Last Day

3 yr old: Last day is my birthday.
Me: What is last day?
3 yr old: Last day was my birthday.
Me: Oh, ‘last day’ is any day before today. Got it. Like yesterday. Last week, last month. How brilliant, last day means last day.
Me: What do you call tomorrow?
3 yr old: (silence and stare)
Me: Must be ‘next day’.