获取某月前日期 ，并比较当前月与某月是否相差 X月内

public class test3 {

public static void main(String[] args) {
	
	
	 SimpleDateFormat format = new SimpleDateFormat("yyyyMM");
	 
	 //获取
	 Calendar nowTime = Calendar.getInstance();
	 
	 nowTime.add(Calendar.MONTH, -2); //当前日期-3个月
	 
	 Date time = nowTime.getTime();
     String formatStr = format.format(time);
     System.out.println("格式化后的时间："+formatStr);
	
}


public static String getLastMonth() {
    SimpleDateFormat format = new SimpleDateFormat("yyyyMM");
    Date date = new Date();
    Calendar calendar = Calendar.getInstance();
    calendar.setTime(date); // 设置为当前时间
    calendar.set(Calendar.MONTH, calendar.get(Calendar.MONTH) - 1); // 设置为上一个月
    date = calendar.getTime();
    String lastMonth = format.format(date);
    return lastMonth;
}


}

}