Rtc_Pcf8563 lib returning 0 for rtc.getday()

I am able to get strings from rtc.formatTime() and rtc.formatDate() from library Rtc_Pcf8563, but if i use these functions; byte getSecond(); byte getMinute(); byte getHour(); byte getDay(); byte getMonth(); byte getYear(); byte getWeekday(); byte getStatus1(); byte getStatus2(); i get 0 value. what might be the problem

i get 0 value. what might be the problem

Most likely you have not started the clock running.