Parsing ISO-8601 DateTime with Colons in Offset Using Java

When encountering a date and time string in the ISO-8601 format that includes a colon in the offset, parsing it in Java can prove challenging. Consider the specific case of a date and time string in the following format:

2013-04-03T17:04:39.9430000 03:00

To successfully parse this string and convert it to a more readable format, such as "dd.MM.yyyy HH:mm," we can utilize Java's SimpleDateFormat class.

The following Java code demonstrates how to parse and reformat the date and time string:

import java.text.SimpleDateFormat;
import java.util.Date;

public class Iso8601DateTimeParser {

    public static void main(String[] args) {
        // Input date string in ISO-8601 format
        String dateString = "2013-04-03T17:04:39.9430000 03:00";

        // Create SimpleDateFormat objects for input and output formats
        SimpleDateFormat inFormat = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ssZ");
        SimpleDateFormat outFormat = new SimpleDateFormat("dd.MM.yyyy HH:mm");

        try {
            // Parse the input date string into a Date object
            Date dtIn = inFormat.parse(dateString);

            // Reformat the Date object to the desired output format
            String dtOut = outFormat.format(dtIn);

            // Print the reformatted date string
            System.out.println("Reformatted Date: "   dtOut);
        } catch (ParseException e) {
            // Handle parsing exception
            System.err.println("Error parsing date string: "   e.getMessage());
        }
    }
}

This code snippet accomplishes the following steps:

1. Creates two SimpleDateFormat objects, one for parsing the input date and time string and the other for formatting the output.
2. Parses the input date and time string into a Date object.
3. Reformats the Date object using the output format string.
4. Outputs the reformatted date and time string.