diff --git a/src/Carbon/Traits/Date.php b/src/Carbon/Traits/Date.php
index 5837f6ec73..6738ace519 100644
--- a/src/Carbon/Traits/Date.php
+++ b/src/Carbon/Traits/Date.php
@@ -2613,8 +2613,12 @@ public function __call(string $method, array $parameters): mixed
                 );
             }
 
-            $method = 'diffIn'.$match[3];
-            $parameters['utc'] = ($mode === 'UTC');
+            $unit = self::pluralUnit($match[3]);
+            $method = 'diffIn'.ucfirst($unit);
+
+            if (\in_array($unit, ['days', 'weeks', 'months', 'quarters', 'years'])) {
+                $parameters['utc'] = ($mode === 'UTC');
+            }
 
             if (method_exists($this, $method)) {
                 return $this->$method(...$parameters);
diff --git a/tests/Carbon/DiffTest.php b/tests/Carbon/DiffTest.php
index b4929b3a25..00d49b760a 100644
--- a/tests/Carbon/DiffTest.php
+++ b/tests/Carbon/DiffTest.php
@@ -136,9 +136,11 @@ public function testDiffInMonthsWithTimezone()
 
         $this->assertSame(-1, (int) $first->diffInMonths($second, false));
         $this->assertSame(1, (int) $second->diffInMonths($first, false));
-        $this->assertVeryClose(-(1 + 6 / 24 / 31 + 1 / 24 / 28), $first->diffInMonths($second));
+        $this->assertSame($first->utc()->diffInMonths($second->utc()), $first->diffInMonths($second));
+        $this->assertSame($second->utc()->diffInMonths($first->utc()), $second->diffInMonths($first));
+        $this->assertVeryClose(-(1 + 1 / 24 / 31 + 6 / 24 / 28), $first->diffInMonths($second));
         // $second date in Toronto is 2021-12-31 18:00, so we have 6 hours in December (a 31 days month), and 1 hour in February (28 days month)
-        $this->assertVeryClose(1 + (7 / 24 / 28), $second->diffInMonths($first));
+        $this->assertVeryClose(1 + 1 / 24 / 31 + 6 / 24 / 28, $second->diffInMonths($first));
         // Considered in Berlin timezone, the 7 extra hours are in February (28 days month)
 
         $first = new Carbon('2022-02-01 01:00 Europe/Berlin');
@@ -146,7 +148,9 @@ public function testDiffInMonthsWithTimezone()
 
         $this->assertSame(0, (int) $first->diffInMonths($second, false));
         $this->assertSame(0, (int) $second->diffInMonths($first, false));
-        $this->assertVeryClose(-(1 - 6 / 24 / 31 + 1 / 24 / 28), $first->diffInMonths($second));
+        $this->assertSame($first->utc()->diffInMonths($second->utc()), $first->diffInMonths($second));
+        $this->assertSame($second->utc()->diffInMonths($first->utc()), $second->diffInMonths($first));
+        $this->assertVeryClose(-(1 - 5 / 24 / 31), $first->diffInMonths($second));
         $this->assertVeryClose(1 - 5 / 24 / 31, $second->diffInMonths($first));
     }
 
@@ -1868,10 +1872,10 @@ public function testFloatDiffWithRealUnits()
         date_default_timezone_set('UTC');
         $this->assertVeryClose(1.0006944444444446, Carbon::parse('2018-12-01 00:00')->floatDiffInRealDays(Carbon::parse('2018-12-02 00:01'), true));
 
-        $this->assertSame(1.0, Carbon::parse('2021-03-27 20:00 Europe/Warsaw')->floatDiffInRealDays('2021-03-28 20:00'));
-        $this->assertSame(2.0, Carbon::parse('2021-03-26 20:00 Europe/Warsaw')->floatDiffInRealDays('2021-03-28 20:00'));
-        $this->assertSame(2.0, Carbon::parse('2021-03-27 20:00 Europe/Warsaw')->floatDiffInRealDays('2021-03-29 20:00'));
-        $this->assertSame(1.0, Carbon::parse('2021-10-30 20:00 Europe/Warsaw')->floatDiffInRealDays('2021-10-31 20:00'));
+        $this->assertVeryClose(0.9583333333333334, Carbon::parse('2021-03-27 20:00 Europe/Warsaw')->floatDiffInRealDays('2021-03-28 20:00'));
+        $this->assertVeryClose(1.9583333333333335, Carbon::parse('2021-03-26 20:00 Europe/Warsaw')->floatDiffInRealDays('2021-03-28 20:00'));
+        $this->assertVeryClose(1.9583333333333335, Carbon::parse('2021-03-27 20:00 Europe/Warsaw')->floatDiffInRealDays('2021-03-29 20:00'));
+        $this->assertVeryClose(1.0416666666666667, Carbon::parse('2021-10-30 20:00 Europe/Warsaw')->floatDiffInRealDays('2021-10-31 20:00'));
         $this->assertVeryClose(1.0006944444444443, Carbon::parse('2018-12-01 00:00')->floatDiffInRealDays(Carbon::parse('2018-12-02 00:01')));
 
         $this->assertVeryClose(1.0006944444444443, Carbon::parse('2018-12-01 00:00')->floatDiffInRealDays(Carbon::parse('2018-12-02 00:01')));
@@ -1909,16 +1913,81 @@ public function testFloatDiffWithRealUnits()
         $this->assertVeryClose(5.325284965308378, Carbon::parse('2018-02-13 20:55:12.321456')->floatDiffInRealYears(Carbon::parse('2023-06-12 14:24:58.987421')));
         $this->assertVeryClose(-5.325284965308378, Carbon::parse('2023-06-12 14:24:58.987421')->floatDiffInRealYears(Carbon::parse('2018-02-13 20:55:12.321456')));
 
-        $this->assertSame(1.0, Carbon::parse('2018-10-01 00:00:00', 'Europe/Paris')->floatDiffInRealMonths(Carbon::parse('2018-11-01 00:00:00', 'Europe/Paris'), true));
+        $this->assertVeryClose(1.0336021505376345, Carbon::parse('2018-10-01 00:00:00', 'Europe/Paris')->floatDiffInRealMonths(Carbon::parse('2018-11-01 00:00:00', 'Europe/Paris'), true));
         $this->assertSame(1.0, Carbon::parse('2018-10-28 00:00:00')->floatDiffInRealMonths(Carbon::parse('2018-11-28 00:00:00'), true));
-        $this->assertSame(1.0, Carbon::parse('2018-10-28 00:00:00', 'Europe/Paris')->floatDiffInRealMonths(Carbon::parse('2018-11-28 00:00:00', 'Europe/Paris'), true));
+        $this->assertVeryClose(1.0013888888888889, Carbon::parse('2018-10-28 00:00:00', 'Europe/Paris')->floatDiffInRealMonths(Carbon::parse('2018-11-28 00:00:00', 'Europe/Paris'), true));
 
-        $this->assertSame(-1.0, Carbon::parse('2018-11-01 00:00:00', 'Europe/Paris')->floatDiffInRealMonths(Carbon::parse('2018-10-01 00:00:00', 'Europe/Paris')));
+        $this->assertVeryClose(-1.0336021505376345, Carbon::parse('2018-11-01 00:00:00', 'Europe/Paris')->floatDiffInRealMonths(Carbon::parse('2018-10-01 00:00:00', 'Europe/Paris')));
         $this->assertSame(-1.0, Carbon::parse('2018-11-28 00:00:00')->floatDiffInRealMonths(Carbon::parse('2018-10-28 00:00:00')));
-        $this->assertSame(-1.0, Carbon::parse('2018-11-28 00:00:00', 'Europe/Paris')->floatDiffInRealMonths(Carbon::parse('2018-10-28 00:00:00', 'Europe/Paris')));
+        $this->assertVeryClose(-1.0013888888888889, Carbon::parse('2018-11-28 00:00:00', 'Europe/Paris')->floatDiffInRealMonths(Carbon::parse('2018-10-28 00:00:00', 'Europe/Paris')));
 
         Carbon::setTestNow('2021-03-28 20:00 Europe/Warsaw');
-        $this->assertSame(1.0, Carbon::parse('2021-03-27 20:00 Europe/Warsaw')->floatDiffInRealDays());
+        $this->assertSame(0.9583333333333334, Carbon::parse('2021-03-27 20:00 Europe/Warsaw')->floatDiffInRealDays());
+    }
+
+    public function testFloatDiffWithUTCUnits()
+    {
+        $from = Carbon::parse('2021-03-27 20:00 Europe/Warsaw');
+        $to = Carbon::parse('2021-03-27 20:00 Europe/London');
+        $from->floatDiffInUtcDays($to);
+
+        $this->assertSame('2021-03-27 20:00:00 Europe/Warsaw', $from->format('Y-m-d H:i:s e'));
+        $this->assertSame('2021-03-27 20:00:00 Europe/London', $to->format('Y-m-d H:i:s e'));
+
+        date_default_timezone_set('UTC');
+        $this->assertVeryClose(1.0006944444444446, Carbon::parse('2018-12-01 00:00')->floatDiffInUtcDays(Carbon::parse('2018-12-02 00:01'), true));
+
+        $this->assertVeryClose(0.9583333333333334, Carbon::parse('2021-03-27 20:00 Europe/Warsaw')->floatDiffInUtcDays('2021-03-28 20:00'));
+        $this->assertVeryClose(1.9583333333333335, Carbon::parse('2021-03-26 20:00 Europe/Warsaw')->floatDiffInUtcDays('2021-03-28 20:00'));
+        $this->assertVeryClose(1.9583333333333335, Carbon::parse('2021-03-27 20:00 Europe/Warsaw')->floatDiffInUtcDays('2021-03-29 20:00'));
+        $this->assertVeryClose(1.0416666666666667, Carbon::parse('2021-10-30 20:00 Europe/Warsaw')->floatDiffInUtcDays('2021-10-31 20:00'));
+        $this->assertVeryClose(1.0006944444444443, Carbon::parse('2018-12-01 00:00')->floatDiffInUtcDays(Carbon::parse('2018-12-02 00:01')));
+
+        $this->assertVeryClose(1.0006944444444443, Carbon::parse('2018-12-01 00:00')->floatDiffInUtcDays(Carbon::parse('2018-12-02 00:01')));
+        $this->assertVeryClose(1.0006944444444443 / 7, Carbon::parse('2018-12-01 00:00')->floatDiffInUtcWeeks(Carbon::parse('2018-12-02 00:01')));
+
+        $this->assertVeryClose(0.9714742503779745, Carbon::parse('2018-03-13 20:55:12.321456')->floatDiffInUtcMonths(Carbon::parse('2018-04-12 14:24:58.987421'), true));
+        $this->assertVeryClose(0.9714742503779745, Carbon::parse('2018-04-12 14:24:58.987421')->floatDiffInUtcMonths(Carbon::parse('2018-03-13 20:55:12.321456'), true));
+        $this->assertVeryClose(0.9714742503779745, Carbon::parse('2018-03-13 20:55:12.321456')->floatDiffInUtcMonths(Carbon::parse('2018-04-12 14:24:58.987421'), false));
+        $this->assertVeryClose(-0.9714742503779745, Carbon::parse('2018-04-12 14:24:58.987421')->floatDiffInUtcMonths(Carbon::parse('2018-03-13 20:55:12.321456'), false));
+
+        $this->assertVeryClose(1.0006944444444443 / 7, Carbon::parse('2018-12-01 00:00')->floatDiffInUtcWeeks(Carbon::parse('2018-12-02 00:01')));
+        $this->assertVeryClose(1.0006944444444443 / 7, Carbon::parse('2018-12-01 00:00')->floatDiffInUtcWeeks(Carbon::parse('2018-12-02 00:01'), true));
+
+        $this->assertVeryClose(0.9714742503779745, Carbon::parse('2018-03-13 20:55:12.321456')->floatDiffInUtcMonths(Carbon::parse('2018-04-12 14:24:58.987421')));
+        $this->assertVeryClose(-0.9714742503779745, Carbon::parse('2018-04-12 14:24:58.987421')->floatDiffInUtcMonths(Carbon::parse('2018-03-13 20:55:12.321456')));
+
+        $this->assertVeryClose(16.557633744585264, Carbon::parse('2018-02-13 20:55:12.321456')->floatDiffInUtcMonths(Carbon::parse('2019-06-30 14:24:58.987421'), true));
+
+        $this->assertVeryClose(15.971474250377973, Carbon::parse('2018-02-13 20:55:12.321456')->floatDiffInUtcMonths(Carbon::parse('2019-06-12 14:24:58.987421'), true));
+        $this->assertVeryClose(15.971474250377973, Carbon::parse('2019-06-12 14:24:58.987421')->floatDiffInUtcMonths(Carbon::parse('2018-02-13 20:55:12.321456'), true));
+        $this->assertVeryClose(15.971474250377973, Carbon::parse('2018-02-13 20:55:12.321456')->floatDiffInUtcMonths(Carbon::parse('2019-06-12 14:24:58.987421')));
+        $this->assertVeryClose(-15.971474250377973, Carbon::parse('2019-06-12 14:24:58.987421')->floatDiffInUtcMonths(Carbon::parse('2018-02-13 20:55:12.321456')));
+
+        $this->assertSame(1.0, Carbon::parse('2018-02-13 20:55:12.321456')->floatDiffInUtcYears(Carbon::parse('2019-02-13 20:55:12.321456'), true));
+        $this->assertVeryClose(1.3746000338015283, Carbon::parse('2018-02-13 20:55:12.321456')->floatDiffInUtcYears(Carbon::parse('2019-06-30 14:24:58.987421'), true));
+        $this->assertVeryClose(0.9609014036645421, Carbon::parse('2018-02-13 20:55:12.321456')->floatDiffInUtcYears(Carbon::parse('2019-01-30 14:24:58.987421'), true));
+
+        $this->assertVeryClose(1.3252849653083778, Carbon::parse('2018-02-13 20:55:12.321456')->floatDiffInUtcYears(Carbon::parse('2019-06-12 14:24:58.987421'), true));
+        $this->assertVeryClose(1.3252849653083778, Carbon::parse('2019-06-12 14:24:58.987421')->floatDiffInUtcYears(Carbon::parse('2018-02-13 20:55:12.321456'), true));
+        $this->assertVeryClose(1.3252849653083778, Carbon::parse('2018-02-13 20:55:12.321456')->floatDiffInUtcYears(Carbon::parse('2019-06-12 14:24:58.987421')));
+        $this->assertVeryClose(-1.3252849653083778, Carbon::parse('2019-06-12 14:24:58.987421')->floatDiffInUtcYears(Carbon::parse('2018-02-13 20:55:12.321456')));
+
+        $this->assertVeryClose(5.325284965308378, Carbon::parse('2018-02-13 20:55:12.321456')->floatDiffInUtcYears(Carbon::parse('2023-06-12 14:24:58.987421'), true));
+        $this->assertVeryClose(5.325284965308378, Carbon::parse('2023-06-12 14:24:58.987421')->floatDiffInUtcYears(Carbon::parse('2018-02-13 20:55:12.321456'), true));
+        $this->assertVeryClose(5.325284965308378, Carbon::parse('2018-02-13 20:55:12.321456')->floatDiffInUtcYears(Carbon::parse('2023-06-12 14:24:58.987421')));
+        $this->assertVeryClose(-5.325284965308378, Carbon::parse('2023-06-12 14:24:58.987421')->floatDiffInUtcYears(Carbon::parse('2018-02-13 20:55:12.321456')));
+
+        $this->assertVeryClose(1.0336021505376345, Carbon::parse('2018-10-01 00:00:00', 'Europe/Paris')->floatDiffInUtcMonths(Carbon::parse('2018-11-01 00:00:00', 'Europe/Paris'), true));
+        $this->assertSame(1.0, Carbon::parse('2018-10-28 00:00:00')->floatDiffInUtcMonths(Carbon::parse('2018-11-28 00:00:00'), true));
+        $this->assertVeryClose(1.0013888888888889, Carbon::parse('2018-10-28 00:00:00', 'Europe/Paris')->floatDiffInUtcMonths(Carbon::parse('2018-11-28 00:00:00', 'Europe/Paris'), true));
+
+        $this->assertVeryClose(-1.0336021505376345, Carbon::parse('2018-11-01 00:00:00', 'Europe/Paris')->floatDiffInUtcMonths(Carbon::parse('2018-10-01 00:00:00', 'Europe/Paris')));
+        $this->assertSame(-1.0, Carbon::parse('2018-11-28 00:00:00')->floatDiffInUtcMonths(Carbon::parse('2018-10-28 00:00:00')));
+        $this->assertVeryClose(-1.0013888888888889, Carbon::parse('2018-11-28 00:00:00', 'Europe/Paris')->floatDiffInUtcMonths(Carbon::parse('2018-10-28 00:00:00', 'Europe/Paris')));
+
+        Carbon::setTestNow('2021-03-28 20:00 Europe/Warsaw');
+        $this->assertSame(0.9583333333333334, Carbon::parse('2021-03-27 20:00 Europe/Warsaw')->floatDiffInUtcDays());
     }
 
     /**
diff --git a/tests/CarbonImmutable/DiffTest.php b/tests/CarbonImmutable/DiffTest.php
index 67c7207bf6..f91aeef9b5 100644
--- a/tests/CarbonImmutable/DiffTest.php
+++ b/tests/CarbonImmutable/DiffTest.php
@@ -1684,15 +1684,35 @@ public function testFloatDiff()
 
     public function testFloatDiffWithRealUnits()
     {
-        date_default_timezone_set('UTC');
+        $from = Carbon::parse('2021-03-27 20:00 Europe/Warsaw');
+        $to = Carbon::parse('2021-03-27 20:00 Europe/London');
+        $from->floatDiffInRealDays($to);
+
+        $this->assertSame('2021-03-27 20:00:00 Europe/Warsaw', $from->format('Y-m-d H:i:s e'));
+        $this->assertSame('2021-03-27 20:00:00 Europe/London', $to->format('Y-m-d H:i:s e'));
 
+        date_default_timezone_set('UTC');
         $this->assertVeryClose(1.0006944444444446, Carbon::parse('2018-12-01 00:00')->floatDiffInRealDays(Carbon::parse('2018-12-02 00:01'), true));
-        $this->assertVeryClose(1.0006944444444446 / 7, Carbon::parse('2018-12-01 00:00')->floatDiffInRealWeeks(Carbon::parse('2018-12-02 00:01'), true));
 
-        $this->assertVeryClose(0.9714742503779743, Carbon::parse('2018-03-13 20:55:12.321456')->floatDiffInRealMonths(Carbon::parse('2018-04-12 14:24:58.987421'), true));
-        $this->assertVeryClose(0.9714742503779743, Carbon::parse('2018-04-12 14:24:58.987421')->floatDiffInRealMonths(Carbon::parse('2018-03-13 20:55:12.321456'), true));
-        $this->assertVeryClose(0.9714742503779743, Carbon::parse('2018-03-13 20:55:12.321456')->floatDiffInRealMonths(Carbon::parse('2018-04-12 14:24:58.987421')));
-        $this->assertVeryClose(-0.9714742503779743, Carbon::parse('2018-04-12 14:24:58.987421')->floatDiffInRealMonths(Carbon::parse('2018-03-13 20:55:12.321456')));
+        $this->assertVeryClose(0.9583333333333334, Carbon::parse('2021-03-27 20:00 Europe/Warsaw')->floatDiffInRealDays('2021-03-28 20:00'));
+        $this->assertVeryClose(1.9583333333333335, Carbon::parse('2021-03-26 20:00 Europe/Warsaw')->floatDiffInRealDays('2021-03-28 20:00'));
+        $this->assertVeryClose(1.9583333333333335, Carbon::parse('2021-03-27 20:00 Europe/Warsaw')->floatDiffInRealDays('2021-03-29 20:00'));
+        $this->assertVeryClose(1.0416666666666667, Carbon::parse('2021-10-30 20:00 Europe/Warsaw')->floatDiffInRealDays('2021-10-31 20:00'));
+        $this->assertVeryClose(1.0006944444444443, Carbon::parse('2018-12-01 00:00')->floatDiffInRealDays(Carbon::parse('2018-12-02 00:01')));
+
+        $this->assertVeryClose(1.0006944444444443, Carbon::parse('2018-12-01 00:00')->floatDiffInRealDays(Carbon::parse('2018-12-02 00:01')));
+        $this->assertVeryClose(1.0006944444444443 / 7, Carbon::parse('2018-12-01 00:00')->floatDiffInRealWeeks(Carbon::parse('2018-12-02 00:01')));
+
+        $this->assertVeryClose(0.9714742503779745, Carbon::parse('2018-03-13 20:55:12.321456')->floatDiffInRealMonths(Carbon::parse('2018-04-12 14:24:58.987421'), true));
+        $this->assertVeryClose(0.9714742503779745, Carbon::parse('2018-04-12 14:24:58.987421')->floatDiffInRealMonths(Carbon::parse('2018-03-13 20:55:12.321456'), true));
+        $this->assertVeryClose(0.9714742503779745, Carbon::parse('2018-03-13 20:55:12.321456')->floatDiffInRealMonths(Carbon::parse('2018-04-12 14:24:58.987421'), false));
+        $this->assertVeryClose(-0.9714742503779745, Carbon::parse('2018-04-12 14:24:58.987421')->floatDiffInRealMonths(Carbon::parse('2018-03-13 20:55:12.321456'), false));
+
+        $this->assertVeryClose(1.0006944444444443 / 7, Carbon::parse('2018-12-01 00:00')->floatDiffInRealWeeks(Carbon::parse('2018-12-02 00:01')));
+        $this->assertVeryClose(1.0006944444444443 / 7, Carbon::parse('2018-12-01 00:00')->floatDiffInRealWeeks(Carbon::parse('2018-12-02 00:01'), true));
+
+        $this->assertVeryClose(0.9714742503779745, Carbon::parse('2018-03-13 20:55:12.321456')->floatDiffInRealMonths(Carbon::parse('2018-04-12 14:24:58.987421')));
+        $this->assertVeryClose(-0.9714742503779745, Carbon::parse('2018-04-12 14:24:58.987421')->floatDiffInRealMonths(Carbon::parse('2018-03-13 20:55:12.321456')));
 
         $this->assertVeryClose(16.557633744585264, Carbon::parse('2018-02-13 20:55:12.321456')->floatDiffInRealMonths(Carbon::parse('2019-06-30 14:24:58.987421'), true));
 
@@ -1715,13 +1735,81 @@ public function testFloatDiffWithRealUnits()
         $this->assertVeryClose(5.325284965308378, Carbon::parse('2018-02-13 20:55:12.321456')->floatDiffInRealYears(Carbon::parse('2023-06-12 14:24:58.987421')));
         $this->assertVeryClose(-5.325284965308378, Carbon::parse('2023-06-12 14:24:58.987421')->floatDiffInRealYears(Carbon::parse('2018-02-13 20:55:12.321456')));
 
-        $this->assertSame(1.0, Carbon::parse('2018-10-01 00:00:00', 'Europe/Paris')->floatDiffInRealMonths(Carbon::parse('2018-11-01 00:00:00', 'Europe/Paris'), true));
+        $this->assertVeryClose(1.0336021505376345, Carbon::parse('2018-10-01 00:00:00', 'Europe/Paris')->floatDiffInRealMonths(Carbon::parse('2018-11-01 00:00:00', 'Europe/Paris'), true));
         $this->assertSame(1.0, Carbon::parse('2018-10-28 00:00:00')->floatDiffInRealMonths(Carbon::parse('2018-11-28 00:00:00'), true));
-        $this->assertSame(1.0, Carbon::parse('2018-10-28 00:00:00', 'Europe/Paris')->floatDiffInRealMonths(Carbon::parse('2018-11-28 00:00:00', 'Europe/Paris'), true));
+        $this->assertVeryClose(1.0013888888888889, Carbon::parse('2018-10-28 00:00:00', 'Europe/Paris')->floatDiffInRealMonths(Carbon::parse('2018-11-28 00:00:00', 'Europe/Paris'), true));
 
-        $this->assertSame(-1.0, Carbon::parse('2018-11-01 00:00:00', 'Europe/Paris')->floatDiffInRealMonths(Carbon::parse('2018-10-01 00:00:00', 'Europe/Paris')));
+        $this->assertVeryClose(-1.0336021505376345, Carbon::parse('2018-11-01 00:00:00', 'Europe/Paris')->floatDiffInRealMonths(Carbon::parse('2018-10-01 00:00:00', 'Europe/Paris')));
         $this->assertSame(-1.0, Carbon::parse('2018-11-28 00:00:00')->floatDiffInRealMonths(Carbon::parse('2018-10-28 00:00:00')));
-        $this->assertSame(-1.0, Carbon::parse('2018-11-28 00:00:00', 'Europe/Paris')->floatDiffInRealMonths(Carbon::parse('2018-10-28 00:00:00', 'Europe/Paris')));
+        $this->assertVeryClose(-1.0013888888888889, Carbon::parse('2018-11-28 00:00:00', 'Europe/Paris')->floatDiffInRealMonths(Carbon::parse('2018-10-28 00:00:00', 'Europe/Paris')));
+
+        Carbon::setTestNow('2021-03-28 20:00 Europe/Warsaw');
+        $this->assertSame(0.9583333333333334, Carbon::parse('2021-03-27 20:00 Europe/Warsaw')->floatDiffInRealDays());
+    }
+
+    public function testFloatDiffWithUTCUnits()
+    {
+        $from = Carbon::parse('2021-03-27 20:00 Europe/Warsaw');
+        $to = Carbon::parse('2021-03-27 20:00 Europe/London');
+        $from->floatDiffInUtcDays($to);
+
+        $this->assertSame('2021-03-27 20:00:00 Europe/Warsaw', $from->format('Y-m-d H:i:s e'));
+        $this->assertSame('2021-03-27 20:00:00 Europe/London', $to->format('Y-m-d H:i:s e'));
+
+        date_default_timezone_set('UTC');
+        $this->assertVeryClose(1.0006944444444446, Carbon::parse('2018-12-01 00:00')->floatDiffInUtcDays(Carbon::parse('2018-12-02 00:01'), true));
+
+        $this->assertVeryClose(0.9583333333333334, Carbon::parse('2021-03-27 20:00 Europe/Warsaw')->floatDiffInUtcDays('2021-03-28 20:00'));
+        $this->assertVeryClose(1.9583333333333335, Carbon::parse('2021-03-26 20:00 Europe/Warsaw')->floatDiffInUtcDays('2021-03-28 20:00'));
+        $this->assertVeryClose(1.9583333333333335, Carbon::parse('2021-03-27 20:00 Europe/Warsaw')->floatDiffInUtcDays('2021-03-29 20:00'));
+        $this->assertVeryClose(1.0416666666666667, Carbon::parse('2021-10-30 20:00 Europe/Warsaw')->floatDiffInUtcDays('2021-10-31 20:00'));
+        $this->assertVeryClose(1.0006944444444443, Carbon::parse('2018-12-01 00:00')->floatDiffInUtcDays(Carbon::parse('2018-12-02 00:01')));
+
+        $this->assertVeryClose(1.0006944444444443, Carbon::parse('2018-12-01 00:00')->floatDiffInUtcDays(Carbon::parse('2018-12-02 00:01')));
+        $this->assertVeryClose(1.0006944444444443 / 7, Carbon::parse('2018-12-01 00:00')->floatDiffInUtcWeeks(Carbon::parse('2018-12-02 00:01')));
+
+        $this->assertVeryClose(0.9714742503779745, Carbon::parse('2018-03-13 20:55:12.321456')->floatDiffInUtcMonths(Carbon::parse('2018-04-12 14:24:58.987421'), true));
+        $this->assertVeryClose(0.9714742503779745, Carbon::parse('2018-04-12 14:24:58.987421')->floatDiffInUtcMonths(Carbon::parse('2018-03-13 20:55:12.321456'), true));
+        $this->assertVeryClose(0.9714742503779745, Carbon::parse('2018-03-13 20:55:12.321456')->floatDiffInUtcMonths(Carbon::parse('2018-04-12 14:24:58.987421'), false));
+        $this->assertVeryClose(-0.9714742503779745, Carbon::parse('2018-04-12 14:24:58.987421')->floatDiffInUtcMonths(Carbon::parse('2018-03-13 20:55:12.321456'), false));
+
+        $this->assertVeryClose(1.0006944444444443 / 7, Carbon::parse('2018-12-01 00:00')->floatDiffInUtcWeeks(Carbon::parse('2018-12-02 00:01')));
+        $this->assertVeryClose(1.0006944444444443 / 7, Carbon::parse('2018-12-01 00:00')->floatDiffInUtcWeeks(Carbon::parse('2018-12-02 00:01'), true));
+
+        $this->assertVeryClose(0.9714742503779745, Carbon::parse('2018-03-13 20:55:12.321456')->floatDiffInUtcMonths(Carbon::parse('2018-04-12 14:24:58.987421')));
+        $this->assertVeryClose(-0.9714742503779745, Carbon::parse('2018-04-12 14:24:58.987421')->floatDiffInUtcMonths(Carbon::parse('2018-03-13 20:55:12.321456')));
+
+        $this->assertVeryClose(16.557633744585264, Carbon::parse('2018-02-13 20:55:12.321456')->floatDiffInUtcMonths(Carbon::parse('2019-06-30 14:24:58.987421'), true));
+
+        $this->assertVeryClose(15.971474250377973, Carbon::parse('2018-02-13 20:55:12.321456')->floatDiffInUtcMonths(Carbon::parse('2019-06-12 14:24:58.987421'), true));
+        $this->assertVeryClose(15.971474250377973, Carbon::parse('2019-06-12 14:24:58.987421')->floatDiffInUtcMonths(Carbon::parse('2018-02-13 20:55:12.321456'), true));
+        $this->assertVeryClose(15.971474250377973, Carbon::parse('2018-02-13 20:55:12.321456')->floatDiffInUtcMonths(Carbon::parse('2019-06-12 14:24:58.987421')));
+        $this->assertVeryClose(-15.971474250377973, Carbon::parse('2019-06-12 14:24:58.987421')->floatDiffInUtcMonths(Carbon::parse('2018-02-13 20:55:12.321456')));
+
+        $this->assertSame(1.0, Carbon::parse('2018-02-13 20:55:12.321456')->floatDiffInUtcYears(Carbon::parse('2019-02-13 20:55:12.321456'), true));
+        $this->assertVeryClose(1.3746000338015283, Carbon::parse('2018-02-13 20:55:12.321456')->floatDiffInUtcYears(Carbon::parse('2019-06-30 14:24:58.987421'), true));
+        $this->assertVeryClose(0.9609014036645421, Carbon::parse('2018-02-13 20:55:12.321456')->floatDiffInUtcYears(Carbon::parse('2019-01-30 14:24:58.987421'), true));
+
+        $this->assertVeryClose(1.3252849653083778, Carbon::parse('2018-02-13 20:55:12.321456')->floatDiffInUtcYears(Carbon::parse('2019-06-12 14:24:58.987421'), true));
+        $this->assertVeryClose(1.3252849653083778, Carbon::parse('2019-06-12 14:24:58.987421')->floatDiffInUtcYears(Carbon::parse('2018-02-13 20:55:12.321456'), true));
+        $this->assertVeryClose(1.3252849653083778, Carbon::parse('2018-02-13 20:55:12.321456')->floatDiffInUtcYears(Carbon::parse('2019-06-12 14:24:58.987421')));
+        $this->assertVeryClose(-1.3252849653083778, Carbon::parse('2019-06-12 14:24:58.987421')->floatDiffInUtcYears(Carbon::parse('2018-02-13 20:55:12.321456')));
+
+        $this->assertVeryClose(5.325284965308378, Carbon::parse('2018-02-13 20:55:12.321456')->floatDiffInUtcYears(Carbon::parse('2023-06-12 14:24:58.987421'), true));
+        $this->assertVeryClose(5.325284965308378, Carbon::parse('2023-06-12 14:24:58.987421')->floatDiffInUtcYears(Carbon::parse('2018-02-13 20:55:12.321456'), true));
+        $this->assertVeryClose(5.325284965308378, Carbon::parse('2018-02-13 20:55:12.321456')->floatDiffInUtcYears(Carbon::parse('2023-06-12 14:24:58.987421')));
+        $this->assertVeryClose(-5.325284965308378, Carbon::parse('2023-06-12 14:24:58.987421')->floatDiffInUtcYears(Carbon::parse('2018-02-13 20:55:12.321456')));
+
+        $this->assertVeryClose(1.0336021505376345, Carbon::parse('2018-10-01 00:00:00', 'Europe/Paris')->floatDiffInUtcMonths(Carbon::parse('2018-11-01 00:00:00', 'Europe/Paris'), true));
+        $this->assertSame(1.0, Carbon::parse('2018-10-28 00:00:00')->floatDiffInUtcMonths(Carbon::parse('2018-11-28 00:00:00'), true));
+        $this->assertVeryClose(1.0013888888888889, Carbon::parse('2018-10-28 00:00:00', 'Europe/Paris')->floatDiffInUtcMonths(Carbon::parse('2018-11-28 00:00:00', 'Europe/Paris'), true));
+
+        $this->assertVeryClose(-1.0336021505376345, Carbon::parse('2018-11-01 00:00:00', 'Europe/Paris')->floatDiffInUtcMonths(Carbon::parse('2018-10-01 00:00:00', 'Europe/Paris')));
+        $this->assertSame(-1.0, Carbon::parse('2018-11-28 00:00:00')->floatDiffInUtcMonths(Carbon::parse('2018-10-28 00:00:00')));
+        $this->assertVeryClose(-1.0013888888888889, Carbon::parse('2018-11-28 00:00:00', 'Europe/Paris')->floatDiffInUtcMonths(Carbon::parse('2018-10-28 00:00:00', 'Europe/Paris')));
+
+        Carbon::setTestNow('2021-03-28 20:00 Europe/Warsaw');
+        $this->assertSame(0.9583333333333334, Carbon::parse('2021-03-27 20:00 Europe/Warsaw')->floatDiffInUtcDays());
     }
 
     /**
diff --git a/tests/Jenssegers/TranslationTest.php b/tests/Jenssegers/TranslationTest.php
index 809c650b3d..555bdd1ace 100644
--- a/tests/Jenssegers/TranslationTest.php
+++ b/tests/Jenssegers/TranslationTest.php
@@ -77,7 +77,6 @@ public function testCustomSuffix()
         $this->assertSame('vor 5 Sekunden', $date->ago());
     }
 
-    /** @group i */
     public function testTimespanTranslated()
     {
         JenssegersDate::setLocale('nl');