Don’t Want To LEAP To Conclusions, But…

(I work at a help desk for a hotel management software.)

Receptionist: “The software isn’t working.”

Me: “What’s wrong?”

Receptionist: “I’m trying to change the departure date, but it doesn’t let me do it.”

Me: “What date are you trying to set?”

Receptionist: “February 30.”

Me: “Try with February 28.”

Receptionist: “Oh, now it’s working. Why is there a problem with February 30?”

Me: “…”