Angular to Django - 'Unknown string format:'

I am building a front end using Angular where the user selects a file and a date (using a date picker). This is then sent to django using the django_rest_framework to to a standalone class that uploads this file onto an oracle database using sqlalchemy.

The uploading page use to work fine when it was created on a Django template, however I need to migrate this to angular and when i pass the file and date parameters i get an error:

Error: ('Unknown string format:', 'Tue Dec 07 2021 00:00:00 GMT+0000 (Greenwich Mean Time)')

Where Tue Dec 07 2021 00:00:00 GMT+0000 (Greenwich Mean Time) represents the date chosen from the datepicker.

Anyone know why this is happening?

views.py

@api_view(('POST',))
@csrf_exempt
def uploader(request):
    if request.method == 'POST':
        try:
            instance= uploader(request.FILES['data'], request.POST['selectedDate'])
            _ = upload_instance.run_upload_process('data')
            upload_message = "Success"
            return Response(upload_message, status=status.HTTP_201_CREATED)
        except Exception as e:
            upload_message = 'Error: ' + str(e)
            return Response(upload_message, status=status.HTTP_400_BAD_REQUEST

upload.component.ts

  onFileChange (event:any) {
    this.filetoUpload = event.target.files[0];
  }

  inputEvent(event:any) {
    this.monthEndDate = event.value;
  }

  newUpload() {
    const uploadData = new FormData();
    uploadData.append('data', this.filetoUpload, this.filetoUpload.name);
    uploadData.append('selectedDate', this.monthEndDate)
    this.http.post('http://127.0.0.1:8000/upload/', uploadData).subscribe(
      data => console.log(data),
      error => console.log(error)
    );
  }

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