Doctor Carl was a very busy man. He always worked hard. He often forgot his families' birthdays. Yesterday afternoon he remembered  it was his wife's   birthday. He loved his wife. He wanted to give her a present. On his way home from hospital, he bought some beautiful flowers in a shop. When doctor Carl got home, he gave his wife the flowers and said, "Happy birthday to you, dear!" "It's April 20th today. I remembered your birthday this year." Mrs. Carl laughed and said, "My birthday was the day before yesterday, but thank you all the same. Better late than never!" What date is Carl's wife's birthday?
Today. The day before yesterday. April 20th. April 18th.