INA-5 | New way of setting next scheduled run date

app/Jobs/Ninja/TaskScheduler.php

@@ -111,31 +111,10 @@ class TaskScheduler implements ShouldQueue
 
         }
 
-        $amount_of_days_until_next_run = $this->getAmountOfDays($scheduler->repeat_every);
+        $scheduler->scheduled_run = $scheduler->nextScheduledDate();
-        $scheduler->scheduled_run = Carbon::now()->addDays($amount_of_days_until_next_run);
         $scheduler->save();
     }
 
-    private function getAmountOfDays(string $repeat_every): int
-    {
-        switch ($repeat_every) {
-            case Scheduler::DAILY:
-                return 1;
-                break;
-            case Scheduler::MONTHLY:
-                return 30;
-                break;
-            case Scheduler::WEEKLY:
-                return 7;
-                break;
-            case Scheduler::QUARTERLY:
-                return 90;
-                break;
-            case Scheduler::ANNUALLY:
-                return 365;
-                break;
-        }
-    }
 
     private function fetchJobs()
     {

app/Models/Scheduler.php

@@ -14,6 +14,7 @@ namespace App\Models;
 use App\Services\TaskScheduler\TaskSchedulerService;
 use Illuminate\Database\Eloquent\Factories\HasFactory;
 use Illuminate\Database\Eloquent\Model;
+use Illuminate\Support\Carbon;
 
 /**
  * @property boolean paused
@@ -61,4 +62,29 @@ class Scheduler extends Model
     {
         return $this->hasOne(ScheduledJob::class, 'scheduler_id', 'id');
     }
+
+    public function nextScheduledDate() :?Carbon
+    {
+
+        /*
+        As we are firing at UTC+0 if our offset is negative it is technically firing the day before so we always need
+        to add ON a day - a day = 86400 seconds
+        */
+            $offset = 86400;
+
+        switch ($this->repeat_every) {
+            case self::DAILY:
+                return Carbon::parse($this->scheduled_run)->startOfDay()->addDay()->addSeconds($offset);
+            case self::WEEKLY:
+                return Carbon::parse($this->scheduled_run)->startOfDay()->addWeek()->addSeconds($offset);
+            case self::MONTHLY:
+                return Carbon::parse($this->scheduled_run)->startOfDay()->addMonth()->addSeconds($offset);
+            case self::QUARTERLY:
+                return Carbon::parse($this->scheduled_run)->startOfDay()->addMonths(3)->addSeconds($offset);
+            case self::ANNUALLY:
+                return Carbon::parse($this->scheduled_run)->startOfDay()->addYear()->addSeconds($offset);
+            default:
+                return null;
+        }
+    }
 }