How do I add time/date stamp to my screen capture file names?

Question

I'm on mac osx.
I'm trying to add time/date stamp to my screen capture file names. (at the moment it's just 'Picture 1' etc..)
I've tried the following command  in terminal but have not had success. please help!!
defaults write com.apple.screencapture name "datestamp" at "timestamp"
killall SystemUIServer

Answer 1

Surely someone else will provide a better solution. Meanwhile, however, you might want to try the following script. Copy and paste the script into the AppleScript Editor's window and save it as an application. Then drop your screen capture files on the droplet's Finder icon.
on open theDroppedFiles
    tell application "Finder"
        repeat with thisFile in theDroppedFiles
            set theFileName to name of thisFile
            if (word 1 of theFileName is "Picture") and ¬
                (word 2 of theFileName = word -2 of theFileName) then
                set theExtension to name extension of thisFile
                set P to offset of theExtension in theFileName
                set theCreationDate to creation date of thisFile
                set dateStamp to short date string of theCreationDate
                set timeStamp to time string of theCreationDate
                set name of thisFile to "Screen Shot " & dateStamp ¬
                    & " at " & timeStamp & "." & theExtension
            end if
        end repeat
    end tell
end open
Message was edited by: Pierre L.