The reason why my girlfriend and mother disagree is that my date of birth will interfere with my girlfriend's father. What should I do?

Your girlfriend's parents are too feudal. . . So is your girlfriend. She listens to her parents too much and is a little confused. Well, this old feudal concept is hard to change, but you can start with your parents' preferences and spend more time with them, or let them chat with them intentionally or unintentionally to let them know more about you. Although your parents are old, they are worthy of our filial piety.