我创建了一个更新表单，该表单有2个时间字段和2个日期时间字段，一旦点击提交，即使没有任何变化，我得到了一个错误“'datetime.datetime'对象没有属性'strip'”。但在为同一模型创建新对象时没有错误。modles：

time_start=models.DateTimeField(blank=True,null=True)
htime_start=models.TimeField(blank=True,null=True)
time_end = models.DateTimeField(blank=True, null=True)
htime_end=models.TimeField(blank=True,null=True)
time_require=models.DateTimeField(blank=True,null=True)
machine=models.ForeignKey(Machine,null=True, on_delete=models.SET_NULL, blank=True)

表格：

class AssignTimeForProjects(forms.ModelForm):
title = forms.CharField(disabled=True)
owner=forms.CharField(disabled=True)
time_require=forms.TimeField(disabled=True)
class Meta:
    model = tb_order
    # fields='__all__'
    fields = ['title', 'owner', 'grade', 'quantity',
              'time_require','htime_start','color',
              'mould','time_start','time_end', 'htime_end' ,'machine']

def __init__(self, *args, **kwargs):
    super(AssignTimeForProjects, self).__init__(*args, **kwargs)
    self.fields["time_end"] = JalaliDateField(label=('تاریخ اتمام'), widget=(AdminJalaliDateWidget))
    self.fields["time_start"] = JalaliDateField(label=('تاریخ شروع'), widget=(AdminJalaliDateWidget))

HTML：

<label>{{ form.htime_start.label}}</label>
                {% render_field form.htime_start  type="time"  class+="form-control timepicker" autocomplete="off" %}
                <br>
                <label>{{ form.time_end.label}}</label>
                {% render_field form.time_end  class+="form-control" autocomplete="off" %}
                <br>
                <label>{{ form.htime_end.label}}</label>
                {% render_field form.htime_end  type="time"  class+="form-control" autocomplete="off" %}