in the model, I have two fields like
from_date = models.DateField()
to_date = models.DateField()
in the forms i have defined it as
widgets =  {
            'from_date' : DateInput(attrs={'class': 'datepicker'}),
            'to_date' : DateInput(attrs={'class': 'datepicker'}),
           }
in the base html, I have written the jQuery code for datepicker as
<script>
    $(document).ready(function() {
        $('.datepicker').datepicker(
          {
            minDate : 0,
            beforeShowDay : $.datepicker.noWeekends
          }
        );
    });
    </script>
I have zero knowledge in javascript and jQuery, all I want to implement is 
to_date should be always greater than from_date. How do I do that?
my model
class Leave(models.Model):
    employee_ID = models.CharField(max_length = 20)
    name = models.CharField(max_length = 50)
    user = models.ForeignKey(User, on_delete = models.CASCADE, null =True)
    department = models.CharField(max_length = 50, choices = DEPARTMENT_CHOICES)
    designation = models.CharField(max_length = 50, choices = DESIGNATION_CHOICES)
    type_of_leave = models.CharField(max_length = 15, choices = CHOICES)
    from_date = models.DateField()
    to_date = models.DateField()
    reporting_manager = models.CharField(max_length = 50, choices = MANAGER_CHOICES)
    reason = models.CharField(max_length= 180)
    status = models.CharField(max_length = 15, choices = STATUS_CHOICES)
    reason_reject = models.CharField(('reason for rejection'),max_length=50, default = '-') #blank=True)
    created = models.DateField(auto_now_add=True, editable=False, null=False, blank=False)
    last_modified = models.DateField(auto_now=True, editable=False, null=False, blank=False)
    def __str__(self):
        return self.name
my forms.py
class LeaveRequestForm(ModelForm):
class Meta:
    fields = ("name", "employee_ID" ,"department", "designation", "type_of_leave", "from_date", "to_date", "reporting_manager", "reason")
    model = Leave
    widgets =  {
        'name': Textarea(attrs = {'cols' : 20, 'rows': 1}),
        'employee_ID' : Textarea(attrs = {'cols' : 20, 'rows': 1}),
        'from_date' : DateInput(attrs={'class': 'datepicker'}),
        'to_date' : DateInput(attrs={'class': 'datepicker'}),
        'reason_reject' : forms.HiddenInput()
    }
 
     
    