一道英语智力题

题目

一道英语智力题
My friend,Tom,says “ I was 12 years old two days ago.but I'll be 15 years old next year.Through his words. we can know Tom's birthday is on_______.请帮忙解释答案是多少,为什么谢谢

答案

12.30
去年的12.30他12岁,过了元旦13岁,明年14岁,虚岁15岁