I want to Copy/Move files in Windows XP from Desktop(a Folder) to My Document(another Folder), which was created by same Batch File on Current Date in Format DD/MM/YYYY.
Try putting lines that has file/folder names with spaces in quotes e.g. update this line
mkdir %USERPROFILE%\My Documents\%date%
to
mkdir "%USERPROFILE%\My Documents\%date%"