Change dateDifference() to date_difference()

app/Entities/Projects/Project.php

@@ -234,12 +234,12 @@ class Project extends Model
             return '-';
         }
 
-        $workDuration = dateDifference($startDate, $endDate);
+        $workDuration = date_difference($startDate, $endDate);
 
         if ((int) $workDuration > 365) {
-            return dateDifference($startDate, $endDate, '%y Year(s) %m Month(s)');
+            return date_difference($startDate, $endDate, '%y Year(s) %m Month(s)');
         } elseif ((int) $workDuration > 30) {
-            return dateDifference($startDate, $endDate, '%m Month(s) %d Day(s)');
+            return date_difference($startDate, $endDate, '%m Month(s) %d Day(s)');
         }
 
         return $workDuration.' Day(s)';

app/helpers.php

@@ -195,7 +195,7 @@ function html_link_to_route($name, $title = null, $parameters = [], $attributes
  * @param  string  $differenceFormat
  * @return int|string
  */
-function dateDifference($date1, $date2, $differenceFormat = '%a')
+function date_difference($date1, $date2, $differenceFormat = '%a')
 {
     $datetime1 = date_create($date1);
     $datetime2 = date_create($date2);

tests/Unit/Helpers/DateDifferenceTest.php

@@ -14,31 +14,31 @@ class DateDifferenceTest extends TestCase
     /** @test */
     public function date_difference_function_exists()
     {
-        $this->assertTrue(function_exists('dateDifference'));
+        $this->assertTrue(function_exists('date_difference'));
     }
 
     /** @test */
     public function date_difference_returns_days_count_by_default()
     {
-        $this->assertEquals(9, dateDifference('2018-04-01', '2018-04-10'));
+        $this->assertEquals(9, date_difference('2018-04-01', '2018-04-10'));
     }
 
     /** @test */
     public function date_difference_can_returns_formatted_string()
     {
-        $this->assertEquals('9 days', dateDifference('2018-04-01', '2018-04-10', '%a days'));
+        $this->assertEquals('9 days', date_difference('2018-04-01', '2018-04-10', '%a days'));
     }
 
     /** @test */
     public function date_difference_returns_proper_months_and_days_format()
     {
         // TODO: Need to fix, this should returns 1 months 9 days
-        $this->assertEquals('1 month 12 days', dateDifference('2018-03-01', '2018-04-10', '%m month %d days'));
+        $this->assertEquals('1 month 12 days', date_difference('2018-03-01', '2018-04-10', '%m month %d days'));
     }
 
     /** @test */
     public function date_difference_returns_proper_years_months_and_days_format()
     {
-        $this->assertEquals('1 year 1 month 12 days', dateDifference('2017-03-01', '2018-04-10', '%y year %m month %d days'));
+        $this->assertEquals('1 year 1 month 12 days', date_difference('2017-03-01', '2018-04-10', '%y year %m month %d days'));
     }
 }