Java Date to String dateToRFC3339(Date d)

Description

Format dates as specified in rfc3339 (required for Atom dates)

License

Open Source License

Parameter

Parameter	Description
d	the Date to be formatted

Return

the formatted date

Declaration

public static String dateToRFC3339(Date d) 

Method Source Code

//package com.java2s;
/* (c) 2014 Open Source Geospatial Foundation - all rights reserved
 * (c) 2001 - 2013 OpenPlans/*w w w  . j a  v  a2s  . com*/
 * This code is licensed under the GPL 2.0 license, available at the root
 * application directory.
 */

import java.text.DateFormat;
import java.text.DecimalFormat;
import java.text.NumberFormat;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;

import java.util.TimeZone;

public class Main {
    /**
     * A date formatting object that does most of the formatting work for RFC3339.  Note that since 
     * Java's SimpleDateFormat does not provide all the facilities needed for RFC3339 there is still
     * some custom code to finish the job.
     */
    private static DateFormat rfc3339 = new SimpleDateFormat(
            "yyyy-MM-dd'T'HH:mm:ss");
    /**
     * A number formatting object to format the the timezone offset info in RFC3339 output.
     */
    private static NumberFormat doubleDigit = new DecimalFormat("00");

    /**
     * Format dates as specified in rfc3339 (required for Atom dates)
     * @param d the Date to be formatted
     * @return the formatted date
     */
    public static String dateToRFC3339(Date d) {
        StringBuilder result = new StringBuilder(rfc3339.format(d));
        Calendar cal = new GregorianCalendar();
        cal.setTime(d);
        cal.setTimeZone(TimeZone.getDefault());
        int offset_millis = cal.get(Calendar.ZONE_OFFSET)
                + cal.get(Calendar.DST_OFFSET);
        int offset_hours = Math.abs(offset_millis / (1000 * 60 * 60));
        int offset_minutes = Math.abs((offset_millis / (1000 * 60)) % 60);

        if (offset_millis == 0) {
            result.append("Z");
        } else {
            result.append((offset_millis > 0) ? "+" : "-")
                    .append(doubleDigit.format(offset_hours)).append(":")
                    .append(doubleDigit.format(offset_minutes));
        }

        return result.toString();
    }
}

Related

1. dateToIso8601String(Date date)
2. dateToISODate(Date date)
3. dateToOracleDateString(Date date)
4. dateToRelativeTime(Date date)
5. dateToRFC1123(Date date)
6. dateToStr(Date date)
7. dateToStr(Date date)
8. dateToStr(Date date)
9. dateToStr(Date date)