Java DateTimeFormatter: DateTimeParseException with GMT-date

Question

I would like to parse an GMT-date like Wed, 21 Oct 2016 07:28:00 GMTwith DateTimeFormatter into an Instant. To create the pattern i used the official documentation: DateTimeFormatter

My code so far:

String date = "Wed, 21 Oct 2016 07:28:00 GMT";

DateTimeFormatter gmtFormat = DateTimeFormatter.ofPattern("EEE' dd LLL yyyy HH:mm:ss '''");
TemporalAccessor parsed = gmtFormat.parse(date);
Instant a = Instant.from(parsed);

System.out.println(a);

But every time i've got this error:

Exception in thread "main" java.time.format.DateTimeParseException: Text 'Wed, 21 Oct 2016 07:28:00 GMT' could not be parsed at index 0
at java.time.format.DateTimeFormatter.parseResolved0(DateTimeFormatter.java:1949)
at java.time.format.DateTimeFormatter.parse(DateTimeFormatter.java:1777)

At index 0 is Wed, I used EEE which represents day-of-week by definition, there are also examples which represent: Tue; Tuesday; T.

I've also tried lower-, and uppercase but not successfully. What is wrong? Did I overlook something?

Try outputting gmtFormat.format(Instant.now()) to see if you really get what you expect. Can there be any localization involved? — Bob Jacobsen
– Bob Jacobsen, Commented Mar 30, 2018 at 18:58
@BobJacobsen i've got this error: Unsupported field: DayOfWeek — Simon
– Simon, Commented Mar 30, 2018 at 19:00

Simon · Accepted Answer · 2018-04-10 16:40:30Z

5

It works with the code

String date = "Fri, 21 Oct 2016 07:28:00 GMT";

DateTimeFormatter gmtFormat = DateTimeFormatter.RFC_1123_DATE_TIME;
TemporalAccessor parsed = gmtFormat.parse(date);
Instant a = Instant.from(parsed);

System.out.println(a);

But you have to change the day because otherwise it doesn't fit to the given date.

edited Apr 10, 2018 at 16:40

Simon

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answered Mar 30, 2018 at 18:57

watchme

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Comments

SCouto · Accepted Answer · 2018-03-30 19:04:31Z

0

EEE is the proper format for Wed. But it does not include the comma.

Try this:

DateTimeFormatter gmtFormat = DateTimeFormatter.ofPattern("EEE, dd MMM yyyy HH:mm:ss '''");

Useful link

edited Mar 30, 2018 at 19:04

answered Mar 30, 2018 at 18:59

SCouto

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4 Comments

Simon Over a year ago

Didn't i excluded it by using '?

SCouto Over a year ago

@SimonW. Not sure really. I usually write explicitlly the intermediate characters if present. Check this link, It may help fileformat.info/tip/java/simpledateformat.htm

SCouto Over a year ago

Also what about LLL? I think the month name flag is MMM

Bob Jacobsen Over a year ago

MM is the numeric form "10" and LLL is the text form "Oct". docs.oracle.com/javase/8/docs/api/java/time/format/…

Bob Jacobsen · Accepted Answer · 2018-03-30 19:16:20Z

0

You're asking for redundant information: The day of the week and the date.

Change the format to just ignore the first three characters, leaving it reading the day/month/year.

answered Mar 30, 2018 at 19:16

Bob Jacobsen

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