Mega Code Archive
Utility class for formatting and parsing the various date formats we expect to encounter
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/*
* $Id$
*
* Copyright (C) 2006 Josh Guilfoyle <jasta@devtcg.org>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2, or (at your option) any
* later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* Code lifted from Informa <http://informa.sourceforge.net>.
*/
//package org.instedd.geochat.api;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Locale;
import java.util.TimeZone;
import android.util.Log;
/**
* Utility class for formatting and parsing the various date formats we expect
* to encounter.
*/
public class DateUtils
{
private static final String TAG = "DateUtils";
private static final SimpleDateFormat[] dateFormats;
private static final int dateFormat_default = 2;
private DateUtils() { }
static
{
final String[] possibleDateFormats =
{
"EEE, dd MMM yyyy HH:mm:ss z", // RFC_822
"EEE, dd MMM yyyy HH:mm zzzz",
"yyyy-MM-dd'T'HH:mm:ssZ",
"yyyy-MM-dd'T'HH:mm:ss.SSSzzzz", // Blogger Atom feed has millisecs also
"yyyy-MM-dd'T'HH:mm:sszzzz",
"yyyy-MM-dd'T'HH:mm:ss z",
"yyyy-MM-dd'T'HH:mm:ssz", // ISO_8601
"yyyy-MM-dd'T'HH:mm:ss",
"yyyy-MM-dd'T'HHmmss.SSSz",
"yyyy-MM-dd"
};
dateFormats = new SimpleDateFormat[possibleDateFormats.length];
TimeZone gmtTZ = TimeZone.getTimeZone("GMT");
for (int i = 0; i < possibleDateFormats.length; i++)
{
/* TODO: Support other locales? */
dateFormats[i] = new SimpleDateFormat(possibleDateFormats[i],
Locale.ENGLISH);
dateFormats[i].setTimeZone(gmtTZ);
}
}
/**
* Parse a date string. The format of RSS/Atom dates come in many
* different forms, so this method is extremely flexible and attempts to
* understand many different formats.
*
* Copied verbatim from Informa 0.7.0-alpha2, ParserUtils.java.
*
* @param strdate
* Date string to attempt to parse.
*
* @return
* If successful, returns a {@link Date} object representing the parsed
* date; otherwise, null.
*/
public static Date parseDate(String strdate)
{
Date result = null;
strdate = strdate.trim();
if (strdate.endsWith("Z")) {
strdate = strdate.substring(0, strdate.length() - 1) + "GMT";
}
if (strdate.length() > 10) {
// TODO deal with +4:00 (no zero before hour)
if ((strdate.substring(strdate.length() - 5).indexOf("+") == 0 || strdate
.substring(strdate.length() - 5).indexOf("-") == 0)
&& strdate.substring(strdate.length() - 5).indexOf(":") == 2) {
String sign = strdate.substring(strdate.length() - 5,
strdate.length() - 4);
strdate = strdate.substring(0, strdate.length() - 5) + sign + "0"
+ strdate.substring(strdate.length() - 4);
// logger.debug("CASE1 : new date " + strdate + " ? "
// + strdate.substring(0, strdate.length() - 5));
}
String dateEnd = strdate.substring(strdate.length() - 6);
// try to deal with -05:00 or +02:00 at end of date
// replace with -0500 or +0200
if ((dateEnd.indexOf("-") == 0 || dateEnd.indexOf("+") == 0)
&& dateEnd.indexOf(":") == 3) {
// TODO deal with GMT-00:03
if ("GMT".equals(strdate.substring(strdate.length() - 9, strdate
.length() - 6))) {
Log.d(TAG, "General time zone with offset, no change");
} else {
// continue treatment
String oldDate = strdate;
String newEnd = dateEnd.substring(0, 3) + dateEnd.substring(4);
strdate = oldDate.substring(0, oldDate.length() - 6) + newEnd;
// logger.debug("!!modifying string ->"+strdate);
}
}
}
int i = 0;
int dateFormatsLength = dateFormats.length;
while (i < dateFormatsLength) {
try {
result = dateFormats[i].parse(strdate);
// logger.debug("******Parsing Success "+strdate+"->"+result+" with
// "+dateFormats[i].toPattern());
break;
} catch (java.text.ParseException eA) {
i++;
}
}
return result;
}
/**
* Format a date in a manner that would be most suitable for serialized
* storage.
*
* @param date
* {@link Date} object to format.
*
* @return
* Robust, formatted date string.
*/
public static String formatDate(Date date)
{
return dateFormats[dateFormat_default].format(date);
}
}
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