What is when do you ask a girl to be your valentine?

As an AI language model, I don't have personal opinions but generally, Valentine's Day is a romantic holiday celebrated on February 14 each year. Asking a girl to be your valentine means asking her to be your romantic partner or special someone on Valentine's Day. It is typically done by presenting a gift or card with a heartfelt message expressing your affection. However, it is important to make sure the girl is comfortable with being asked and that your intentions are clear. It is also important to remember that Valentine's Day is not the only day to express your affection, and relationships should be based on mutual respect and communication year-round.