Django - Date problem in CRUD application

Question

I'm using flatpickr for date informations in my Django application. The problem is when I want to update worker informations, in edit.html page default value of birth_date is not displaying correctly. For example, I've created worker Xen who was born in 01-05-1997, and click to update his name, in birth_date input it displays today's date. Here are my codes:

forms.py

class WorkerForm(ModelForm):  
    class Meta:  
        model = Worker  
        fields = "__all__"  
        widgets = {
            'birth_date': DateTimeInput(format='%Y-%m-%d %H:%M:%S', attrs={'class':'datetimefield'})
        }   

models.py:

class Worker(models.Model):
    ...
    birth_date = models.DateTimeField(blank=True, null=True)

edit.html:

...
<div class="form-group row">
  <label class="col-sm-2 col-form-label">İşçinin doğum tarixi</label>
  <div class="col-sm-4">
    <input class="datetimefield" type="date" name="birth_date" id="birth_date" value="{{ worker.birth_date }}" />
  </div>
</div>
...
    <script>
        window.addEventListener("DOMContentLoaded", function () {
            flatpickr(".datetimefield", {
                enableTime: true,
                enableSeconds: true,
                dateFormat: "Y-m-d H:i:S",
                time_24hr: true,
                locale: "az",
            });
        });
    </script>

Answer 1

I've changed last line of script according to @Melvyn answer:

defaultDate: `worker.birth_date.strftime()`