The System->Time Settings page shows the correct region, timezone, time and date. My iPhone is set for the correct time, date, and time zone. However, the Hora de Dormir setting (I am using the iOS app in Spanish) is using the wrong timezone, so the restrictions turn on and off at the wrong times. I'm not sure what timezone they're actually using, but on Friday evening, the system thinks it is already Saturday, so the weekend restrictions are active.

How do I fix this?