didital clock DE2 by nios II

I want to design a digital clock with hour,minutes,second on DE2 and I use Nios II to program.when I built Sopc, System of me included Cpu,jtag_uart, sysid, lcd, buttons, on_chip memory,and timer.I don't know what it miss? can you help me? I want to know what I miss on sopc system or it enought to program by nios II. Thank!:)