:
+     *                           - 'locale' language in which the diff should be output (has no effect if 'translator' key is set)
+     *                           - 'translator' a custom translator to use to translator the output.
+     *                           if int passed, it adds modifiers:
      *                           Possible values:
      *                           - CarbonInterface::DIFF_ABSOLUTE          no modifiers
      *                           - CarbonInterface::DIFF_RELATIVE_TO_NOW   add ago/from now modifier
@@ -1838,7 +1843,8 @@ public function getValuesSequence(): array
      */
     public function forHumans($syntax = null, $short = false, $parts = self::NO_LIMIT, $options = null): string
     {
-        [$syntax, $short, $parts, $options, $join, $aUnit, $altNumbers, $interpolations, $minimumUnit, $skip] = $this
+        /* @var TranslatorInterface|null $translator */
+        [$syntax, $short, $parts, $options, $join, $aUnit, $altNumbers, $interpolations, $minimumUnit, $skip, $translator] = $this
             ->getForHumansParameters($syntax, $short, $parts, $options);
 
         $interval = [];
@@ -1852,8 +1858,7 @@ public function forHumans($syntax = null, $short = false, $parts = self::NO_LIMI
         $transId = $relativeToNow ? ($isFuture ? 'from_now' : 'ago') : ($isFuture ? 'after' : 'before');
         $declensionMode = null;
 
-        /** @var Translator $translator */
-        $translator = $this->getLocalTranslator();
+        $translator ??= $this->getLocalTranslator();
 
         $handleDeclensions = function ($unit, $count, $index = 0, $parts = 1) use ($interpolations, $transId, $translator, $altNumbers, $absolute, &$declensionMode) {
             if (!$absolute) {
diff --git a/src/Carbon/Traits/Difference.php b/src/Carbon/Traits/Difference.php
index 735fe8f5f..310607eb4 100644
--- a/src/Carbon/Traits/Difference.php
+++ b/src/Carbon/Traits/Difference.php
@@ -499,7 +499,9 @@ public function secondsUntilEndOfDay(): float
      *                                                            - 'other' entry (see above)
      *                                                            - 'minimumUnit' entry determines the smallest unit of time to display can be long or
      *                                                            `  short form of the units, e.g. 'hour' or 'h' (default value: s)
-     *                                                            if int passed, it add modifiers:
+     *                                                            - 'locale' language in which the diff should be output (has no effect if 'translator' key is set)
+     *                                                            - 'translator' a custom translator to use to translator the output.
+     *                                                            if int passed, it adds modifiers:
      *                                                            Possible values:
      *                                                            - CarbonInterface::DIFF_ABSOLUTE          no modifiers
      *                                                            - CarbonInterface::DIFF_RELATIVE_TO_NOW   add ago/from now modifier
diff --git a/src/Carbon/Traits/IntervalRounding.php b/src/Carbon/Traits/IntervalRounding.php
index 24cac6943..e27c7bab7 100644
--- a/src/Carbon/Traits/IntervalRounding.php
+++ b/src/Carbon/Traits/IntervalRounding.php
@@ -42,7 +42,7 @@ protected function roundWith(DateInterval|string|float|int $precision, callable|
         $unit = 'second';
 
         if ($precision instanceof DateInterval) {
-            $precision = (string) CarbonInterval::instance($precision)->locale('');
+            $precision = CarbonInterval::instance($precision)->forHumans(['locale' => 'en']);
         }
 
         if (\is_string($precision) && preg_match('/^\s*(?<precision>\d+)?\s*(?<unit>\w+)(?<other>\W.*)?$/', $precision, $match)) {
diff --git a/tests/Carbon/LocalizationTest.php b/tests/Carbon/LocalizationTest.php
index bce5fec51..0c2229241 100644
--- a/tests/Carbon/LocalizationTest.php
+++ b/tests/Carbon/LocalizationTest.php
@@ -14,6 +14,7 @@
 namespace Tests\Carbon;
 
 use Carbon\Carbon;
+use Carbon\CarbonInterface;
 use Carbon\CarbonInterval;
 use Carbon\Language;
 use Carbon\Translator;
@@ -462,14 +463,44 @@ public function testAddCustomTranslation()
         // en_Boring inherit en because it starts with "en", see symfony-translation behavior
         $this->assertSame('3 boring days 4 hours', $diff);
 
+        Carbon::setLocale('en');
+
+        $diff = Carbon::parse('2018-01-01')
+            ->diffForHumans('2018-01-04 04:00', [
+                'syntax' => CarbonInterface::DIFF_ABSOLUTE,
+                'parts' => 2,
+                'locale' => 'de',
+            ]);
+
+        $this->assertSame('3 Tage 4 Stunden', $diff);
+
         $translator->resetMessages();
 
         $this->assertSame([], $translator->getMessages());
 
-        Carbon::setLocale('en');
         $this->assertSame('en', Carbon::getLocale());
     }
 
+    public function testLocaleOption()
+    {
+        $translator = Translator::get('en_Boring');
+        $translator->setTranslations([
+            'day' => ':count boring day|:count boring days',
+        ]);
+
+        $diff = Carbon::parse('2018-01-01')
+            ->diffForHumans('2018-01-04 04:00', [
+                'syntax' => CarbonInterface::DIFF_ABSOLUTE,
+                'parts' => 2,
+                'locale' => 'en_Boring',
+            ]);
+
+        $translator->setLocale('en');
+        $translator->resetMessages();
+
+        $this->assertSame('3 boring days 4 hours', $diff);
+    }
+
     public function testCustomWeekStart()
     {
         Carbon::setLocale('ru');