I think she means to reassure me.
Me: Did you go potty?
Mira (very happy and loud): At two firty seven!
This time the number actually sounded like a time, but often it's something like "Sixteen fifty two!" Which is a time when you're referring to the 24-hour clock, but I don't think she's that smart.
It's probably not a fair question to ask a 2.5-year-old. Like I expect her to have a record of her potty breaks or something.
Another frequent conversation is the following:
Me: Let's go potty!
Mira: I already did yesterday!