Change "Date Taken" Attribute

Hi,

I've got a couple of hundred video clips that I'd like to sort in "date
taken" order within Windows MovieMaker.
The problem is the "date taken" attribute in each of them is blank - only
the "Date modified" attribute details when the clips were shot. Although I
can sort on this attribute in explorer, I cant in MovieMaker.

Therefore, I'd like to automatically update the Date Taken attribute with
the Date Modified attribute for all the files in a batch process.

Any ideas how I can do this?

thanks,
g.