JAVA获取月第一天、最后一天

SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd"); //获取前一个月的第一天 Calendar cal_1=Calendar.getInstance(); //获取当前日期 cal_1.add(Calendar.MONTH, -1); cal_1.set(Calendar.DAY_OF_MONTH,1); //设置为1号,当前日期既为本月第一天 String firstDay = format.format(cal_1.getTime()); System.out.println("firstDay:"+firstDay); //获取前一个月的最后一天 Calendar cale = Calendar.getInstance(); cale.set(Calendar.DAY_OF_MONTH,0); //设置为1号,当前日期既为本月第一天 String lastDay = format.format(cale.getTime()); System.out.println("lastDay:"+lastDay); //获取当前月第一天: Calendar c = Calendar.getInstance(); c.add(Calendar.MONTH, 0); c.set(Calendar.DAY_OF_MONTH,1); //设置为1号,当前日期既为本月第一天 String first = format.format(c.getTime()); System.out.println("first:"+first); //获取当前月最后一天 Calendar ca = Calendar.getInstance(); ca.set(Calendar.DAY_OF_MONTH, ca.getActualMaximum(Calendar.DAY_OF_MONTH)); String last = format.format(ca.getTime()); System.out.println("last:"+last);


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