When was the baby born according to Sarah?

Sarah: John, I’ve just had some good news. Susan has had her baby.
John: Do you know when she had it?
Sarah: Yesterday. The tenth of August.
John: Oh, Give me the details and I’ll make a note for everyone at work.
Sarah: OK.
John: Well, was it a buy or a gift?
Sarah: It’s a boy.
John: And what are they going to call him?
Sarah: Tom. Tom Lightfoot. It sounds quite good, don’t you think?
John: Yes, that has quite a good ring to it.
Sarah: You know he’s quite a big baby. He weighed four and a quarter kilos when he was born.
John: That does sound big, four and a quarter kilos.
Sarah: With masses of black hair, curly black hair. You know, we should go and visit them in hospital. What about tomorrow afternoon at around 1 p.m.?
John: Yes, OK.
Sarah: Where should we meet? Ah, I could come and pick you up at your house, if you like.
John: Yes, that would be wonderful. My car is still off the road.
Sarah: Just refresh my memory. What’s the address again?
John: It’s 15 Chesterfield Road, Paddington.
Sarah: It’s next to the library, isn’t it?
John: Not exactly. It’s next to a bank. The State Bank actually. The Library is opposite us, on the comer.
Sarah: Now what should we take? We must take them something.
John: I always think flowers are good to take to someone in hospital, don’t you?
Sarah: Well, not really. Everyone always brings flowers and they don’t last. I think it’s much better to take a pot plant, so she can take it home with her.
John: Yes, but then she has to remember to water it. What about a big box of Chocolates?
Sarah: OK, chocolates sound fine. We should get something for the baby too. What do you think?
John: Yes, you’re right. What do you think of something like baby shampoo or talcum powder?
Sarah: I think we should get something they wouldn’t normally buy. What about a teddy bear, a soft toy?
John: Sounds fine. I could get the toy early at the market and probably buy the chocolates there too.
Sarah: That’ll be fine, so I can pay you back for half, I would like to go shares. John: OK.
Sarah: Good, I’ll pick you up then on Sunday at twelve forty-five, bye-bye.
John: See you then. Bye.