KINDLE EXPORT with modified date in the FrontMatter?

This software is so powerful, I get lost in the endless possibilities.
To review the last day’s work, I like to do a Kindle export. The reading is pretty close to what you feel with a regular book. But my kindle library get messy, with all the different versions.
Is there any way by which I can automatically generate the export date in the Front Matter? I looked for a tag holder in the documentation but could not find one.