i m getting error on loading rtc file

Arduino: 1.6.5 (Windows 8.1), Board: "Arduino Uno"

datecalc.ino:4:20: fatal error: RTClib.h: No such file or directory
compilation terminated.
Error compiling.

This report would have more information with
"Show verbose output during compilation"
enabled in File > Preferences.

Have you installed that library? ("RTClib")

You can get it here:- RTClib