Sometimes it happens that you take photos with a camera, and realize right in the middle of your session that the time of the camera is totally offset. In such cases: just keep taking photos and make sure that you take a photo of a clock at some point.

Afterwards, download the images, check the actual time offset by comparing the photographed clock and the time and date given in that image, and use exiftool to correct the time stamps of the photo. For example, imagine you have to change teh time by adding two hours and fifteen minutes:

$ exiftool -AllDates-='2:15' *.JPG

You can check the actual date of the image either by the usual GUI programs or on command line:

$ exiftool MyImage.jpg|grep Time
File Modification Date/Time     : 2011:11:03 13:00:39+01:00
Exposure Time                   : 1/100
Date/Time Original              : 2009:09:05 07:07:49

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Source: FULL ARTICLE at Planet KDE