Answer by user3291565 for "Debug certificate expired" error in Eclipse Android plugins

First close the eclipse then

Open CMD by Window Key + R or via Run as Admin

Follows the following step

del "%USERPROFILE%\.android\debug.keystore"keytool -genkey -v -keystore "%USERPROFILE%\.android\debug.keystore" -alias androiddebugkey -storepass android -keypass android -keyalg RSA -validity 30000

after this restart eclipse.