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

        cal.set(1995, 0, 1, 5, 1, 29);
        Date expLittleD = cal.getTime();
        Date expBigD = new Date((long) (expLittleD.getTime() + 39 * 24 * 3600000.0));
        expLittleD = expBigD; // Expect the same, with default lenient parsing
        logln("dateString= " + dateString);
        SimpleDateFormat formatter = new SimpleDateFormat(bigD);
        ParsePosition pos = new ParsePosition(0);
        Date myDate = formatter.parse(dateString, pos);
        logln("Using " + bigD + " . " + myDate);
        if (!myDate.equals(expBigD))
            errln("FAIL: Expected " + expBigD);
        formatter = new SimpleDateFormat(littleD);
        pos = new ParsePosition(0);
        myDate = formatter.parse(dateString, pos);
        logln("Using " + littleD + " . " + myDate);
        if (!myDate.equals(expLittleD))
            errln("FAIL: Expected " + expLittleD);
    }

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        day = cal.get(Calendar.DAY_OF_MONTH);
        cal.clear();
        cal.set(year, month, day);
        Date expected = cal.getTime();
        logln("Test Date: " + today);
        SimpleDateFormat sdf = (SimpleDateFormat)DateFormat.getDateInstance();
        tryPattern(sdf, today, null, expected);
        tryPattern(sdf, today, "G yyyy DDD", expected);
    }

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    /**
     * Test the handling of single quotes in patterns.
     */
    public void TestQuotePattern161() {
        SimpleDateFormat formatter = new SimpleDateFormat("MM/dd/yyyy 'at' hh:mm:ss a zzz", Locale.US); 
        Calendar cal = Calendar.getInstance();
        cal.clear();
        cal.set(1997, Calendar.AUGUST, 13, 10, 42, 28);
        Date currentTime_1 = cal.getTime();
        String dateString = ((DateFormat) formatter).format(currentTime_1);

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     * array of patterns, with known results.  The results are encoded after
     * the input strings in each row.
     */
    public void TestBadInput135a() {
    
        SimpleDateFormat dateParse = new SimpleDateFormat("", Locale.US);
        final String ss;
        Date date;
        String[] parseFormats ={"MMMM d, yyyy", "MMMM d yyyy", "M/d/yy",
                                "d MMMM, yyyy", "d MMMM yyyy",  "d MMMM",
                                "MMMM d", "yyyy", "h:mm a MMMM d, yyyy" };
        String[] inputStrings = {
            "bogus string", null, null, null, null, null, null, null, null, null,
                "April 1, 1997", "April 1, 1997", null, null, null, null, null, "April 1", null, null,
                "Jan 1, 1970", "January 1, 1970", null, null, null, null, null, "January 1", null, null,
                "Jan 1 2037", null, "January 1 2037", null, null, null, null, "January 1", null, null,
                "1/1/70", null, null, "1/1/70", null, null, null, null, "0001", null,
                "5 May 1997", null, null, null, null, "5 May 1997", "5 May", null, "0005", null,
                "16 May", null, null, null, null, null, "16 May", null, "0016", null,
                "April 30", null, null, null, null, null, null, "April 30", null, null,
                "1998", null, null, null, null, null, null, null, "1998", null,
                "1", null, null, null, null, null, null, null, "0001", null,
                "3:00 pm Jan 1, 1997", null, null, null, null, null, null, null, "0003", "3:00 PM January 1, 1997",
                };
        final int PF_LENGTH = parseFormats.length;
        final int INPUT_LENGTH = inputStrings.length;
    
        dateParse.applyPattern("d MMMM, yyyy");
        dateParse.setTimeZone(TimeZone.getDefault());
        ss = "not parseable";
        //    String thePat;
        logln("Trying to parse \"" + ss + "\" with " + dateParse.toPattern());
        try {
            date = dateParse.parse(ss);
        } catch (Exception ex) {
            logln("FAIL:" + ex);
        }
        for (int i = 0; i < INPUT_LENGTH; i += (PF_LENGTH + 1)) {
            ParsePosition parsePosition = new ParsePosition(0);
            String s = inputStrings[i];
            for (int index = 0; index < PF_LENGTH; ++index) {
                final String expected = inputStrings[i + 1 + index];
                dateParse.applyPattern(parseFormats[index]);
                dateParse.setTimeZone(TimeZone.getDefault());
                try {
                    parsePosition.setIndex(0);
                    date = dateParse.parse(s, parsePosition);
                    if (parsePosition.getIndex() != 0) {
                        String s1, s2;
                        s1 = s.substring(0, parsePosition.getIndex());
                        s2 = s.substring(parsePosition.getIndex(), s.length());
                        if (date == null) {
                            errln("ERROR: null result fmt=\"" + parseFormats[index]
                                    + "\" pos=" + parsePosition.getIndex()
                                    + " " + s1 + "|" + s2);
                        } else {
                            String result = ((DateFormat) dateParse).format(date);
                            logln("Parsed \"" + s + "\" using \"" + dateParse.toPattern() + "\" to: " + result);
                            if (expected == null)
                                errln("FAIL: Expected parse failure");
                            else
                                if (!result.equals(expected))
                                    errln("FAIL: Expected " + expected);
                        }
                    } else
                        if (expected != null) {
                            errln("FAIL: Expected " + expected + " from \"" + s
                                    + "\" with \"" + dateParse.toPattern()+ "\"");
                        }
                } catch (Exception ex) {
                    logln("FAIL:" + ex);
                }
            }

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    public void TestDateFormatZone061() {
        Date date;
        DateFormat formatter;
        date = new Date(859248000000l);
        logln("Date 1997/3/25 00:00 GMT: " + date);
        formatter = new SimpleDateFormat("dd-MMM-yyyyy HH:mm", Locale.UK);
        formatter.setTimeZone(TimeZone.getTimeZone("GMT"));
        String temp = formatter.format(date);
        logln("Formatted in GMT to: " + temp);
        try {
            Date tempDate = formatter.parse(temp);

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                "short format:   ", "4/4/97 11:00 PM", 
                "M/d/yy h:mm a"}; 
        int DATA_length = DATA.length;
    
        for (int i = 0; i < DATA_length; i += 3) {
            DateFormat fmt = new SimpleDateFormat(DATA[i + 2], Locale.ENGLISH);
            fmt.setCalendar(greenwichcalendar);
            String result = fmt.format(greenwichdate);
            logln(DATA[i] + result);
            if (!result.equals(DATA[i + 1]))
                errln("FAIL: Expected " + DATA[i + 1] + ", got " + result);
        }
        //}

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        expectParse(DATA, new Locale("en", "", ""));
    }


    public void TestInvalidPattern() {
        Exception e = null;
        SimpleDateFormat f = null;
        String out = null;
        try {
            f = new SimpleDateFormat("Yesterday");
            out = f.format(new Date(0));
        } catch (IllegalArgumentException e1) {
            e = e1;
        }
        if (e != null) {
            logln("Ok: Received " + e.getMessage());
        } else {
            errln("FAIL: Expected exception, got " + f.toPattern() +
                  "; " + out);
        }
    }

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        }
    }


    public void TestGreekMay() {
        Date date = new Date(-9896080848000L);
        SimpleDateFormat fmt = new SimpleDateFormat("EEEE, dd MMMM yyyy h:mm:ss a",
                             new Locale("el", "", ""));
        String str = fmt.format(date);
        ParsePosition pos = new ParsePosition(0);
        Date d2 = fmt.parse(str, pos);
        if (!date.equals(d2)) {
            errln("FAIL: unable to parse strings where case-folding changes length");
        }
    }

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        catch(Exception e) {
            warnln("Expected IllegalArgumentException, got: " + e);
        }
        
        try {
            DateFormat df = new SimpleDateFormat("aabbccc");
            df.format(new Date());
            errln("Expected exception for format with bad pattern");
        }
        catch(IllegalArgumentException ex) {
            logln("two ok");
        }
        catch(Exception e) {
            warnln("Expected IllegalArgumentException, got: " + e);
        }
        
        {
            SimpleDateFormat fmt = new SimpleDateFormat("dd/MM/yy"); // opposite of text
            fmt.set2DigitYearStart(getDate(2003, Calendar.DECEMBER, 25));
            String text = "12/25/03";
            Calendar xcal = new GregorianCalendar();
            xcal.setLenient(false);
            ParsePosition pp = new ParsePosition(0);
            fmt.parse(text, xcal, pp); // should get parse error on second field, not lenient
            if (pp.getErrorIndex() == -1) {
                errln("Expected parse error");
            } else {
                logln("three ok");
            }

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        // jb 4904
        // make sure we can display localized versions of the chars used in the default
        // chinese date format patterns
        Calendar chineseCalendar = new ChineseCalendar();
        chineseCalendar.setTimeInMillis((new Date()).getTime());
        SimpleDateFormat longChineseDateFormat = 
            (SimpleDateFormat)chineseCalendar.getDateTimeFormat(DateFormat.LONG, DateFormat.LONG, Locale.CHINA );
        DateFormatSymbols dfs = new ChineseDateFormatSymbols( chineseCalendar, Locale.CHINA );
        longChineseDateFormat.setDateFormatSymbols( dfs );
        // This next line throws the exception
        try {
            longChineseDateFormat.toLocalizedPattern();
        }
        catch (Exception e) {
            errln("could not localized pattern: " + e.getMessage());
        }
    }

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Examples of com.ibm.icu.text.SimpleDateFormat

Synchronization

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