取文件修改时间国际时

import java.sql.Date;

 import java.text.SimpleDateFormat;

 

File openf=new File(filename);

SimpleDateFormat dd =new java.text.SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

 Date now=new Date(openf.lastModified());

dd.setTimeZone(TimeZone.getTimeZone("GMT"));

watchtime=dd.format(now );//watchtime是字符串