“I read it twice, then I said, "Well, why don't you?"
"Why don't I what?"
"Why don't you wish her many happy returns? It doesn't seem much to ask."
"But she says on her birthday."
"Well, when is her birthday?"
"Can't you understand?" said Bobbie. "I've forgotten."
"Forgotten!" I said.
"Yes," said Bobbie. "Forgotten."
"How do you mean, forgotten?" I said. "Forgotten whether it's the twentieth or the twenty-first, or what? How near do you get to it?"
"I know it came somewhere between the first of January and the thirty-first of December. That's how near I get to it.”