java.lang.IllegalArgumentException: Invalid format: "Thu May 24 2018 14:00:00 GMT+0200"

Question

I´m trying to convert a String date like "Thu May 24 2018 14:00:00 GMT+0200" to Joda DateTime (v.2.9.9) but I obtain Invalid format exception:

    String pattern = "EEE MMM dd yyyy HH:mm:ss 'GMT'Z";
    DateTimeFormatter formatter = DateTimeFormat.forPattern(pattern);

    for (int i=0; i < arrayHorarios.length; i++) {
        DateTime dateTime = new DateTime();
        dateTime = formatter.withOffsetParsed().parseDateTime(arrayHorarios[i]);
    }

What am I doing wrong? My goal is to convert all Strings containing dates to Java Dates and then save them into DB... what´s the easiest way to do it? (with or without Joda).

EDIT:

I changed to the correct pattern. Using Java DateFormat was useless too:

ObjectMapper mapper = new ObjectMapper();

    String[] arrayHorarios = mapper.readValue(horariosSave, String[].class);

    DateFormat df = new SimpleDateFormat("EEE MMM dd yyyy HH:mm:ss z", Locale.ENGLISH);
    //sdf.setTimeZone(TimeZone.getTimeZone("GMT"));

    List<Date> hor = new ArrayList<Date>();
    Date date = new Date();

    try {

        for (int i=0; i < arrayHorarios.length; i++) {
            // conversión de String a Date de los valores                
            System.out.println("Horario nº:"+i);
            System.out.println("String = "+arrayHorarios[i]);

            date = df.parse(arrayHorarios[i]);
            System.out.println("Date = " + df.format(date));          

            hor.add(date);
        }

        System.out.println("Clases guardadas:"+hor.size());

    } catch (Exception e) {
        e.printStackTrace();
    }

This way I get this exception:

java.text.ParseException: Unparseable date: "Fri May 25 2018 12:00:00 GMT+0200" at java.text.DateFormat.parse(DateFormat.java:366)

Answer 1

java.time

I wonder if there is a way to do it with Java 8 Util Time.

Of course there is.

    String pattern = "EEE MMM dd yyyy HH:mm:ss 'GMT'Z";
    DateTimeFormatter formatter = DateTimeFormatter.ofPattern(pattern, Locale.ENGLISH);
    String horario = "Thu May 24 2018 14:00:00 GMT+0200";
    OffsetDateTime dateTime = OffsetDateTime.parse(horario, formatter);
    System.out.println(dateTime);

Prints:

2018-05-24T14:00+02:00

Imports used are:

import java.time.OffsetDateTime;
import java.time.format.DateTimeFormatter;
import java.util.Locale;

Joda-Time

Not that you’ll regret upgrading to java.time, your Joda-Time code seems to be working too:

    String pattern = "EEE MMM dd yyyy HH:mm:ss 'GMT'Z";
    DateTimeFormatter formatter = DateTimeFormat.forPattern(pattern);
    String horario = "Thu May 24 2018 14:00:00 GMT+0200";
    DateTime dateTime = formatter.withOffsetParsed().parseDateTime(horario);
    System.out.println(dateTime);

This prints:

2018-05-24T14:00:00.000+02:00

I suspect that your problem may be somewhere else.

PS You may already be aware that the Joda-Time home page says:

Users are now asked to migrate to java.time (JSR-310).