How do I delete folders and files that were older than 7 days on the command line?

I want to delete folders and its files were created longer than 7 days using the command line.

*NIX

If you are using *nix and have find available this should do the trick:

find /the/directory/containing/files/to/delete -mtime +7 -exec rm -r {} \;

The flag -mtime is to check the modification timestamp of the found files. If it's above 7*24h ago,
it will execute rm /path/to/file

From the manpage for find

-mtime n  
    File's  data was last modified n*24 hours ago.  See the comments  
    for -atime to understand how rounding affects the interpretation  
    of file modification times.  

WINDOWS XP & VISTA

I never work on windows though I got curious to see what command to be the equivalent to the above in a MS-DOS environment. I found Batch file to delete files older than N days here on stackoverflow.

The relevant command (copy+pasted from the previously linked thread):

forfiles -p "C:\what\ever" -s -m *.* -d <number of days> -c "cmd /c del @path"

WINDOWS 7

Syntax has changed a little therefore the updated command is

forfiles -p "C:\what\ever" -s -m *.* /D -<number of days> /C "cmd /c del @path"