China DOS Union

Can anyone tell me a batch command that does the following:
On a 2003 system, every day at 0:00, copy the files newly created the previous day in a specific directory to an FTP server in another city

First use set /a to get the current date, then still use set /a to calculate the previous day's date, paying attention to the end-of-month case.
Then use the xcopy /d command to copy the previous day's files
Finally add this file to Task Scheduler. Although batch files do have their own delay function, it is not recommended to use it.