John is an American boy. His family is in China now. John likes chocolate very much. But his mother doesn't give him. Chocolate is not good for him, she thinks. But John has a very nice uncle. The old man loves him very much, and sometimes he buys John some chocolate.  Then his mother lets him eat them. Because she wants to make the old man happy. One Sunday evening, John says in his room," Please, God   makes them give me a big box of chocolate tomorrow , it's my eighth birthday!" His mother says to him , "God can't hear  you, my boy." "I know, but my uncle is in the next  room, and he can hear." John says to his mother. What day is John's birthday according to the passage ?
Sunday Monday Tuesday Saturday