java中对date相关操作

String startTime, String endTime;      
Date start = null;      
            Date end = null;      
            Date startTimeStamp = null;      
            Date endTimeStamp = null;      
     
            try {      
     
                SimpleDateFormat df = new SimpleDateFormat("yyyyMMdd");      
                SimpleDateFormat dfs = new SimpleDateFormat("yyyyMMddHHmm");      
     
                startTimeStamp = dfs.parse(startTime);      
                endTimeStamp = dfs.parse(endTime);      
     
                start = df.parse(startTime.substring(0, 8));      
                end = df.parse(endTime.substring(0, 8));      
     
            } catch (ParseException e) {      
     
                e.printStackTrace();      
                logger.error("Time format must match [yyyyMMddHHmm].");      
                throw new BusinessException(e.getMessage());      
            }      
     
            stmt.setDate(1, new java.sql.Date(start.getTime()));      
            stmt.setDate(2, new java.sql.Date(end.getTime()));      
     
Date time = new Date(day.getTime() + (i - 1) * 300000);      
     
     
if (time.getTime() < startTimeStamp.getTime() || time.getTime() > endTimeStamp.getTime()) {      
                        .....      
                    }    

//日期转换为字符串：

String str=df.format(time);