java定时任务，现在为一天一同步，需要改为一周一同步，代码如下，本人菜鸟请大神搭救

public class ElectricContractServiceImpl implements ElectricContractService {
private static final Logger log = Logger.getLogger(ElectricContractServiceImpl.class);
private ElectricContractDao electricContractDao;
private InquiryContractDAO inquiryContractDAO;
@SuppressWarnings("unchecked")
public void AutoExcute() throws Exception {
String fileRealPath = "";// 附件的完整路径
SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd");
//格式化对象
String strD = sdf.format(new Date());
//当天执行，获取前一天数据
String beginTime = DateConvertor.dateToString(DateConvertor.offsetDate(new Date(), -1, "day"), "yyyy-MM-dd HH:mm:ss");
String endTime = DateConvertor.dateToString(new Date(), "yyyy-MM-dd HH:mm:ss");
List list = electricContractDao.findContract(beginTime, endTime);
// 根路径
String base = FtpPropertiesReader.getProperty("ftpElectricLocalDir");
String filename = "ContractInfo_" + strD; // 文件名
fileRealPath = base + filename + ".csv";
File file = new File(fileRealPath);// 新建文件
if (!file.exists()) {
file.createNewFile();
}
if (log.isDebugEnabled()) {
log.debug("创建文件-开始");
}
FileOutputStream outStr = new FileOutputStream(file);
BufferedOutputStream buff = new BufferedOutputStream(outStr);
// 生成新的csv文件
StringBuffer title = new StringBuffer(); // 一行数据 标题

//当天执行，获取前一天数据
String beginTime = DateConvertor.dateToString(DateConvertor.offsetDate(new Date(), -1, "day"), "yyyy-MM-dd HH:mm:ss");
String endTime = DateConvertor.dateToString(new Date(), "yyyy-MM-dd HH:mm:ss");
List list = electricContractDao.findContract(beginTime, endTime);
这段代码的第一行改一下(-1改成-7)
String beginTime = DateConvertor.dateToString(DateConvertor.offsetDate(new Date(), -7, "day"), "yyyy-MM-dd HH:mm:ss");

//当天执行，获取前一天数据
String beginTime = DateConvertor.dateToString(DateConvertor.offsetDate(new Date(), -1, "day"), "yyyy-MM-dd HH:mm:ss");

参数-1表示当前时间new Date()减去一天，你推迟一周吧-1改成-7就可以了嘛

你这问题不是程序员该问的，太丢人