Took some photos on the birth of my child, but forgot to set the date on the camera.
All my photos's EXIF head date stamp are wrong.

Luckily, I found this utility called JHead (http://www.sentex.net/~mwandel/jhead/).
Even luckier I took a photo of the clock in the delivery room. With this I was able to establish the time difference between the actual time the photo was taken and the timestamp on its EXIF.

With a simple command using JHead, I was able to set the timestamp to the correct time:
jhead -da2009:06:12/03:59-2009:06:04/13:59 *.JPG