获取某月第一天和最后一天

Calendar ? ca ? = ? Calendar.getInstance();?

ca.setTime(new Date()); ? // ? someDate ? 为你要获取的那个月的时间?

ca.set(Calendar.DAY_OF_MONTH, ? 1);?

Date ? firstDate ? = ? ca.getTime();?

ca.add(Calendar.MONTH, ? 1);?

ca.add(Calendar.DAY_OF_MONTH, ? -1);?

Date ? lastDate ? = ? ca.getTime();??

System.out.println(firstDate.toLocaleString());

System.out.println(lastDate.toLocaleString());