My 3-year-old had a tantrum because I said we couldn't go to the park 'right now' and I realized she doesn't understand that concept because for her everything is right now.
More people experience this than they realize.
The parent is expecting a developing brain to comprehend abstract temporal concepts that require cognitive maturity the child hasn't reached.
“Where Are You with Children and time — how they experience it?”
If this sounds familiar, the Library can help you find the bigger picture.