"It's an Old Day!"

Yesterday I took Mia to The Kentlands to see my dad's band play. It was later than we normally take her out (started at 7pm) so when we got home it was almost dark out. After commenting several times during the show that "It's a nice day!," Mia started saying, "Mommy, it's an old day!" once it became dark outside. I thought that was cute & I'm not sure I've heard a kid say that before.