Jmeter获取当前时间进行时间段加减操作

import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;

try{
    Date date =new Date();  //获取当前时间
    SimpleDateFormat sf = new SimpleDateFormat("yyyy-MM-dd");
    String nowDate = sf.format(date);
    Calendar cal = Calendar.getInstance();
    cal.setTime(sf.parse(nowDate));
   
    cal.add(Calendar.DAY_OF_YEAR,-1);  
    String orderDate = sf.format(cal.getTime());
    vars.put("orderDate",orderDate);
    
    cal.add(Calendar.DAY_OF_YEAR,-6); 
    String senderDate = sf.format(cal.getTime());
    vars.put("senderDate",senderDate);
    
}
catch(Exception e){
    
}