java中關於時間

<%@ page import="java.util.Date" %>
<%@ page import="java.text.SimpleDateFormat" %>
    <%
    Date date = supplierinf.sicontractdate;
    SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
    String str = format.format(date);
    %>
import java.util.Date;
import java.text.SimpleDateFormat;
    Date date = from.getAfmdate();
    if (null != date) {
      SimpleDateFormat yearFormat = new SimpleDateFormat("yyyy");
      SimpleDateFormat monthFormat = new SimpleDateFormat("MM");
      SimpleDateFormat dayFormat = new SimpleDateFormat("dd");
      to.setAfmYear(yearFormat.format(date));
      to.setAfmMonth(monthFormat.format(date));
      to.setAfmDay(dayFormat.format(date));
    }

    SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
    appPo.setAfmdate(format.parse(appForm.getAfmYear() + "-" +
                                  appForm.getAfmMonth() + "-" +
                                  appForm.getAfmDay()));