from lxml import etree, objectify import sys import Users from datetime import datetime customer1 = Users.Customer(first_name="Joshua", last_name="Chang", date_of_birth=datetime(month=4, day=16, year=2021), email='*****@*****.**') print(customer1.date_of_birth) tree = etree.parse("Users.xml") print(etree.tostring(tree, pretty_print=True))