[Chapter 29] 29.18 java.text.SimpleDateFormat (JDK 1.1)

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| Chapter 29 The java.text Package |

## 29.18 java.text.SimpleDateFormat (JDK 1.1)

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This is the concrete `Format` subclass used by `DateFormat` to handle formatting and parsing of dates. Most applications should not use this class directly--instead, they should obtain a localized `DateFormat` object by calling one of the static methods of `DateFormat`.

`SimpleDateFormat` formats dates and times according to a pattern, which specifies the positions of the various fields of the date, and a `DateFormatSymbols` object, which specifies important auxiliary data, such as the names of months. Applications that require highly customized date or time formatting can create a custom `SimpleDateFormat` object by specifying the desired pattern. This creates a `SimpleDateFormat` object that uses the `DateFormatSymbols` object for the default locale. You may also specify a locale explicitly to use the `DateFormatSymbols` object for that locale. Or, you can even provide an explicit `DateFormatSymbols` object of your own, if you need to format dates and times for an unsupported locale.

You can use the `applyPattern()` method of a `SimpleDateFormat` to change the formatting pattern used by the object. The syntax of this pattern is described in the following table. Any characters in the format string that do not appear in this table appear literally in the formatted date.

Field | Full Form | Short Form
--- | --- | ---
Year | `yyyy` (4 digits) | `yy` (2 digits)
Month | `MMM` (name) | `MM` (2 digits), `M` (1 or 2 digits)
Day of week | `EEEE` | `EE`
Day of month | `dd` (2 digits) | `d` (1 or 2 digits)
Hour (1-12) | `hh` (2 digits) | `h` (1 or 2 digits)
Hour (0-23) | `HH` (2 digits) | `H` (1 or 2 digits)
Hour (0-11) | `KK` | `K`
Hour (1-24) | `kk` | `k`
Minute | `mm` |
Second | `ss` |
Millisecond | `SSS` |
AM/PM | `a` |
Time zone | `zzzz` | `zz`
Day of week in month | `F` (e.g., 3rd Thursday) |
Day in year | `DDD` (3 digits) | `D` (1, 2, or 3 digits)
Week in year | `ww` | ``
Era (e.g., BC/AD) | G |

    public class SimpleDateFormat extends DateFormat {
        // Public Constructors
                public SimpleDateFormat();
                public SimpleDateFormat(String pattern);
                public SimpleDateFormat(String pattern, Locale loc);
                public SimpleDateFormat(String pattern, DateFormatSymbols formatData);
        // Public Instance Methods
                public void applyLocalizedPattern(String pattern);
                public void applyPattern(String pattern);
                public Object clone();  // Overrides DateFormat
                public boolean equals(Object obj);  // Overrides DateFormat
                public StringBuffer format(Date date, StringBuffer toAppendTo, FieldPosition pos);  // Defines DateFormat
                public DateFormatSymbols getDateFormatSymbols();
                public int hashCode();  // Overrides DateFormat
                public Date parse(String text, ParsePosition pos);  // Defines DateFormat
                public void setDateFormatSymbols(DateFormatSymbols newFormatSymbols);
                public String toLocalizedPattern();
                public String toPattern();
    }

### Hierarchy:

Object->Format(Serializable, Cloneable)->DateFormat(Cloneable)->SimpleDateFormat

java.text.RuleBasedCollator (JDK 1.1) |  | java.text.StringCharacterIterator (JDK 1.1)