Commit although could not run on localhost

app/Http/Controllers/Announcement/PostAnnouncementController.php

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+<?php
+
+namespace App\Http\Controllers\Announcement;//call to announcement controller folder
+use App\Http\Controllers\Controller;//call to controller class
+
+use App\Http\Helpers\ConvertDateToTimeStamp;//call to convert datastampclass
+use App\Models\Announcement;//call to model class
+use Illuminate\Http\Request;//call to laravel request
+use Carbon\Carbon;
+
+class PostAnnouncementController extends Controller
+{
+    /**
+     * Store a newly created resource in storage.
+     *
+     * @param  \Illuminate\Http\Request  $request
+     * @return \Illuminate\Http\Response
+     */
+    public function store(Request $request)
+    {
+        //validate field name in Form/view
+        $this->validate($request, [
+            'startdate' => 'required',
+            'enddate' => 'required',
+            'content' => 'required'
+        ]);
+
+        // create class objects
+        $announcement = new Announcement();
+        $convertdate = new ConvertDateToTimeStamp();
+
+        //On left field name in DB and on right field name in Form/view
+//        $announcement->posted_by = $request->input('name');
+        $announcement->start_date = $convertdate::convertDateToTimeStamp($request->input('startdate'));
+        $announcement->end_date = $convertdate::convertDateToTimeStamp($request->input('enddate'));
+        $announcement->content = $request->input('content');
+        $saved = $announcement->save();
+
+        if($saved)
+        {
+            session()->put('success', 'Announcement Successfully Created!');
+            return redirect()->back();
+        }
+        //the else part
+        session()->put('error', 'There was an error creating this announcement!');
+        return redirect()->back();
+
+    }
+
+}