https://bugs.kde.org/show_bug.cgi?id=389835

            Bug ID: 389835
           Summary: Incorrect DateTime manipulation if timestamp is before
                    unix epoch time
           Product: digikam
           Version: 5.5.0
          Platform: Ubuntu Packages
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: BatchQueueManager-Tool-TimeAdjust
          Assignee: digikam-bugs-n...@kde.org
          Reporter: antoniodipo...@gmail.com
  Target Milestone: ---

I apologize in advance for my bad and poor English but this is what I can write
The problem appears when I want to change the modification date&time of images
using BatchQueueManager.  
Example: 
Property of my image  Date:02/02/18 10:26 as last modified time stamp 
I would like to change all time stamps (EXIF, IPTC,XMP and File last modified)
to 03 February 1965 00:00:01; the result is:
In file property Date:07/02/06 07:28 as last modifed timestamp
In all other Metadata (EXIF etc) Date and Time 1965:02:03 00:00:01
If I read stat data of image from command line: stat image.jpg I obtain:

Modifica : 2106-02-07 07:28:15.000000000 +0100 (modified timestamp)

If I use command 'touch -m -d "Feb 03 1965 00:00:01" image.jpg I get from stat:
 Modifica : 1965-02-03 00:00:01.000000000 +0100(modified timestamp)
Now the Digikam file property shows Date: 12/03/01 06:28
Please note that if I use  timestamp after unix epoch there are no problems.
If you need more info please tell me; i'll do my best to help you to find this
strange bug.
Best regards Antonio

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