两个都是是正确的.
What day is it tomorrow?和What's the day tomorrow?都是问：明天是星期几?
what day is it tomorrow?=What is the day tomorrow?
What is the day tomorrow?比较少用.
what's tha date today?就是问：今天是几号?有一道题：不写出下列答句的问句。 Tomorrow is Sunday.多数是用what day is it tomorrow？ Tomorrow is Sunday.