Calendar calendar = Calendar.getInstance();
calendar.setTime(postDate);
int year = calendar.get(Calendar.YEAR);
int month = calendar.get(Calendar.MONTH);
Calendar cal = Calendar.getInstance();
cal.setTime(postDate);
int year = cal.get(Calendar.YEAR);
int month = cal.get(Calendar.MONTH);
去读一读API文档中关于Calendar的部分