GMT时间CST时间13位时间戳相互转换

    public static void main(String[] args) {
        //当前时间==>gmt
        Date date=new Date();
        System.out.println("GMT时间"+date.toGMTString());
        //当前时间==>13时间戳
        long l=date.getTime();
        System.out.println("时间戳"+l);
        System.out.println("=====================================");
        //gmt==>cst==>13位时间戳
        try {
            date=getCST("Sun, 11 Mar 2018 09:40:21 GMT");
            System.out.println("CST时间"+date);
            System.out.println("时间戳"+date.getTime());
        } catch (ParseException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        //时间戳==>gmt
        String res;
        SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        long lt = new Long("1520757316886");
        Date datee = new Date(lt);
        System.out.println("GMT时间"+datee.toGMTString());
        res = simpleDateFormat.format(datee);

        System.out.println("CST时间"+res);
    }
    public static Date getCST(String strGMT) throws ParseException{   
        DateFormat df = new SimpleDateFormat("EEE, d MMM yyyy HH:mm:ss z", Locale.ENGLISH);    
           return df.parse(strGMT);
           
        }
}