By default, when you screenshot with command-shift-3 shortcuts in OS X, you'll notice that the resulting picture name is divided into two parts: "screenshot" followed by the "date and time of screenshots" section (such as 2015-04-17 09.19.45). This can be a very useful feature for most people, because it lets you know when the screenshots are going to be, or sort the screenshots according to it. But for the author or some others, this may be annoying, and I need to rename the screenshot file again.
How to remove the "date and Time" section from the screenshot file name
First step: Start the terminal application.
Step Two: Copy the following command and paste it into the terminal window, and then press RETURN (enter).
Defaults write com.apple.screencapture "include-date" 0
Step three: Then enter the following command, and then press RETURN again.
Killall Systemuiserver
It's that simple. Now you will find that when you take a screenshot, the name of the file will no longer contain the date and time of the screenshot.
Note 1: If you want to restore the default style, replace the "1" in the second step with "0".
NOTE 2: after you screen every time, the name will be automatically followed by "screenshot snapshot","screenshot 1","screenshot 2" ... To sort, very conveniently.