this will help The admin system uses a default ModelForm for editing the objects. You'll need to provide a custom form so that you can begin overriding field behaviour. Inside your modelform, override the field using a DateField, and use the input_formats option.
MY_DATE_FORMATS = ['%d/%m/%Y',]
date = forms.DateField(input_formats=MY_DATE_FORMATS)
model = MyModel
form = MyModelForm
Compare date value obtained from TextBox in Windows Form, to Date value stored in Excel sheet