Examples of com.ibm.icu.text.SimpleDateFormat

com.ibm.icu.text.SimpleDateFormat
at the current time. SimpleDateFormat formatter = new SimpleDateFormat ("yyyy.MM.dd G 'at' hh:mm:ss a zzz"); Date currentTime_1 = new Date(); String dateString = formatter.format(currentTime_1);
// Parse the previous string back into a Date. ParsePosition pos = new ParsePosition(0); Date currentTime_2 = formatter.parse(dateString, pos); In the example, the time value currentTime_2 obtained from parsing will be equal to currentTime_1. However, they may not be equal if the am/pm marker 'a' is left out from the format pattern while the "hour in am/pm" pattern symbol is used. This information loss can happen when formatting the time in PM.
When parsing a date string using the abbreviated year pattern ("yy"), SimpleDateFormat must interpret the abbreviated year relative to some century. It does this by adjusting dates to be within 80 years before and 20 years after the time the SimpleDateFormat instance is created. For example, using a pattern of "MM/dd/yy" and a SimpleDateFormat instance created on Jan 1, 1997, the string "01/11/12" would be interpreted as Jan 11, 2012 while the string "05/04/64" would be interpreted as May 4, 1964. During parsing, only strings consisting of exactly two digits, as defined by {@link java.lang.Character#isDigit(char)}, will be parsed into the default century. Any other numeric string, such as a one digit string, a three or more digit string, or a two digit string that isn't all digits (for example, "-1"), is interpreted literally. So "01/02/3" or "01/02/003" are parsed, using the same pattern, as Jan 2, 3 AD. Likewise, "01/02/-3" is parsed as Jan 2, 4 BC.
If the year pattern does not have exactly two 'y' characters, the year is interpreted literally, regardless of the number of digits. So using the pattern "MM/dd/yyyy", "01/11/12" parses to Jan 11, 12 A.D.
When numeric fields abut one another directly, with no intervening delimiter characters, they constitute a run of abutting numeric fields. Such runs are parsed specially. For example, the format "HHmmss" parses the input text "123456" to 12:34:56, parses the input text "12345" to 1:23:45, and fails to parse "1234". In other words, the leftmost field of the run is flexible, while the others keep a fixed width. If the parse fails anywhere in the run, then the leftmost field is shortened by one character, and the entire run is parsed again. This is repeated until either the parse succeeds or the leftmost field is one character in length. If the parse still fails at that point, the parse of the run fails.
For time zones that have no names, use strings GMT+hours:minutes or GMT-hours:minutes.
The calendar defines what is the first day of the week, the first week of the year, whether hours are zero based or not (0 vs 12 or 24), and the time zone. There is one common decimal format to handle all the numbers; the digit count is handled programmatically according to the pattern.
Synchronization
Date formats are not synchronized. It is recommended to create separate format instances for each thread. If multiple threads access a format concurrently, it must be synchronized externally. @see com.ibm.icu.util.Calendar @see com.ibm.icu.util.GregorianCalendar @see com.ibm.icu.util.TimeZone @see DateFormat @see DateFormatSymbols @see DecimalFormat @author Mark Davis, Chen-Lieh Huang, Alan Liu @stable ICU 2.0

    String rfc850_date = "EEEE, dd-MMM-yy hh:mm:ss 'GMT'";
    String asctime_date = "EEE MMM d hh:mm:ss yyyy";


    try
    {
      SimpleDateFormat sdf = new SimpleDateFormat(rfc1123_date, Locale.US);
      if (sdf.parse(value) != null)
        return true;
    }
    catch (ParseException e)
    {
    }


    try
    {
      SimpleDateFormat sdf = new SimpleDateFormat(rfc850_date, Locale.US);
      if (sdf.parse(value) != null)
        return true;
    }
    catch (ParseException e)
    {
    }


    try
    {
      SimpleDateFormat sdf = new SimpleDateFormat(asctime_date, Locale.US);
      if (sdf.parse(value) != null)
        return true;
    }
    catch (ParseException e)
    {
    }

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        }
        return isReserve;
    }


    public static String convertDate(Date date, Locale locale) {
        SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSS'Z'",locale);
        return simpleDateFormat.format(date);
    }

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        String productStoreId = (String) context.get("productStoreId");
        try {
            Calendar fromDate = Calendar.getInstance();
            Calendar toDate = Calendar.getInstance();
            if (UtilValidate.isNotEmpty(context.get("thruDate"))) {
                SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss.SSS");
                dateFormat.parse(context.get("fromDate").toString());
                fromDate.setTime(dateFormat.parse(context.get("fromDate").toString()));


                SimpleDateFormat dateFormat2 = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss.SSS");
                dateFormat2.parse(context.get("thruDate").toString());
                toDate.setTime(dateFormat.parse(context.get("thruDate").toString()));
            } else {
                toDate.setTime(UtilDateTime.nowDate());
                fromDate = null;
            }

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        ApiContext apiContext = EbayStoreHelper.getApiContext(productStoreId, locale, delegator);
        try {
            Calendar fromDate = Calendar.getInstance();
            Calendar toDate = Calendar.getInstance();
            if (UtilValidate.isNotEmpty(context.get("thruDate"))) {
                SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss.SSS");
                dateFormat.parse(context.get("fromDate").toString());
                fromDate.setTime(dateFormat.parse(context.get("fromDate").toString()));


                SimpleDateFormat dateFormat2 = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss.SSS");
                dateFormat2.parse(context.get("thruDate").toString());
                toDate.setTime(dateFormat.parse(context.get("thruDate").toString()));
            } else {
                toDate.setTime(UtilDateTime.nowDate());
                fromDate = null;
            }

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        ULocale locale = ULocale.GERMANY;
        TimeZone zone = TimeZone.getTimeZone("Europe/Paris");
        
        // make from locale
        DateTimePatternGenerator gen = DateTimePatternGenerator.getInstance(locale);
        SimpleDateFormat format = new SimpleDateFormat(gen.getBestPattern("MMMddHmm"), locale);
        format.setTimeZone(zone);
        assertEquals("simple format: MMMddHmm", "14. Okt 8:58", format.format(sampleDate));
        // (a generator can be built from scratch, but that is not a typical use case)


        // modify the generator by adding patterns
        DateTimePatternGenerator.PatternInfo returnInfo = new DateTimePatternGenerator.PatternInfo();
        gen.addPattern("d'. von' MMMM", true, returnInfo); 
        // the returnInfo is mostly useful for debugging problem cases
        format.applyPattern(gen.getBestPattern("MMMMddHmm"));
        assertEquals("modified format: MMMddHmm", "14. von Oktober 8:58", format.format(sampleDate));


        // get a pattern and modify it
        format = (SimpleDateFormat)DateFormat.getDateTimeInstance(DateFormat.FULL, DateFormat.FULL, locale);
        format.setTimeZone(zone);
        String pattern = format.toPattern();
        assertEquals("full-date", "Donnerstag, 14. Oktober 1999 08:58:59 Mitteleurop\u00E4ische Sommerzeit", format.format(sampleDate));


        // modify it to change the zone.
        String newPattern = gen.replaceFieldTypes(pattern, "vvvv");
        format.applyPattern(newPattern);
        assertEquals("full-date: modified zone", "Donnerstag, 14. Oktober 1999 08:58:59 Frankreich", format.format(sampleDate));
        
        // add test of basic cases


        //lang  YYYYMMM MMMd    MMMdhmm hmm hhmm    Full Date-Time
        // en  Mar 2007    Mar 4   6:05 PM Mar 4   6:05 PM 06:05 PM    Sunday, March 4, 2007 6:05:05 PM PT
        DateTimePatternGenerator enGen = DateTimePatternGenerator.getInstance(ULocale.ENGLISH);
        TimeZone enZone = TimeZone.getTimeZone("Etc/GMT");
        SimpleDateFormat enFormat = (SimpleDateFormat)DateFormat.getDateTimeInstance(DateFormat.FULL, DateFormat.FULL, ULocale.ENGLISH);
        enFormat.setTimeZone(enZone);
        String[][] tests = {
              {"yyyyMMMdd", "Oct 14, 1999"},
              {"yyyyqqqq", "4th quarter 1999"},
              {"yMMMdd", "Oct 14, 1999"},
              {"EyyyyMMMdd", "Thu, Oct 14, 1999"},
              {"yyyyMMdd", "10/14/1999"},
              {"yyyyMMM", "Oct 1999"},
              {"yyyyMM", "10/1999"},
              {"yyMM", "10/99"},
              {"yMMMMMd", "O 14, 1999"},  // narrow format
              {"EEEEEMMMMMd", "T, O 14"},  // narrow format
              {"MMMd", "Oct 14"},
              {"MMMdhmm", "Oct 14 6:58 AM"},
              {"EMMMdhmms", "Thu, Oct 14 6:58:59 AM"},
              {"MMdhmm", "10/14 6:58 AM"},
              {"EEEEMMMdhmms", "Thursday, Oct 14 6:58:59 AM"},
              {"yyyyMMMddhhmmss", "Oct 14, 1999 06:58:59 AM"},
              {"EyyyyMMMddhhmmss", "Thu, Oct 14, 1999 06:58:59 AM"},
              {"hmm", "6:58 AM"},
              {"hhmm", "06:58 AM"},
              {"hhmmVVVV", "06:58 AM GMT+00:00"},
        };
        for (int i = 0; i < tests.length; ++i) {
            final String testSkeleton = tests[i][0];
            String pat = enGen.getBestPattern(testSkeleton);
            enFormat.applyPattern(pat);
            String formattedDate = enFormat.format(sampleDate);
            assertEquals("Testing skeleton '" + testSkeleton + "' with  " + sampleDate, tests[i][1], formattedDate);
        }
    }

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        }
    }


    public void TestRoot() {
        DateTimePatternGenerator rootGen = DateTimePatternGenerator.getInstance(ULocale.ROOT);
        SimpleDateFormat rootFormat = new SimpleDateFormat(rootGen.getBestPattern("yMdHms"), ULocale.ROOT);
        rootFormat.setTimeZone(gmt);
        assertEquals("root format: yMdHms", "1999-10-14 6:58:59", rootFormat.format(sampleDate));
    }

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    }
    
    public void TestEmpty() {
        // now nothing
        DateTimePatternGenerator nullGen = DateTimePatternGenerator.getEmptyInstance();
        SimpleDateFormat format = new SimpleDateFormat(nullGen.getBestPattern("yMdHms"), ULocale.ROOT);
        TimeZone rootZone = TimeZone.getTimeZone("Etc/GMT");
        format.setTimeZone(rootZone);
    }

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                date = (Date) dateTestData[i];
                if (GENERATE_TEST_DATA) logln("new Date(" + date.getTime()+ "L),");
            } else if (dateTestData[i] instanceof String) {
                String testSkeleton = (String) dateTestData[i];
                String pattern = dtfg.getBestPattern(testSkeleton);
                SimpleDateFormat sdf = new SimpleDateFormat(pattern, uLocale);
                String formatted = sdf.format(date);
                if (GENERATE_TEST_DATA) logln("new String[] {\"" + testSkeleton + "\", \"" + Utility.escape(formatted) + "\"},");
                //logln(uLocale + "\t" + testSkeleton + "\t" + pattern + "\t" + sdf.format(date));
            } else {
                String[] testPair = (String[]) dateTestData[i];
                String testSkeleton = testPair[0];
                String testFormatted = testPair[1];
                String pattern = dtfg.getBestPattern(testSkeleton);
                SimpleDateFormat sdf = new SimpleDateFormat(pattern, uLocale);
                String formatted = sdf.format(date);
                if (GENERATE_TEST_DATA) {
                    logln("new String[] {\"" + testSkeleton + "\", \"" + Utility.escape(formatted) + "\"},");
                } else if (!formatted.equals(testFormatted)) {
                    errln(uLocale + "\tformatted string doesn't match test case: " + testSkeleton + "\t generated: " +  pattern + "\t expected: " + testFormatted + "\t got: " + formatted);
                    if (true) { // debug
                        pattern = dtfg.getBestPattern(testSkeleton);
                        sdf = new SimpleDateFormat(pattern, uLocale);
                        formatted = sdf.format(date);
                    }
                }
                //logln(uLocale + "\t" + testSkeleton + "\t" + pattern + "\t" + sdf.format(date));
            }
        }

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        DateTimePatternGenerator dtpgen
          = DateTimePatternGenerator.getInstance(locale);
        
        // get a pattern for an abbreviated month and day
        final String pattern = dtpgen.getBestPattern("MMMd");
        SimpleDateFormat formatter = new SimpleDateFormat(pattern, locale);
        
        // use it to format (or parse)
        String formatted = formatter.format(new Date());
        logln("formatted=" + formatted);
        // for French, the result is "13 sept."
    }

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            logln(locales[i].toString());
            DateTimePatternGenerator dtpgen
            = DateTimePatternGenerator.getInstance(locales[i]);
            
            for (int style1 = DateFormat.FULL; style1 <= DateFormat.SHORT; ++style1) {
                final SimpleDateFormat oldFormat = (SimpleDateFormat) DateFormat.getTimeInstance(style1, locales[i]);
                String pattern = oldFormat.toPattern();
                String newPattern = dtpgen.replaceFieldTypes(pattern, "VVVV"); // replaceZoneString(pattern, "VVVV");
                if (newPattern.equals(pattern)) {
                    continue;
                }
                // verify that it roundtrips parsing
                SimpleDateFormat newFormat = new SimpleDateFormat(newPattern, locales[i]);
                newFormat.setTimeZone(testTimeZone);
                String formatted = newFormat.format(testDate);
                calendar.setTimeZone(bogusTimeZone);
                parsePosition.setIndex(0);
                newFormat.parse(formatted, calendar, parsePosition);
                if (parsePosition.getErrorIndex() >= 0) {
                    errln("Failed parse with VVVV:\t" + locales[i] + ",\t\"" + pattern + "\",\t\"" + newPattern + "\",\t\"" + formatted.substring(0,parsePosition.getErrorIndex()) + "{}" + formatted.substring(parsePosition.getErrorIndex()) + "\"");
                } else if (!calendar.getTimeZone().getID().equals(testTimeZone.getID())) {
                    errln("Failed timezone roundtrip with VVVV:\t" + locales[i] + ",\t\"" + pattern + "\",\t\"" + newPattern + "\",\t\"" + formatted + "\",\t" + calendar.getTimeZone().getID() + " != " + testTimeZone.getID());
                } else {

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Examples of com.ibm.icu.text.SimpleDateFormat

Synchronization

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