Some iOS users have trouble with switch to Daylight Savings Time
Even with your Apple iPhone aware of your location, the clocks are showing incorrect time. One Florida based user has a clock running on Chicago time and in Arizona, where DST in not observed, the Apple iPhone moved some clocks ahead an hour. A simple device restart might fix the problem, or turning the time automation off and on again might do the trick.
In the future, Apple iPhone users might do well to heed the advice from one iPhone user who suggests using the device's countdown timer as a backup just in case the clock on the phone goes wonky. And as far as today's shift to Daylight Savings Time (or "Summer Time" in Europe), we would suggest just checking with another time source for now, just until you've either confirmed that the clock on your iOS device is correct or until you have set the correct time yourself.