How can I know what is the user name that hash my files ? and what is the date that my files got hashes?

I have a folder called " xyz ", in this folder there are files with their hashesThe command that I used is " sha1sum " so I would like to know the username who did the hashesand the date when my files got hashed

I tired to use:

(whoami; date) >~home/xyz/

But it did not work