You can try like below

from datetime import datetime
datevalue = datetime.now().strftime("%Y%m%d")
 
src = 'dbfs:/FileStore/Test/File.csv'
trgt = f'dbfs:/FileStore/Test/File{datevalue}.csv' 
 
dbutils.fs.cp(src,trgt)
 
 

Happy Learning!!

Thanks for reading and like if this is useful and for improvements or feedback please comment.