Change Power Up Time

[duniya]

I am trying to change up the "power up time" on several photos taken on a nikon d300 camera that were not set correctly for a buddy of mine.  I have done a lot of research into this and have not found a way to figure out how to change this date/time field. It seems that no one has any documentation on how that data field is formatted.  it is not human readable in a hex editor.  That field seems to be an integer based on a few posts i have found about it, can anyone give me insight into how it is formatted and how to change it?   THANKS FOR YOUR HELP

[Phil Harvey]

Thanks for pointing out this problem in ExifTool.  This is an oversight on my part.  I will add the ability to write this tag to the next version, and ExifTool 8.49 will have this ability when it is released (in about a week or so).

The problem is that I forgot to code the inverse conversion for this tag.

- Phil