Examples of org.threeten.bp.format.DateTimeFormatter

org.threeten.bp.format.DateTimeFormatter
Formatter for printing and parsing date-time objects.
This class provides the main application entry point for printing and parsing. Common instances of {@code DateTimeFormatter} are provided:
- Using pattern letters, such as {@code yyyy-MMM-dd}
- Using localized styles, such as {@code long} or {@code medium}
- Using predefined constants, such as {@link #ISO_LOCAL_DATE}
For more complex formatters, a {@link DateTimeFormatterBuilder builder} is provided.
In most cases, it is not necessary to use this class directly when formatting. The main date-time classes provide two methods - one for formatting, {@code format(DateTimeFormatter formatter)}, and one for parsing, For example:
```
 String text = date.format(formatter); LocalDate date = LocalDate.parse(text, formatter); 
```
Some aspects of printing and parsing are dependent on the locale. The locale can be changed using the {@link #withLocale(Locale)} methodwhich returns a new formatter in the requested locale.
Some applications may need to use the older {@link Format} class for formatting.The {@link #toFormat()} method returns an implementation of the old API.
Specification for implementors
This class is immutable and thread-safe.

    //-----------------------------------------------------------------------
    // parse(DateTimeFormatter)
    //-----------------------------------------------------------------------
    @Test
    public void factory_parse_formatter() {
        DateTimeFormatter f = DateTimeFormatter.ofPattern("u M d H m s VV");
        ZonedDateTime test = ZonedDateTime.parse("2010 12 3 11 30 0 Europe/London", f);
        assertEquals(test, ZonedDateTime.of(LocalDateTime.of(2010, 12, 3, 11, 30), ZoneId.of("Europe/London")));
    }

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        assertEquals(test, ZonedDateTime.of(LocalDateTime.of(2010, 12, 3, 11, 30), ZoneId.of("Europe/London")));
    }


    @Test(expectedExceptions=NullPointerException.class)
    public void factory_parse_formatter_nullText() {
        DateTimeFormatter f = DateTimeFormatter.ofPattern("y M d H m s");
        ZonedDateTime.parse((String) null, f);
    }

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    //-----------------------------------------------------------------------
    // format(DateTimeFormatter)
    //-----------------------------------------------------------------------
    @Test
    public void test_format_formatter() {
        DateTimeFormatter f = DateTimeFormatter.ofPattern("y M d H m s");
        String t = ZonedDateTime.of(dateTime(2010, 12, 3, 11, 30), ZONE_PARIS).format(f);
        assertEquals(t, "2010 12 3 11 30 0");
    }

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    }


    //-----------------------------------------------------------------------
    @Test
    public void test_parse_fromField_InstantSeconds() {
        DateTimeFormatter fmt = new DateTimeFormatterBuilder()
            .appendValue(INSTANT_SECONDS).toFormatter();
        TemporalAccessor acc = fmt.parse("86402");
        Instant expected = Instant.ofEpochSecond(86402);
        assertEquals(acc.isSupported(INSTANT_SECONDS), true);
        assertEquals(acc.isSupported(NANO_OF_SECOND), true);
        assertEquals(acc.isSupported(MICRO_OF_SECOND), true);
        assertEquals(acc.isSupported(MILLI_OF_SECOND), true);

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        assertEquals(Instant.from(acc), expected);
    }


    @Test
    public void test_parse_fromField_InstantSeconds_NanoOfSecond() {
        DateTimeFormatter fmt = new DateTimeFormatterBuilder()
            .appendValue(INSTANT_SECONDS).appendLiteral('.').appendValue(NANO_OF_SECOND).toFormatter();
        TemporalAccessor acc = fmt.parse("86402.123456789");
        Instant expected = Instant.ofEpochSecond(86402, 123456789);
        assertEquals(acc.isSupported(INSTANT_SECONDS), true);
        assertEquals(acc.isSupported(NANO_OF_SECOND), true);
        assertEquals(acc.isSupported(MICRO_OF_SECOND), true);
        assertEquals(acc.isSupported(MILLI_OF_SECOND), true);

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        assertEquals(Instant.from(acc), expected);
    }


    @Test
    public void test_parse_fromField_SecondOfDay() {
        DateTimeFormatter fmt = new DateTimeFormatterBuilder()
            .appendValue(SECOND_OF_DAY).toFormatter();
        TemporalAccessor acc = fmt.parse("864");
        assertEquals(acc.isSupported(SECOND_OF_DAY), true);
        assertEquals(acc.isSupported(NANO_OF_SECOND), true);
        assertEquals(acc.isSupported(MICRO_OF_SECOND), true);
        assertEquals(acc.isSupported(MILLI_OF_SECOND), true);
        assertEquals(acc.getLong(SECOND_OF_DAY), 864L);

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        assertEquals(acc.getLong(MILLI_OF_SECOND), 0L);
    }


    @Test
    public void test_parse_fromField_SecondOfDay_NanoOfSecond() {
        DateTimeFormatter fmt = new DateTimeFormatterBuilder()
            .appendValue(SECOND_OF_DAY).appendLiteral('.').appendValue(NANO_OF_SECOND).toFormatter();
        TemporalAccessor acc = fmt.parse("864.123456789");
        assertEquals(acc.isSupported(SECOND_OF_DAY), true);
        assertEquals(acc.isSupported(NANO_OF_SECOND), true);
        assertEquals(acc.isSupported(MICRO_OF_SECOND), true);
        assertEquals(acc.isSupported(MILLI_OF_SECOND), true);
        assertEquals(acc.getLong(SECOND_OF_DAY), 864L);

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        assertEquals(acc.getLong(MILLI_OF_SECOND), 123L);
    }


    @Test
    public void test_parse_fromField_SecondOfMinute() {
        DateTimeFormatter fmt = new DateTimeFormatterBuilder()
            .appendValue(SECOND_OF_MINUTE).toFormatter();
        TemporalAccessor acc = fmt.parse("32");
        assertEquals(acc.isSupported(SECOND_OF_MINUTE), true);
        assertEquals(acc.isSupported(NANO_OF_SECOND), true);
        assertEquals(acc.isSupported(MICRO_OF_SECOND), true);
        assertEquals(acc.isSupported(MILLI_OF_SECOND), true);
        assertEquals(acc.getLong(SECOND_OF_MINUTE), 32L);

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        assertEquals(acc.getLong(MILLI_OF_SECOND), 0L);
    }


    @Test
    public void test_parse_fromField_SecondOfMinute_NanoOfSecond() {
        DateTimeFormatter fmt = new DateTimeFormatterBuilder()
            .appendValue(SECOND_OF_MINUTE).appendLiteral('.').appendValue(NANO_OF_SECOND).toFormatter();
        TemporalAccessor acc = fmt.parse("32.123456789");
        assertEquals(acc.isSupported(SECOND_OF_MINUTE), true);
        assertEquals(acc.isSupported(NANO_OF_SECOND), true);
        assertEquals(acc.isSupported(MICRO_OF_SECOND), true);
        assertEquals(acc.isSupported(MILLI_OF_SECOND), true);
        assertEquals(acc.getLong(SECOND_OF_MINUTE), 32L);

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    //-----------------------------------------------------------------------
    // parse(DateTimeFormatter)
    //-----------------------------------------------------------------------
    @Test
    public void factory_parse_formatter() {
        DateTimeFormatter f = DateTimeFormatter.ofPattern("M d");
        MonthDay test = MonthDay.parse("12 3", f);
        assertEquals(test, MonthDay.of(12, 3));
    }

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Examples of org.threeten.bp.format.DateTimeFormatter

Specification for implementors

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