I could not get date formatting to work with the -d option after updating to version 7.39. The -d option seems to be totally ignored. I am using the Windows executable on XP SP2.

I downgraded back to version 7.38 and it is working again.

The previous version 7.38 windows executable is available here http://www.sno.phy.queensu.ca/~phil/exiftool/exiftool-7.38.zip