Jmeter获取时间

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 HH:mm:ss");
    String nowDate = sf.format(date);
    Calendar cal = Calendar.getInstance();
    cal.setTime(sf.parse(nowDate));
    cal.add(Calendar.MINUTE,+5);  //获取后5分钟时间
    //cal.add(Calendar.DATE,+1);  //后一天
    //cal.add(Calendar.DATE,-30);  //前30天
    String datetime = sf.format(cal.getTime());
    vars.put("datetime",datetime);
    
}
catch(Exception e){

}

import java.text.SimpleDateFormat;
SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
    //获取当前月第一天：
    Calendar c = Calendar.getInstance();   
    c.add(Calendar.MONTH, 0);
    c.set(Calendar.DAY_OF_MONTH,1);//设置为1号,当前日期既为本月第一天 
    String first = format.format(c.getTime());
    //log.info("===============first:"+first);
    vars.put("first",first);