A new bug has surfaced for some users in Calendar display on iOS 7, where the current time is offset by one hour, despite the fact that the status bar shows the correct time. The bug appears to be limited to the Calendar display, since alarms and events are not disturbed in any way, they're correctly timed and displayed. For example, due to the bug, the app will draw current time line at the 1:15 PM slot if the time is 12:15 PM. This isn't the first time we're hearing about a daylight saving time bug in an Apple device.
Ubergizmo , New Daylight Saving Time Bug Surfaces In iOS 7, New Daylight Saving Time Bug Surfaces In iOS 7