java中各种时间格式的转化(包含java多数情况下时间的转换)

        如果时间为年月日，可以增加时分秒
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
        SimpleDateFormat  sdfSearch = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        if(vo.getRqStart() != null) {
            vo.setRqStart(sdfSearch.parse(sdf.format(vo.getRqStart()) + " 00:00:00"));
      }
        if(vo.getRqEnd() != null) {
           vo.setRqEnd(sdfSearch.parse(sdf.format(vo.getRqEnd()) + " 23:59:59"));
      }

//      设定指定的日期
        Calendar calendar = Calendar.getInstance();
        calendar.setTime(date);
        calendar.add(Calendar.DATE,1);  //当前时间的后一天
//        calendar.add(Calendar.DAY_OF_MONTH,1);
        calendar.set(Calendar.HOUR_OF_DAY,0);  //小时
        calendar.set(Calendar.MINUTE, 0);  //分钟
        calendar.set(Calendar.SECOND, 0);  //秒数
        sdf.format(calendar.getTime());

//把date转成以下格式
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");//------------------------------------------
        Timestamp arriveTime = reinfotocw.get(0).getArriveTime();
        //获取当前时间转成毫秒
        Calendar calendar=Calendar.getInstance();
        long timeInMillis = calendar.getTimeInMillis();

        //获取得到的时间转成毫秒
        Calendar calendar1 = Calendar.getInstance();
        calendar1.setTime(arriveTime);
        long timeInMillis1 = calendar1.getTimeInMillis();

        if(timeInMillis<timeInMillis1){
            System.out.println("ture");
        }else {
            System.out.println("false");
        }

        System.out.println("------------------");
        System.out.println(timeInMillis);
        System.out.println(timeInMillis1);
        System.out.println("------------------");
//------------------------------------------


        Date date=new Date();
        Date date1=null;
        //把字符串转成时间  有时分秒的话需要加上try catch 捕获异常
        try {
            sdf.parse("2018-00-00 00:00:00");
        }catch (ParseException pe){
            pe.printStackTrace();
        }

        //把时间转成字符串
        sdf.format(date);

        //把毫秒转成时间
        date.setTime(timeInMillis);