By default, screenshots (cmd⌘ + shift⇧ + 3) are saved on your desktop along with the date and time they were taken. It’s possible to to remove the date and time stamp from the file names of screenshots, use the following command in Terminal:
defaults write com.apple.screencapture “include-date” 0; killall SystemUIServer
Revert to the default setting with the following command
defaults write com.apple.screencapture “include-date” 1; killall SystemUIServer
This does not work for me. I have to do this instead:
defaults write com.apple.screencapture include-date -bool false; killall SystemUIServer