How do I change the metadata, xmp (for change data creation file)of an AI file

[AntoDrew211]

I need to change the creation and modification date of an Illustrator file, I've tried with some applications but when I enter Illustrator >>>>>File Info, the change doesn't happen.
It is really urgent and I would like to know how I can do it.

[StarGeek]

First you need to figure out what tags you need to change.  FAQ #3 would normally be the starting point, but since you specifically want to figure out a timestamp, that can be narrowed down with this command
exiftool -time:all -G1 -a -s file.ai

Look at the output from that command and find which tags have the date you want to change.  Then all you need to run is
exiftool -TAG="2021:05:24 12:00:00" file.ai
replacing TAG with the name of the tag you want to replace and setting the time to the new timestamp.  See FAQ #5 for more details on time related tags.