diff --git a/src/Carbon/Traits/Difference.php b/src/Carbon/Traits/Difference.php
index 2df1e64214..21753c8685 100644
--- a/src/Carbon/Traits/Difference.php
+++ b/src/Carbon/Traits/Difference.php
@@ -454,7 +454,7 @@ public function floatDiffInDays($date = null, $absolute = true)
     {
         $hoursDiff = $this->floatDiffInHours($date, $absolute);
 
-        return ($hoursDiff < 0 ? -1 : 1) * $this->diffInDays($date) + ($hoursDiff % static::HOURS_PER_DAY) / static::HOURS_PER_DAY;
+        return ($hoursDiff < 0 ? -1 : 1) * $this->diffInDays($date) + fmod($hoursDiff, static::HOURS_PER_DAY) / static::HOURS_PER_DAY;
     }
 
     /**
@@ -584,7 +584,7 @@ public function floatDiffInRealDays($date = null, $absolute = true)
     {
         $hoursDiff = $this->floatDiffInRealHours($date, $absolute);
 
-        return ($hoursDiff < 0 ? -1 : 1) * $this->diffInDays($date) + ($hoursDiff % static::HOURS_PER_DAY) / static::HOURS_PER_DAY;
+        return ($hoursDiff < 0 ? -1 : 1) * $this->diffInDays($date) + fmod($hoursDiff, static::HOURS_PER_DAY) / static::HOURS_PER_DAY;
     }
 
     /**
diff --git a/tests/Carbon/DiffTest.php b/tests/Carbon/DiffTest.php
index 2c023409cf..93910b431c 100644
--- a/tests/Carbon/DiffTest.php
+++ b/tests/Carbon/DiffTest.php
@@ -1511,34 +1511,36 @@ public function testFloatDiff()
 
         $this->assertSame(8986.665965, Carbon::parse('2018-03-31 23:55:12.321456')->floatDiffInSeconds(Carbon::parse('2018-04-01 02:24:58.987421')));
 
-        $this->assertSame(0.9707885304659498, Carbon::parse('2018-03-13 20:55:12.321456')->floatDiffInMonths(Carbon::parse('2018-04-12 14:24:58.987421')));
+        $this->assertSame(1.0006944444444443, Carbon::parse('2018-12-01 00:00')->floatDiffInDays(Carbon::parse('2018-12-02 00:01')));
+
+        $this->assertSame(0.9714742503779745, Carbon::parse('2018-03-13 20:55:12.321456')->floatDiffInMonths(Carbon::parse('2018-04-12 14:24:58.987421')));
         $this->assertSame(1.1724137931034484, Carbon::parse('2000-01-15 00:00')->floatDiffInMonths(Carbon::parse('2000-02-20 00:00')));
         $this->assertSame(1.1724137931034484, Carbon::parse('2000-01-15 00:00')->floatDiffInMonths('2000-02-20 00:00'));
         $this->assertSame(11.951612903225806, Carbon::parse('2018-12-16 00:00')->floatDiffInMonths('2019-12-15 00:00'));
-        $this->assertSame(0.9707885304659498, Carbon::parse('2018-04-12 14:24:58.987421')->floatDiffInMonths(Carbon::parse('2018-03-13 20:55:12.321456')));
-        $this->assertSame(0.9707885304659498, Carbon::parse('2018-03-13 20:55:12.321456')->floatDiffInMonths(Carbon::parse('2018-04-12 14:24:58.987421'), false));
-        $this->assertSame(-0.9707885304659498, Carbon::parse('2018-04-12 14:24:58.987421')->floatDiffInMonths(Carbon::parse('2018-03-13 20:55:12.321456'), false));
+        $this->assertSame(0.9714742503779745, Carbon::parse('2018-04-12 14:24:58.987421')->floatDiffInMonths(Carbon::parse('2018-03-13 20:55:12.321456')));
+        $this->assertSame(0.9714742503779745, Carbon::parse('2018-03-13 20:55:12.321456')->floatDiffInMonths(Carbon::parse('2018-04-12 14:24:58.987421'), false));
+        $this->assertSame(-0.9714742503779745, Carbon::parse('2018-04-12 14:24:58.987421')->floatDiffInMonths(Carbon::parse('2018-03-13 20:55:12.321456'), false));
 
-        $this->assertSame(16.556944444444444, Carbon::parse('2018-02-13 20:55:12.321456')->floatDiffInMonths(Carbon::parse('2019-06-30 14:24:58.987421')));
+        $this->assertSame(16.557633744585264, Carbon::parse('2018-02-13 20:55:12.321456')->floatDiffInMonths(Carbon::parse('2019-06-30 14:24:58.987421')));
 
-        $this->assertSame(15.97078853046595, Carbon::parse('2018-02-13 20:55:12.321456')->floatDiffInMonths(Carbon::parse('2019-06-12 14:24:58.987421')));
-        $this->assertSame(15.97078853046595, Carbon::parse('2019-06-12 14:24:58.987421')->floatDiffInMonths(Carbon::parse('2018-02-13 20:55:12.321456')));
-        $this->assertSame(15.97078853046595, Carbon::parse('2018-02-13 20:55:12.321456')->floatDiffInMonths(Carbon::parse('2019-06-12 14:24:58.987421'), false));
-        $this->assertSame(-15.97078853046595, Carbon::parse('2019-06-12 14:24:58.987421')->floatDiffInMonths(Carbon::parse('2018-02-13 20:55:12.321456'), false));
+        $this->assertSame(15.971474250377973, Carbon::parse('2018-02-13 20:55:12.321456')->floatDiffInMonths(Carbon::parse('2019-06-12 14:24:58.987421')));
+        $this->assertSame(15.971474250377973, Carbon::parse('2019-06-12 14:24:58.987421')->floatDiffInMonths(Carbon::parse('2018-02-13 20:55:12.321456')));
+        $this->assertSame(15.971474250377973, Carbon::parse('2018-02-13 20:55:12.321456')->floatDiffInMonths(Carbon::parse('2019-06-12 14:24:58.987421'), false));
+        $this->assertSame(-15.971474250377973, Carbon::parse('2019-06-12 14:24:58.987421')->floatDiffInMonths(Carbon::parse('2018-02-13 20:55:12.321456'), false));
 
         $this->assertSame(1, Carbon::parse('2018-02-13 20:55:12.321456')->floatDiffInYears(Carbon::parse('2019-02-13 20:55:12.321456')));
-        $this->assertSame(1.3745433789954338, Carbon::parse('2018-02-13 20:55:12.321456')->floatDiffInYears(Carbon::parse('2019-06-30 14:24:58.987421')));
-        $this->assertSame(0.9608447488584474, Carbon::parse('2018-02-13 20:55:12.321456')->floatDiffInYears(Carbon::parse('2019-01-30 14:24:58.987421')));
+        $this->assertSame(1.3746000338015283, Carbon::parse('2018-02-13 20:55:12.321456')->floatDiffInYears(Carbon::parse('2019-06-30 14:24:58.987421')));
+        $this->assertSame(0.9609014036645421, Carbon::parse('2018-02-13 20:55:12.321456')->floatDiffInYears(Carbon::parse('2019-01-30 14:24:58.987421')));
 
-        $this->assertSame(1.325228310502283, Carbon::parse('2018-02-13 20:55:12.321456')->floatDiffInYears(Carbon::parse('2019-06-12 14:24:58.987421')));
-        $this->assertSame(1.325228310502283, Carbon::parse('2019-06-12 14:24:58.987421')->floatDiffInYears(Carbon::parse('2018-02-13 20:55:12.321456')));
-        $this->assertSame(1.325228310502283, Carbon::parse('2018-02-13 20:55:12.321456')->floatDiffInYears(Carbon::parse('2019-06-12 14:24:58.987421'), false));
-        $this->assertSame(-1.325228310502283, Carbon::parse('2019-06-12 14:24:58.987421')->floatDiffInYears(Carbon::parse('2018-02-13 20:55:12.321456'), false));
+        $this->assertSame(1.3252849653083778, Carbon::parse('2018-02-13 20:55:12.321456')->floatDiffInYears(Carbon::parse('2019-06-12 14:24:58.987421')));
+        $this->assertSame(1.3252849653083778, Carbon::parse('2019-06-12 14:24:58.987421')->floatDiffInYears(Carbon::parse('2018-02-13 20:55:12.321456')));
+        $this->assertSame(1.3252849653083778, Carbon::parse('2018-02-13 20:55:12.321456')->floatDiffInYears(Carbon::parse('2019-06-12 14:24:58.987421'), false));
+        $this->assertSame(-1.3252849653083778, Carbon::parse('2019-06-12 14:24:58.987421')->floatDiffInYears(Carbon::parse('2018-02-13 20:55:12.321456'), false));
 
-        $this->assertSame(5.325228310502283, Carbon::parse('2018-02-13 20:55:12.321456')->floatDiffInYears(Carbon::parse('2023-06-12 14:24:58.987421')));
-        $this->assertSame(5.325228310502283, Carbon::parse('2023-06-12 14:24:58.987421')->floatDiffInYears(Carbon::parse('2018-02-13 20:55:12.321456')));
-        $this->assertSame(5.325228310502283, Carbon::parse('2018-02-13 20:55:12.321456')->floatDiffInYears(Carbon::parse('2023-06-12 14:24:58.987421'), false));
-        $this->assertSame(-5.325228310502283, Carbon::parse('2023-06-12 14:24:58.987421')->floatDiffInYears(Carbon::parse('2018-02-13 20:55:12.321456'), false));
+        $this->assertSame(5.325284965308378, Carbon::parse('2018-02-13 20:55:12.321456')->floatDiffInYears(Carbon::parse('2023-06-12 14:24:58.987421')));
+        $this->assertSame(5.325284965308378, Carbon::parse('2023-06-12 14:24:58.987421')->floatDiffInYears(Carbon::parse('2018-02-13 20:55:12.321456')));
+        $this->assertSame(5.325284965308378, Carbon::parse('2018-02-13 20:55:12.321456')->floatDiffInYears(Carbon::parse('2023-06-12 14:24:58.987421'), false));
+        $this->assertSame(-5.325284965308378, Carbon::parse('2023-06-12 14:24:58.987421')->floatDiffInYears(Carbon::parse('2018-02-13 20:55:12.321456'), false));
 
         $this->assertSame(1, Carbon::parse('2018-10-01 00:00:00', 'Europe/Paris')->floatDiffInMonths(Carbon::parse('2018-11-01 00:00:00', 'Europe/Paris')));
         $this->assertSame(1, Carbon::parse('2018-10-28 00:00:00')->floatDiffInMonths(Carbon::parse('2018-11-28 00:00:00')));
@@ -1553,31 +1555,33 @@ public function testFloatDiffWithRealUnits()
     {
         date_default_timezone_set('UTC');
 
-        $this->assertSame(0.9707885304659498, Carbon::parse('2018-03-13 20:55:12.321456')->floatDiffInRealMonths(Carbon::parse('2018-04-12 14:24:58.987421')));
-        $this->assertSame(0.9707885304659498, Carbon::parse('2018-04-12 14:24:58.987421')->floatDiffInRealMonths(Carbon::parse('2018-03-13 20:55:12.321456')));
-        $this->assertSame(0.9707885304659498, Carbon::parse('2018-03-13 20:55:12.321456')->floatDiffInRealMonths(Carbon::parse('2018-04-12 14:24:58.987421'), false));
-        $this->assertSame(-0.9707885304659498, Carbon::parse('2018-04-12 14:24:58.987421')->floatDiffInRealMonths(Carbon::parse('2018-03-13 20:55:12.321456'), false));
+        $this->assertSame(1.0006944444444443, Carbon::parse('2018-12-01 00:00')->floatDiffInRealDays(Carbon::parse('2018-12-02 00:01')));
+
+        $this->assertSame(0.9714742503779745, Carbon::parse('2018-03-13 20:55:12.321456')->floatDiffInRealMonths(Carbon::parse('2018-04-12 14:24:58.987421')));
+        $this->assertSame(0.9714742503779745, Carbon::parse('2018-04-12 14:24:58.987421')->floatDiffInRealMonths(Carbon::parse('2018-03-13 20:55:12.321456')));
+        $this->assertSame(0.9714742503779745, Carbon::parse('2018-03-13 20:55:12.321456')->floatDiffInRealMonths(Carbon::parse('2018-04-12 14:24:58.987421'), false));
+        $this->assertSame(-0.9714742503779745, Carbon::parse('2018-04-12 14:24:58.987421')->floatDiffInRealMonths(Carbon::parse('2018-03-13 20:55:12.321456'), false));
 
-        $this->assertSame(16.556944444444444, Carbon::parse('2018-02-13 20:55:12.321456')->floatDiffInRealMonths(Carbon::parse('2019-06-30 14:24:58.987421')));
+        $this->assertSame(16.557633744585264, Carbon::parse('2018-02-13 20:55:12.321456')->floatDiffInRealMonths(Carbon::parse('2019-06-30 14:24:58.987421')));
 
-        $this->assertSame(15.97078853046595, Carbon::parse('2018-02-13 20:55:12.321456')->floatDiffInRealMonths(Carbon::parse('2019-06-12 14:24:58.987421')));
-        $this->assertSame(15.97078853046595, Carbon::parse('2019-06-12 14:24:58.987421')->floatDiffInRealMonths(Carbon::parse('2018-02-13 20:55:12.321456')));
-        $this->assertSame(15.97078853046595, Carbon::parse('2018-02-13 20:55:12.321456')->floatDiffInRealMonths(Carbon::parse('2019-06-12 14:24:58.987421'), false));
-        $this->assertSame(-15.97078853046595, Carbon::parse('2019-06-12 14:24:58.987421')->floatDiffInRealMonths(Carbon::parse('2018-02-13 20:55:12.321456'), false));
+        $this->assertSame(15.971474250377973, Carbon::parse('2018-02-13 20:55:12.321456')->floatDiffInRealMonths(Carbon::parse('2019-06-12 14:24:58.987421')));
+        $this->assertSame(15.971474250377973, Carbon::parse('2019-06-12 14:24:58.987421')->floatDiffInRealMonths(Carbon::parse('2018-02-13 20:55:12.321456')));
+        $this->assertSame(15.971474250377973, Carbon::parse('2018-02-13 20:55:12.321456')->floatDiffInRealMonths(Carbon::parse('2019-06-12 14:24:58.987421'), false));
+        $this->assertSame(-15.971474250377973, Carbon::parse('2019-06-12 14:24:58.987421')->floatDiffInRealMonths(Carbon::parse('2018-02-13 20:55:12.321456'), false));
 
         $this->assertSame(1, Carbon::parse('2018-02-13 20:55:12.321456')->floatDiffInRealYears(Carbon::parse('2019-02-13 20:55:12.321456')));
-        $this->assertSame(1.3745433789954338, Carbon::parse('2018-02-13 20:55:12.321456')->floatDiffInRealYears(Carbon::parse('2019-06-30 14:24:58.987421')));
-        $this->assertSame(0.9608447488584474, Carbon::parse('2018-02-13 20:55:12.321456')->floatDiffInRealYears(Carbon::parse('2019-01-30 14:24:58.987421')));
-
-        $this->assertSame(1.325228310502283, Carbon::parse('2018-02-13 20:55:12.321456')->floatDiffInRealYears(Carbon::parse('2019-06-12 14:24:58.987421')));
-        $this->assertSame(1.325228310502283, Carbon::parse('2019-06-12 14:24:58.987421')->floatDiffInRealYears(Carbon::parse('2018-02-13 20:55:12.321456')));
-        $this->assertSame(1.325228310502283, Carbon::parse('2018-02-13 20:55:12.321456')->floatDiffInRealYears(Carbon::parse('2019-06-12 14:24:58.987421'), false));
-        $this->assertSame(-1.325228310502283, Carbon::parse('2019-06-12 14:24:58.987421')->floatDiffInRealYears(Carbon::parse('2018-02-13 20:55:12.321456'), false));
-
-        $this->assertSame(5.325228310502283, Carbon::parse('2018-02-13 20:55:12.321456')->floatDiffInRealYears(Carbon::parse('2023-06-12 14:24:58.987421')));
-        $this->assertSame(5.325228310502283, Carbon::parse('2023-06-12 14:24:58.987421')->floatDiffInRealYears(Carbon::parse('2018-02-13 20:55:12.321456')));
-        $this->assertSame(5.325228310502283, Carbon::parse('2018-02-13 20:55:12.321456')->floatDiffInRealYears(Carbon::parse('2023-06-12 14:24:58.987421'), false));
-        $this->assertSame(-5.325228310502283, Carbon::parse('2023-06-12 14:24:58.987421')->floatDiffInRealYears(Carbon::parse('2018-02-13 20:55:12.321456'), false));
+        $this->assertSame(1.3746000338015283, Carbon::parse('2018-02-13 20:55:12.321456')->floatDiffInRealYears(Carbon::parse('2019-06-30 14:24:58.987421')));
+        $this->assertSame(0.9609014036645421, Carbon::parse('2018-02-13 20:55:12.321456')->floatDiffInRealYears(Carbon::parse('2019-01-30 14:24:58.987421')));
+
+        $this->assertSame(1.3252849653083778, Carbon::parse('2018-02-13 20:55:12.321456')->floatDiffInRealYears(Carbon::parse('2019-06-12 14:24:58.987421')));
+        $this->assertSame(1.3252849653083778, Carbon::parse('2019-06-12 14:24:58.987421')->floatDiffInRealYears(Carbon::parse('2018-02-13 20:55:12.321456')));
+        $this->assertSame(1.3252849653083778, Carbon::parse('2018-02-13 20:55:12.321456')->floatDiffInRealYears(Carbon::parse('2019-06-12 14:24:58.987421'), false));
+        $this->assertSame(-1.3252849653083778, Carbon::parse('2019-06-12 14:24:58.987421')->floatDiffInRealYears(Carbon::parse('2018-02-13 20:55:12.321456'), false));
+
+        $this->assertSame(5.325284965308378, Carbon::parse('2018-02-13 20:55:12.321456')->floatDiffInRealYears(Carbon::parse('2023-06-12 14:24:58.987421')));
+        $this->assertSame(5.325284965308378, Carbon::parse('2023-06-12 14:24:58.987421')->floatDiffInRealYears(Carbon::parse('2018-02-13 20:55:12.321456')));
+        $this->assertSame(5.325284965308378, Carbon::parse('2018-02-13 20:55:12.321456')->floatDiffInRealYears(Carbon::parse('2023-06-12 14:24:58.987421'), false));
+        $this->assertSame(-5.325284965308378, Carbon::parse('2023-06-12 14:24:58.987421')->floatDiffInRealYears(Carbon::parse('2018-02-13 20:55:12.321456'), false));
 
         $this->assertSame(1, Carbon::parse('2018-10-01 00:00:00', 'Europe/Paris')->floatDiffInRealMonths(Carbon::parse('2018-11-01 00:00:00', 'Europe/Paris')));
         $this->assertSame(1, Carbon::parse('2018-10-28 00:00:00')->floatDiffInRealMonths(Carbon::parse('2018-11-28 00:00:00')));
diff --git a/tests/CarbonImmutable/DiffTest.php b/tests/CarbonImmutable/DiffTest.php
index ac27fdfb08..a643cbb39b 100644
--- a/tests/CarbonImmutable/DiffTest.php
+++ b/tests/CarbonImmutable/DiffTest.php
@@ -1462,31 +1462,33 @@ public function testFloatDiff()
 
         $this->assertSame(8986.665965, Carbon::parse('2018-03-31 23:55:12.321456')->floatDiffInSeconds(Carbon::parse('2018-04-01 02:24:58.987421')));
 
-        $this->assertSame(0.9707885304659498, Carbon::parse('2018-03-13 20:55:12.321456')->floatDiffInMonths(Carbon::parse('2018-04-12 14:24:58.987421')));
-        $this->assertSame(0.9707885304659498, Carbon::parse('2018-04-12 14:24:58.987421')->floatDiffInMonths(Carbon::parse('2018-03-13 20:55:12.321456')));
-        $this->assertSame(0.9707885304659498, Carbon::parse('2018-03-13 20:55:12.321456')->floatDiffInMonths(Carbon::parse('2018-04-12 14:24:58.987421'), false));
-        $this->assertSame(-0.9707885304659498, Carbon::parse('2018-04-12 14:24:58.987421')->floatDiffInMonths(Carbon::parse('2018-03-13 20:55:12.321456'), false));
+        $this->assertSame(1.0006944444444443, Carbon::parse('2018-12-01 00:00')->floatDiffInDays(Carbon::parse('2018-12-02 00:01')));
 
-        $this->assertSame(16.556944444444444, Carbon::parse('2018-02-13 20:55:12.321456')->floatDiffInMonths(Carbon::parse('2019-06-30 14:24:58.987421')));
+        $this->assertSame(0.9714742503779745, Carbon::parse('2018-03-13 20:55:12.321456')->floatDiffInMonths(Carbon::parse('2018-04-12 14:24:58.987421')));
+        $this->assertSame(0.9714742503779745, Carbon::parse('2018-04-12 14:24:58.987421')->floatDiffInMonths(Carbon::parse('2018-03-13 20:55:12.321456')));
+        $this->assertSame(0.9714742503779745, Carbon::parse('2018-03-13 20:55:12.321456')->floatDiffInMonths(Carbon::parse('2018-04-12 14:24:58.987421'), false));
+        $this->assertSame(-0.9714742503779745, Carbon::parse('2018-04-12 14:24:58.987421')->floatDiffInMonths(Carbon::parse('2018-03-13 20:55:12.321456'), false));
 
-        $this->assertSame(15.97078853046595, Carbon::parse('2018-02-13 20:55:12.321456')->floatDiffInMonths(Carbon::parse('2019-06-12 14:24:58.987421')));
-        $this->assertSame(15.97078853046595, Carbon::parse('2019-06-12 14:24:58.987421')->floatDiffInMonths(Carbon::parse('2018-02-13 20:55:12.321456')));
-        $this->assertSame(15.97078853046595, Carbon::parse('2018-02-13 20:55:12.321456')->floatDiffInMonths(Carbon::parse('2019-06-12 14:24:58.987421'), false));
-        $this->assertSame(-15.97078853046595, Carbon::parse('2019-06-12 14:24:58.987421')->floatDiffInMonths(Carbon::parse('2018-02-13 20:55:12.321456'), false));
+        $this->assertSame(16.557633744585264, Carbon::parse('2018-02-13 20:55:12.321456')->floatDiffInMonths(Carbon::parse('2019-06-30 14:24:58.987421')));
+
+        $this->assertSame(15.971474250377973, Carbon::parse('2018-02-13 20:55:12.321456')->floatDiffInMonths(Carbon::parse('2019-06-12 14:24:58.987421')));
+        $this->assertSame(15.971474250377973, Carbon::parse('2019-06-12 14:24:58.987421')->floatDiffInMonths(Carbon::parse('2018-02-13 20:55:12.321456')));
+        $this->assertSame(15.971474250377973, Carbon::parse('2018-02-13 20:55:12.321456')->floatDiffInMonths(Carbon::parse('2019-06-12 14:24:58.987421'), false));
+        $this->assertSame(-15.971474250377973, Carbon::parse('2019-06-12 14:24:58.987421')->floatDiffInMonths(Carbon::parse('2018-02-13 20:55:12.321456'), false));
 
         $this->assertSame(1, Carbon::parse('2018-02-13 20:55:12.321456')->floatDiffInYears(Carbon::parse('2019-02-13 20:55:12.321456')));
-        $this->assertSame(1.3745433789954338, Carbon::parse('2018-02-13 20:55:12.321456')->floatDiffInYears(Carbon::parse('2019-06-30 14:24:58.987421')));
-        $this->assertSame(0.9608447488584474, Carbon::parse('2018-02-13 20:55:12.321456')->floatDiffInYears(Carbon::parse('2019-01-30 14:24:58.987421')));
+        $this->assertSame(1.3746000338015283, Carbon::parse('2018-02-13 20:55:12.321456')->floatDiffInYears(Carbon::parse('2019-06-30 14:24:58.987421')));
+        $this->assertSame(0.9609014036645421, Carbon::parse('2018-02-13 20:55:12.321456')->floatDiffInYears(Carbon::parse('2019-01-30 14:24:58.987421')));
 
-        $this->assertSame(1.325228310502283, Carbon::parse('2018-02-13 20:55:12.321456')->floatDiffInYears(Carbon::parse('2019-06-12 14:24:58.987421')));
-        $this->assertSame(1.325228310502283, Carbon::parse('2019-06-12 14:24:58.987421')->floatDiffInYears(Carbon::parse('2018-02-13 20:55:12.321456')));
-        $this->assertSame(1.325228310502283, Carbon::parse('2018-02-13 20:55:12.321456')->floatDiffInYears(Carbon::parse('2019-06-12 14:24:58.987421'), false));
-        $this->assertSame(-1.325228310502283, Carbon::parse('2019-06-12 14:24:58.987421')->floatDiffInYears(Carbon::parse('2018-02-13 20:55:12.321456'), false));
+        $this->assertSame(1.3252849653083778, Carbon::parse('2018-02-13 20:55:12.321456')->floatDiffInYears(Carbon::parse('2019-06-12 14:24:58.987421')));
+        $this->assertSame(1.3252849653083778, Carbon::parse('2019-06-12 14:24:58.987421')->floatDiffInYears(Carbon::parse('2018-02-13 20:55:12.321456')));
+        $this->assertSame(1.3252849653083778, Carbon::parse('2018-02-13 20:55:12.321456')->floatDiffInYears(Carbon::parse('2019-06-12 14:24:58.987421'), false));
+        $this->assertSame(-1.3252849653083778, Carbon::parse('2019-06-12 14:24:58.987421')->floatDiffInYears(Carbon::parse('2018-02-13 20:55:12.321456'), false));
 
-        $this->assertSame(5.325228310502283, Carbon::parse('2018-02-13 20:55:12.321456')->floatDiffInYears(Carbon::parse('2023-06-12 14:24:58.987421')));
-        $this->assertSame(5.325228310502283, Carbon::parse('2023-06-12 14:24:58.987421')->floatDiffInYears(Carbon::parse('2018-02-13 20:55:12.321456')));
-        $this->assertSame(5.325228310502283, Carbon::parse('2018-02-13 20:55:12.321456')->floatDiffInYears(Carbon::parse('2023-06-12 14:24:58.987421'), false));
-        $this->assertSame(-5.325228310502283, Carbon::parse('2023-06-12 14:24:58.987421')->floatDiffInYears(Carbon::parse('2018-02-13 20:55:12.321456'), false));
+        $this->assertSame(5.325284965308378, Carbon::parse('2018-02-13 20:55:12.321456')->floatDiffInYears(Carbon::parse('2023-06-12 14:24:58.987421')));
+        $this->assertSame(5.325284965308378, Carbon::parse('2023-06-12 14:24:58.987421')->floatDiffInYears(Carbon::parse('2018-02-13 20:55:12.321456')));
+        $this->assertSame(5.325284965308378, Carbon::parse('2018-02-13 20:55:12.321456')->floatDiffInYears(Carbon::parse('2023-06-12 14:24:58.987421'), false));
+        $this->assertSame(-5.325284965308378, Carbon::parse('2023-06-12 14:24:58.987421')->floatDiffInYears(Carbon::parse('2018-02-13 20:55:12.321456'), false));
 
         $this->assertSame(1, Carbon::parse('2018-10-01 00:00:00', 'Europe/Paris')->floatDiffInMonths(Carbon::parse('2018-11-01 00:00:00', 'Europe/Paris')));
         $this->assertSame(1, Carbon::parse('2018-10-28 00:00:00')->floatDiffInMonths(Carbon::parse('2018-11-28 00:00:00')));
@@ -1501,31 +1503,33 @@ public function testFloatDiffWithRealUnits()
     {
         date_default_timezone_set('UTC');
 
-        $this->assertSame(0.9707885304659498, Carbon::parse('2018-03-13 20:55:12.321456')->floatDiffInRealMonths(Carbon::parse('2018-04-12 14:24:58.987421')));
-        $this->assertSame(0.9707885304659498, Carbon::parse('2018-04-12 14:24:58.987421')->floatDiffInRealMonths(Carbon::parse('2018-03-13 20:55:12.321456')));
-        $this->assertSame(0.9707885304659498, Carbon::parse('2018-03-13 20:55:12.321456')->floatDiffInRealMonths(Carbon::parse('2018-04-12 14:24:58.987421'), false));
-        $this->assertSame(-0.9707885304659498, Carbon::parse('2018-04-12 14:24:58.987421')->floatDiffInRealMonths(Carbon::parse('2018-03-13 20:55:12.321456'), false));
+        $this->assertSame(1.0006944444444443, Carbon::parse('2018-12-01 00:00')->floatDiffInRealDays(Carbon::parse('2018-12-02 00:01')));
+
+        $this->assertSame(0.9714742503779745, Carbon::parse('2018-03-13 20:55:12.321456')->floatDiffInRealMonths(Carbon::parse('2018-04-12 14:24:58.987421')));
+        $this->assertSame(0.9714742503779745, Carbon::parse('2018-04-12 14:24:58.987421')->floatDiffInRealMonths(Carbon::parse('2018-03-13 20:55:12.321456')));
+        $this->assertSame(0.9714742503779745, Carbon::parse('2018-03-13 20:55:12.321456')->floatDiffInRealMonths(Carbon::parse('2018-04-12 14:24:58.987421'), false));
+        $this->assertSame(-0.9714742503779745, Carbon::parse('2018-04-12 14:24:58.987421')->floatDiffInRealMonths(Carbon::parse('2018-03-13 20:55:12.321456'), false));
 
-        $this->assertSame(16.556944444444444, Carbon::parse('2018-02-13 20:55:12.321456')->floatDiffInRealMonths(Carbon::parse('2019-06-30 14:24:58.987421')));
+        $this->assertSame(16.557633744585264, Carbon::parse('2018-02-13 20:55:12.321456')->floatDiffInRealMonths(Carbon::parse('2019-06-30 14:24:58.987421')));
 
-        $this->assertSame(15.97078853046595, Carbon::parse('2018-02-13 20:55:12.321456')->floatDiffInRealMonths(Carbon::parse('2019-06-12 14:24:58.987421')));
-        $this->assertSame(15.97078853046595, Carbon::parse('2019-06-12 14:24:58.987421')->floatDiffInRealMonths(Carbon::parse('2018-02-13 20:55:12.321456')));
-        $this->assertSame(15.97078853046595, Carbon::parse('2018-02-13 20:55:12.321456')->floatDiffInRealMonths(Carbon::parse('2019-06-12 14:24:58.987421'), false));
-        $this->assertSame(-15.97078853046595, Carbon::parse('2019-06-12 14:24:58.987421')->floatDiffInRealMonths(Carbon::parse('2018-02-13 20:55:12.321456'), false));
+        $this->assertSame(15.971474250377973, Carbon::parse('2018-02-13 20:55:12.321456')->floatDiffInRealMonths(Carbon::parse('2019-06-12 14:24:58.987421')));
+        $this->assertSame(15.971474250377973, Carbon::parse('2019-06-12 14:24:58.987421')->floatDiffInRealMonths(Carbon::parse('2018-02-13 20:55:12.321456')));
+        $this->assertSame(15.971474250377973, Carbon::parse('2018-02-13 20:55:12.321456')->floatDiffInRealMonths(Carbon::parse('2019-06-12 14:24:58.987421'), false));
+        $this->assertSame(-15.971474250377973, Carbon::parse('2019-06-12 14:24:58.987421')->floatDiffInRealMonths(Carbon::parse('2018-02-13 20:55:12.321456'), false));
 
         $this->assertSame(1, Carbon::parse('2018-02-13 20:55:12.321456')->floatDiffInRealYears(Carbon::parse('2019-02-13 20:55:12.321456')));
-        $this->assertSame(1.3745433789954338, Carbon::parse('2018-02-13 20:55:12.321456')->floatDiffInRealYears(Carbon::parse('2019-06-30 14:24:58.987421')));
-        $this->assertSame(0.9608447488584474, Carbon::parse('2018-02-13 20:55:12.321456')->floatDiffInRealYears(Carbon::parse('2019-01-30 14:24:58.987421')));
-
-        $this->assertSame(1.325228310502283, Carbon::parse('2018-02-13 20:55:12.321456')->floatDiffInRealYears(Carbon::parse('2019-06-12 14:24:58.987421')));
-        $this->assertSame(1.325228310502283, Carbon::parse('2019-06-12 14:24:58.987421')->floatDiffInRealYears(Carbon::parse('2018-02-13 20:55:12.321456')));
-        $this->assertSame(1.325228310502283, Carbon::parse('2018-02-13 20:55:12.321456')->floatDiffInRealYears(Carbon::parse('2019-06-12 14:24:58.987421'), false));
-        $this->assertSame(-1.325228310502283, Carbon::parse('2019-06-12 14:24:58.987421')->floatDiffInRealYears(Carbon::parse('2018-02-13 20:55:12.321456'), false));
-
-        $this->assertSame(5.325228310502283, Carbon::parse('2018-02-13 20:55:12.321456')->floatDiffInRealYears(Carbon::parse('2023-06-12 14:24:58.987421')));
-        $this->assertSame(5.325228310502283, Carbon::parse('2023-06-12 14:24:58.987421')->floatDiffInRealYears(Carbon::parse('2018-02-13 20:55:12.321456')));
-        $this->assertSame(5.325228310502283, Carbon::parse('2018-02-13 20:55:12.321456')->floatDiffInRealYears(Carbon::parse('2023-06-12 14:24:58.987421'), false));
-        $this->assertSame(-5.325228310502283, Carbon::parse('2023-06-12 14:24:58.987421')->floatDiffInRealYears(Carbon::parse('2018-02-13 20:55:12.321456'), false));
+        $this->assertSame(1.3746000338015283, Carbon::parse('2018-02-13 20:55:12.321456')->floatDiffInRealYears(Carbon::parse('2019-06-30 14:24:58.987421')));
+        $this->assertSame(0.9609014036645421, Carbon::parse('2018-02-13 20:55:12.321456')->floatDiffInRealYears(Carbon::parse('2019-01-30 14:24:58.987421')));
+
+        $this->assertSame(1.3252849653083778, Carbon::parse('2018-02-13 20:55:12.321456')->floatDiffInRealYears(Carbon::parse('2019-06-12 14:24:58.987421')));
+        $this->assertSame(1.3252849653083778, Carbon::parse('2019-06-12 14:24:58.987421')->floatDiffInRealYears(Carbon::parse('2018-02-13 20:55:12.321456')));
+        $this->assertSame(1.3252849653083778, Carbon::parse('2018-02-13 20:55:12.321456')->floatDiffInRealYears(Carbon::parse('2019-06-12 14:24:58.987421'), false));
+        $this->assertSame(-1.3252849653083778, Carbon::parse('2019-06-12 14:24:58.987421')->floatDiffInRealYears(Carbon::parse('2018-02-13 20:55:12.321456'), false));
+
+        $this->assertSame(5.325284965308378, Carbon::parse('2018-02-13 20:55:12.321456')->floatDiffInRealYears(Carbon::parse('2023-06-12 14:24:58.987421')));
+        $this->assertSame(5.325284965308378, Carbon::parse('2023-06-12 14:24:58.987421')->floatDiffInRealYears(Carbon::parse('2018-02-13 20:55:12.321456')));
+        $this->assertSame(5.325284965308378, Carbon::parse('2018-02-13 20:55:12.321456')->floatDiffInRealYears(Carbon::parse('2023-06-12 14:24:58.987421'), false));
+        $this->assertSame(-5.325284965308378, Carbon::parse('2023-06-12 14:24:58.987421')->floatDiffInRealYears(Carbon::parse('2018-02-13 20:55:12.321456'), false));
 
         $this->assertSame(1, Carbon::parse('2018-10-01 00:00:00', 'Europe/Paris')->floatDiffInRealMonths(Carbon::parse('2018-11-01 00:00:00', 'Europe/Paris')));
         $this->assertSame(1, Carbon::parse('2018-10-28 00:00:00')->floatDiffInRealMonths(Carbon::parse('2018-11-28 00:00:00')));