https://bugs.kde.org/show_bug.cgi?id=496389

            Bug ID: 496389
           Summary: Tool to determin time difference from clock photo show
                    diffent timestamp
    Classification: Applications
           Product: digikam
           Version: 8.5.0
          Platform: Microsoft Windows
                OS: Microsoft Windows
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: Plugin-Generic-TimeAdjust
          Assignee: digikam-bugs-n...@kde.org
          Reporter: e.hilg...@gmx.de
  Target Milestone: ---

Created attachment 175884
  --> https://bugs.kde.org/attachment.cgi?id=175884&action=edit
detailed descripton screenshot of behauvior

SUMMARY
In the "Adjust Time & Date" Tool, when using the "Determine Time Difference
With Clock Photo" the wrong time difference is calculated. 

STEPS TO REPRODUCE
1. Load Clock Photo in the tool "Determine Time Difference With Clock Photo". 
2. See in the bottom, where you set the time from the photo is another time as
the timestamp used by the "Adjust Time & Date" Tool
3. type in the time shown on the clock in the photo
4. The calculated difference of 2 hours (+something) is wrong (one hour to
early)

OBSERVED RESULT
The time in "timestamp updated" collum shows another time, as the time of the
clock entered in the tool

EXPECTED RESULT
the time in the "timestamp updated" collum should be the exact time entered for
the clock photo

SOFTWARE/OS VERSIONS
Windows: 11 Pro / 23H2 / Build 22631.4460
macOS: 
(available in the Info Center app, or by running `kinfo` in a terminal window)
Linux/KDE Plasma: 
KDE Plasma Version: 
KDE Frameworks Version: 
Qt Version: 

ADDITIONAL INFORMATION
When i took the photo, the camera was still configured in summer time, even
though it was winter time. 
In the metadata from exiftool i can see a TimeZone of +2, but it was +1 at the
time the picture was taken. 
So the  timestamp of the photo is about an hour later then it was. 
The difference calculation should result in a difference of about an hour, but
it actualy shows a difference of about 2 hours.

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