IPhone (and most of Smartphones) are able to update time automatically depending on where you are.
As a result of this option, if you are taking a flight from London to Zaragoza, for example, after arriving and opening data again, the time left on your iPhone will be the best time in Spain.
The same applies to time changes, if the & # 39; Auto-adjust & # 39;
Although it is a very efficient method, using it consumes a small percentage of the battery. If you want to make it work, go to & # 39; Settings> Date and Time> Auto-correction & # 39;