- SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
-
- //获取前月的第一天
- 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
- firstDay = format.format(cal_1.getTime());
- System.out.println("-----1------firstDay:"+firstDay);
- //获取前月的最后一天
- 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
- lastDay = format.format(cale.getTime());
- System.out.println("-----2------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);
-
- /**
- * 字符串的日期格式的计算
- */
- public static int daysBetween(String smdate,String bdate) throws ParseException{
- SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd");
- Calendar cal = Calendar.getInstance();
- cal.setTime(sdf.parse(smdate));
- long time1 = cal.getTimeInMillis();
- cal.setTime(sdf.parse(bdate));
- long time2 = cal.getTimeInMillis();
- long between_days=(time2-time1)/(1000*3600*24);
- return Integer.parseInt(String.valueOf(between_days));
- }
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