将时间戳EEE，d MMM yyyy HH：mm：ss GMT格式转换为yyyy-MM-dd'T'HH：mm：ss'Z'格式？

Question

I want to convert the timestamp Wed, 20 Feb 2013 11:41:23 GMT to 2013-02-20T11:41:23Z . How can I do this? I want to ISO-8601 in UTC format(2013-20-02T04:51:03Z).

My code is below

Date date=new Date();
SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'");
String strDate = date.toString();
Date dt = formatter.parse(strDate );
System.out.println("Date " +dt);

Output is:

Exception in thread "main" java.text.ParseException: Unparseable date: "Wed Feb 20 03:50:03 PST 2013"

Answer 1

Its your format what is wrong, use: "EEE MMM dd HH:mm:ss Z yyyy" that is what is comming out of the exception, in the question you have "EEE, dd MMM yyyy HH:mm:ss Z" for Wed, 20 Feb 2013 11:41:23 GMT

Try:

        Date date = new Date();
        SimpleDateFormat formatter = new SimpleDateFormat(
                "EEE MMM dd HH:mm:ss Z yyyy");
        String strDate = date.toString();
        Date dt = null;
        try {
            dt = formatter.parse("Wed Feb 20 03:50:03 PST 2013");
        } catch (ParseException e) {
            e.printStackTrace();
        }
        System.out.println("Date " + dt);
        System.out.println(new Timestamp(new Date().getTime()));

Answer 2

考虑使用Joda Time ，它内置了对解析和输出ISO格式日期字符串的支持。

new DateTime(DateTimeZone.UTC).toString()

Answer 3

You need 2 DateFormatters, one for parsing and one for output. You have the one for output.

EDIT: Output works like this:

SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'");
String output = formatter.format(new Date());
System.out.println("Date " + output);

Answer 4

DateFormat format = new SimpleDateFormat ("yyyy-MM-dd'T'HH:mm:ss'Z'");
format.setTimeZone (TimeZone.getTimeZone ("UTC"));
Date date = new Date ();
System.out.println ("Date is: " + format.format (date));

Answer 5

You already have a Date object. You just need to format it to String .

formatter.format(date) should give you the desired result if the pattern in the SimpleDateFormat constructor is valid.

With the above implementation your code looks like this:

Date date = new Date();
SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'");
String dt = formatter.format(date);
System.out.println("Date " + dt);

Which results in an output like - Date 2013-02-20T17:39:45Z .