How to stop "Monkey Test" and "Time Service" apps When I long-press the "home" button to close all apps, there is an app named "time service" with android symbol and another named "monkey test" that are always open. 

How to stop this?
"Monkey Test" and "Time Service" are being reported recently by some anti-virus programs for Android as malware, as reported here in the Norton Community forum, and here at Android Central. In general form, they suggest the normal actions: 


Disabling installations from "Unknown Sources",
 Settings -> Security -> Device administration -> Unknown sources
Disabling the app,
 Settings -> Application manager -> AppName -> Disable/Uninstall
Checking to see if "Device Administrators" has it blocked from uninstalling, and then trying the uninstall again.
 Settings -> Security -> Device administration - > Device administrators
Factory Reset


Both communities also suggest the use of some uninstallers for malware, which I won't cover here, in addition to rooting as a final option to totally remove it/them.