The main documentation of the Get_CPU_Time Procedure contains additional explanation of this code listing.
function Get_CPU_Time () ! Output variable. type(real) :: Get_CPU_Time ! CPU time counter in seconds. !~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ! Verify requirements - none. ! Intrinsic F95 call to get cpu time info. call CPU_TIME (Get_CPU_Time) ! Verify guarantees - none. return end function Get_CPU_Time