Change day format

[ahsanzia341]

SimpleDateFormat formatter = new SimpleDateFormat("yyyy-mm-dd");
singleDateAndTimePicker.setDayFormatter(formatter);

FATAL EXCEPTION: main
Process: parentinghugs.android.com.parentinghugs, PID: 28806
java.lang.NullPointerException: Attempt to invoke virtual method 'long java.util.Date.getTime()' on a null object reference
at java.util.Calendar.setTime(Calendar.java:1197)
at com.github.florent37.singledateandtimepicker.SingleDateAndTimePicker.getDate(SingleDateAndTimePicker.java:346)
at com.github.florent37.singledateandtimepicker.SingleDateAndTimePicker.updateListener(SingleDateAndTimePicker.java:389)
at com.github.florent37.singledateandtimepicker.SingleDateAndTimePicker.access$000(SingleDateAndTimePicker.java:25)
at com.github.florent37.singledateandtimepicker.SingleDateAndTimePicker$1.onDaySelected(SingleDateAndTimePicker.java:92)
at com.github.florent37.singledateandtimepicker.widget.WheelDayPicker.onItemSelected(WheelDayPicker.java:54)
at com.github.florent37.singledateandtimepicker.widget.WheelPicker.onItemSelected(WheelPicker.java:594)
at com.github.florent37.singledateandtimepicker.widget.WheelPicker.access$700(WheelPicker.java:34)
at com.github.florent37.singledateandtimepicker.widget.WheelPicker$1.run(WheelPicker.java:108)
at android.os.Handler.handleCallback(Handler.java:815)
at android.os.Handler.dispatchMessage(Handler.java:104)
at android.os.Looper.loop(Looper.java:207)
at android.app.ActivityThread.main(ActivityThread.java:5728)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:789)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:679)