Fix off by one errors in diffFiltered

Remove the workaround as it is causing #445.

Author: markstory

src/Traits/DifferenceTrait.php

@@ -182,12 +182,6 @@ public function diffFiltered(
             $end = $this;
             $inverse = true;
         }
-        // Hack around DatePeriod not including end values.
-        // When handling dates we need to convert to a DateTime
-        // and offset by 1 second.
-        if ($end instanceof ChronosDate) {
-            $end = (new Chronos($end))->modify('+1 second');
-        }
 
         $period = new DatePeriod($start, $ci, $end);
         $vals = array_filter(iterator_to_array($period), function (DateTimeInterface $date) use ($callback) {

tests/TestCase/Date/DiffTest.php

@@ -271,7 +271,7 @@ public function testDiffFilteredNegativeWithSignWithSecondObject($class)
      */
     public function testBug188DiffWithSameDates($class)
     {
-        $start = $class::create(2014, 10, 8, 15, 20, 0);
+        $start = $class::create(2014, 10, 8);
         $end = clone $start;
 
         $this->assertSame(0, $start->diffInDays($end));
@@ -284,20 +284,33 @@ public function testBug188DiffWithSameDates($class)
      */
     public function testBug188DiffWithSameDates1DayApart($class)
     {
-        $start = $class::create(2014, 10, 8, 15, 20, 0);
+        $start = $class::create(2014, 10, 8);
         $end = (clone $start)->addDays(1);
 
         $this->assertSame(1, $start->diffInDays($end));
         $this->assertSame(1, $start->diffInWeekdays($end));
     }
 
+    /**
+     * @dataProvider dateClassProvider
+     * @return void
+     */
+    public function testDiffInDaysTwoWeeks($class)
+    {
+        $start = $class::create(2014, 10, 8);
+        for ($i = 1; $i <= 14; $i++) {
+            $end = (clone $start)->addDays($i);
+            $this->assertSame($i, $start->diffInDays($end));
+        }
+    }
+
     /**
      * @dataProvider dateClassProvider
      * @return void
      */
     public function testBug188DiffWithDatesOnTheWeekend($class)
     {
-        $start = $class::create(2014, 1, 1, 0, 0, 0);
+        $start = $class::create(2014, 1, 1);
         $start = $start->next($class::SATURDAY);
         $end = (clone $start)->addDays(1);