FastDateFormat (Apache Commons Lang 3.4 API)

java.lang.Object
- java.text.Format
- - org.apache.commons.lang3.time.FastDateFormat

All Implemented Interfaces:

Serializable, Cloneable, DateParser, DatePrinter
```
public class FastDateFormat
extends Format
implements DateParser, DatePrinter
```
FastDateFormat is a fast and thread-safe version of SimpleDateFormat.

To obtain an instance of FastDateFormat, use one of the static factory methods: getInstance(String, TimeZone, Locale), getDateInstance(int, TimeZone, Locale), getTimeInstance(int, TimeZone, Locale), or getDateTimeInstance(int, int, TimeZone, Locale)

Since FastDateFormat is thread safe, you can use a static member instance:
private static final FastDateFormat DATE_FORMATTER = FastDateFormat.getDateTimeInstance(FastDateFormat.LONG, FastDateFormat.SHORT);
This class can be used as a direct replacement to SimpleDateFormat in most formatting and parsing situations. This class is especially useful in multi-threaded server environments. SimpleDateFormat is not thread-safe in any JDK version, nor will it be as Sun have closed the bug/RFE.

All patterns are compatible with SimpleDateFormat (except time zones and some year patterns - see below).

Since 3.2, FastDateFormat supports parsing as well as printing.

Java 1.4 introduced a new pattern letter, 'Z', to represent time zones in RFC822 format (eg. +0800 or -1100). This pattern letter can be used here (on all JDK versions).

In addition, the pattern 'ZZ' has been made to represent ISO 8601 full format time zones (eg. +08:00 or -11:00). This introduces a minor incompatibility with Java 1.4, but at a gain of useful functionality.

Javadoc cites for the year pattern: For formatting, if the number of pattern letters is 2, the year is truncated to 2 digits; otherwise it is interpreted as a number. Starting with Java 1.7 a pattern of 'Y' or 'YYY' will be formatted as '2003', while it was '03' in former Java versions. FastDateFormat implements the behavior of Java 7.

Since:

2.0

Version:

$Id: FastDateFormat.java 1591488 2014-04-30 21:49:35Z ggregory $

See Also:
Serialized Form

Nested Class Summary
- Nested classes/interfaces inherited from class java.text.Format
  Format.Field

Field Summary

Fields
Modifier and Type	Field and Description
`static int`	`FULL` FULL locale dependent date or time style.
`static int`	`LONG` LONG locale dependent date or time style.
`static int`	`MEDIUM` MEDIUM locale dependent date or time style.
`static int`	`SHORT` SHORT locale dependent date or time style.

Constructor Summary

Constructors
Modifier	Constructor and Description
`protected`	`FastDateFormat(String pattern, TimeZone timeZone, Locale locale)` Constructs a new FastDateFormat.
`protected`	`FastDateFormat(String pattern, TimeZone timeZone, Locale locale, Date centuryStart)` Constructs a new FastDateFormat.

Method Summary

Methods
Modifier and Type	Method and Description
`protected StringBuffer`	`applyRules(Calendar calendar, StringBuffer buf)` Performs the formatting by applying the rules to the specified calendar.
`boolean`	`equals(Object obj)` Compares two objects for equality.
`String`	`format(Calendar calendar)` Formats a `Calendar` object.
`StringBuffer`	`format(Calendar calendar, StringBuffer buf)` Formats a `Calendar` object into the supplied `StringBuffer`.
`String`	`format(Date date)` Formats a `Date` object using a `GregorianCalendar`.
`StringBuffer`	`format(Date date, StringBuffer buf)` Formats a `Date` object into the supplied `StringBuffer` using a `GregorianCalendar`.
`String`	`format(long millis)` Formats a millisecond `long` value.
`StringBuffer`	`format(long millis, StringBuffer buf)` Formats a millisecond `long` value into the supplied `StringBuffer`.
`StringBuffer`	`format(Object obj, StringBuffer toAppendTo, FieldPosition pos)` Formats a `Date`, `Calendar` or `Long` (milliseconds) object.
`static FastDateFormat`	`getDateInstance(int style)` Gets a date formatter instance using the specified style in the default time zone and locale.
`static FastDateFormat`	`getDateInstance(int style, Locale locale)` Gets a date formatter instance using the specified style and locale in the default time zone.
`static FastDateFormat`	`getDateInstance(int style, TimeZone timeZone)` Gets a date formatter instance using the specified style and time zone in the default locale.
`static FastDateFormat`	`getDateInstance(int style, TimeZone timeZone, Locale locale)` Gets a date formatter instance using the specified style, time zone and locale.
`static FastDateFormat`	`getDateTimeInstance(int dateStyle, int timeStyle)` Gets a date/time formatter instance using the specified style in the default time zone and locale.
`static FastDateFormat`	`getDateTimeInstance(int dateStyle, int timeStyle, Locale locale)` Gets a date/time formatter instance using the specified style and locale in the default time zone.
`static FastDateFormat`	`getDateTimeInstance(int dateStyle, int timeStyle, TimeZone timeZone)` Gets a date/time formatter instance using the specified style and time zone in the default locale.
`static FastDateFormat`	`getDateTimeInstance(int dateStyle, int timeStyle, TimeZone timeZone, Locale locale)` Gets a date/time formatter instance using the specified style, time zone and locale.
`static FastDateFormat`	`getInstance()` Gets a formatter instance using the default pattern in the default locale.
`static FastDateFormat`	`getInstance(String pattern)` Gets a formatter instance using the specified pattern in the default locale.
`static FastDateFormat`	`getInstance(String pattern, Locale locale)` Gets a formatter instance using the specified pattern and locale.
`static FastDateFormat`	`getInstance(String pattern, TimeZone timeZone)` Gets a formatter instance using the specified pattern and time zone.
`static FastDateFormat`	`getInstance(String pattern, TimeZone timeZone, Locale locale)` Gets a formatter instance using the specified pattern, time zone and locale.
`Locale`	`getLocale()` Gets the locale used by this formatter.
`int`	`getMaxLengthEstimate()` Gets an estimate for the maximum string length that the formatter will produce.
`String`	`getPattern()` Gets the pattern used by this formatter.
`static FastDateFormat`	`getTimeInstance(int style)` Gets a time formatter instance using the specified style in the default time zone and locale.
`static FastDateFormat`	`getTimeInstance(int style, Locale locale)` Gets a time formatter instance using the specified style and locale in the default time zone.
`static FastDateFormat`	`getTimeInstance(int style, TimeZone timeZone)` Gets a time formatter instance using the specified style and time zone in the default locale.
`static FastDateFormat`	`getTimeInstance(int style, TimeZone timeZone, Locale locale)` Gets a time formatter instance using the specified style, time zone and locale.
`TimeZone`	`getTimeZone()` Gets the time zone used by this formatter.
`int`	`hashCode()` Returns a hashcode compatible with equals.
`Date`	`parse(String source)` Equivalent to DateFormat.parse(String).
`Date`	`parse(String source, ParsePosition pos)` Equivalent to DateFormat.parse(String, ParsePosition).
`Object`	`parseObject(String source, ParsePosition pos)` Parse a date/time string according to the given parse position.
`String`	`toString()` Gets a debugging string version of this formatter.

Methods inherited from class java.text.Format
clone, format, formatToCharacterIterator, parseObject

Methods inherited from class java.lang.Object
finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.apache.commons.lang3.time.DateParser
parseObject

- Field Detail
  - FULL
```
public static final int FULL
```
    FULL locale dependent date or time style.
    
    See Also:
    Constant Field Values
  - LONG
```
public static final int LONG
```
    LONG locale dependent date or time style.
    
    See Also:
    Constant Field Values
  - MEDIUM
```
public static final int MEDIUM
```
    MEDIUM locale dependent date or time style.
    
    See Also:
    Constant Field Values
  - SHORT
```
public static final int SHORT
```
    SHORT locale dependent date or time style.
    
    See Also:
    Constant Field Values
- Constructor Detail
  - FastDateFormat
```
protected FastDateFormat(String pattern,
              TimeZone timeZone,
              Locale locale)
```
    Constructs a new FastDateFormat.
    
    Parameters:
    pattern - SimpleDateFormat compatible pattern
    timeZone - non-null time zone to use
    locale - non-null locale to use
    
    Throws:
    
    NullPointerException - if pattern, timeZone, or locale is null.
  - FastDateFormat
```
protected FastDateFormat(String pattern,
              TimeZone timeZone,
              Locale locale,
              Date centuryStart)
```
    Constructs a new FastDateFormat.
    
    Parameters:
    pattern - SimpleDateFormat compatible pattern
    timeZone - non-null time zone to use
    locale - non-null locale to use
    centuryStart - The start of the 100 year period to use as the "default century" for 2 digit year parsing. If centuryStart is null, defaults to now - 80 years
    
    Throws:
    
    NullPointerException - if pattern, timeZone, or locale is null.
- Method Detail
  - getInstance
```
public static FastDateFormat getInstance()
```
    Gets a formatter instance using the default pattern in the default locale.
    
    Returns:
    a date/time formatter
  - getInstance
```
public static FastDateFormat getInstance(String pattern)
```
    Gets a formatter instance using the specified pattern in the default locale.
    
    Parameters:
    pattern - SimpleDateFormat compatible pattern
    
    Returns:
    a pattern based date/time formatter
    
    Throws:
    
    IllegalArgumentException - if pattern is invalid
  - getInstance
```
public static FastDateFormat getInstance(String pattern,
                         TimeZone timeZone)
```
    Gets a formatter instance using the specified pattern and time zone.
    
    Parameters:
    pattern - SimpleDateFormat compatible pattern
    timeZone - optional time zone, overrides time zone of formatted date
    
    Returns:
    a pattern based date/time formatter
    
    Throws:
    
    IllegalArgumentException - if pattern is invalid
  - getInstance
```
public static FastDateFormat getInstance(String pattern,
                         Locale locale)
```
    Gets a formatter instance using the specified pattern and locale.
    
    Parameters:
    pattern - SimpleDateFormat compatible pattern
    locale - optional locale, overrides system locale
    
    Returns:
    a pattern based date/time formatter
    
    Throws:
    
    IllegalArgumentException - if pattern is invalid
  - getInstance
```
public static FastDateFormat getInstance(String pattern,
                         TimeZone timeZone,
                         Locale locale)
```
    Gets a formatter instance using the specified pattern, time zone and locale.
    
    Parameters:
    pattern - SimpleDateFormat compatible pattern
    timeZone - optional time zone, overrides time zone of formatted date
    locale - optional locale, overrides system locale
    
    Returns:
    a pattern based date/time formatter
    
    Throws:
    
    IllegalArgumentException - if pattern is invalid or null
  - getDateInstance
```
public static FastDateFormat getDateInstance(int style)
```
    Gets a date formatter instance using the specified style in the default time zone and locale.
    
    Parameters:
    style - date style: FULL, LONG, MEDIUM, or SHORT
    
    Returns:
    a localized standard date formatter
    
    Throws:
    
    IllegalArgumentException - if the Locale has no date pattern defined
    Since:
    
    2.1
  - getDateInstance
```
public static FastDateFormat getDateInstance(int style,
                             Locale locale)
```
    Gets a date formatter instance using the specified style and locale in the default time zone.
    
    Parameters:
    style - date style: FULL, LONG, MEDIUM, or SHORT
    locale - optional locale, overrides system locale
    
    Returns:
    a localized standard date formatter
    
    Throws:
    
    IllegalArgumentException - if the Locale has no date pattern defined
    Since:
    
    2.1
  - getDateInstance
```
public static FastDateFormat getDateInstance(int style,
                             TimeZone timeZone)
```
    Gets a date formatter instance using the specified style and time zone in the default locale.
    
    Parameters:
    style - date style: FULL, LONG, MEDIUM, or SHORT
    timeZone - optional time zone, overrides time zone of formatted date
    
    Returns:
    a localized standard date formatter
    
    Throws:
    
    IllegalArgumentException - if the Locale has no date pattern defined
    Since:
    
    2.1
  - getDateInstance
```
public static FastDateFormat getDateInstance(int style,
                             TimeZone timeZone,
                             Locale locale)
```
    Gets a date formatter instance using the specified style, time zone and locale.
    
    Parameters:
    style - date style: FULL, LONG, MEDIUM, or SHORT
    timeZone - optional time zone, overrides time zone of formatted date
    locale - optional locale, overrides system locale
    
    Returns:
    a localized standard date formatter
    
    Throws:
    
    IllegalArgumentException - if the Locale has no date pattern defined
  - getTimeInstance
```
public static FastDateFormat getTimeInstance(int style)
```
    Gets a time formatter instance using the specified style in the default time zone and locale.
    
    Parameters:
    style - time style: FULL, LONG, MEDIUM, or SHORT
    
    Returns:
    a localized standard time formatter
    
    Throws:
    
    IllegalArgumentException - if the Locale has no time pattern defined
    Since:
    
    2.1
  - getTimeInstance
```
public static FastDateFormat getTimeInstance(int style,
                             Locale locale)
```
    Gets a time formatter instance using the specified style and locale in the default time zone.
    
    Parameters:
    style - time style: FULL, LONG, MEDIUM, or SHORT
    locale - optional locale, overrides system locale
    
    Returns:
    a localized standard time formatter
    
    Throws:
    
    IllegalArgumentException - if the Locale has no time pattern defined
    Since:
    
    2.1
  - getTimeInstance
```
public static FastDateFormat getTimeInstance(int style,
                             TimeZone timeZone)
```
    Gets a time formatter instance using the specified style and time zone in the default locale.
    
    Parameters:
    style - time style: FULL, LONG, MEDIUM, or SHORT
    timeZone - optional time zone, overrides time zone of formatted time
    
    Returns:
    a localized standard time formatter
    
    Throws:
    
    IllegalArgumentException - if the Locale has no time pattern defined
    Since:
    
    2.1
  - getTimeInstance
```
public static FastDateFormat getTimeInstance(int style,
                             TimeZone timeZone,
                             Locale locale)
```
    Gets a time formatter instance using the specified style, time zone and locale.
    
    Parameters:
    style - time style: FULL, LONG, MEDIUM, or SHORT
    timeZone - optional time zone, overrides time zone of formatted time
    locale - optional locale, overrides system locale
    
    Returns:
    a localized standard time formatter
    
    Throws:
    
    IllegalArgumentException - if the Locale has no time pattern defined
  - getDateTimeInstance
```
public static FastDateFormat getDateTimeInstance(int dateStyle,
                                 int timeStyle)
```
    Gets a date/time formatter instance using the specified style in the default time zone and locale.
    
    Parameters:
    dateStyle - date style: FULL, LONG, MEDIUM, or SHORT
    timeStyle - time style: FULL, LONG, MEDIUM, or SHORT
    
    Returns:
    a localized standard date/time formatter
    
    Throws:
    
    IllegalArgumentException - if the Locale has no date/time pattern defined
    Since:
    
    2.1
  - getDateTimeInstance
```
public static FastDateFormat getDateTimeInstance(int dateStyle,
                                 int timeStyle,
                                 Locale locale)
```
    Gets a date/time formatter instance using the specified style and locale in the default time zone.
    
    Parameters:
    dateStyle - date style: FULL, LONG, MEDIUM, or SHORT
    timeStyle - time style: FULL, LONG, MEDIUM, or SHORT
    locale - optional locale, overrides system locale
    
    Returns:
    a localized standard date/time formatter
    
    Throws:
    
    IllegalArgumentException - if the Locale has no date/time pattern defined
    Since:
    
    2.1
  - getDateTimeInstance
```
public static FastDateFormat getDateTimeInstance(int dateStyle,
                                 int timeStyle,
                                 TimeZone timeZone)
```
    Gets a date/time formatter instance using the specified style and time zone in the default locale.
    
    Parameters:
    dateStyle - date style: FULL, LONG, MEDIUM, or SHORT
    timeStyle - time style: FULL, LONG, MEDIUM, or SHORT
    timeZone - optional time zone, overrides time zone of formatted date
    
    Returns:
    a localized standard date/time formatter
    
    Throws:
    
    IllegalArgumentException - if the Locale has no date/time pattern defined
    Since:
    
    2.1
  - getDateTimeInstance
```
public static FastDateFormat getDateTimeInstance(int dateStyle,
                                 int timeStyle,
                                 TimeZone timeZone,
                                 Locale locale)
```
    Gets a date/time formatter instance using the specified style, time zone and locale.
    
    Parameters:
    dateStyle - date style: FULL, LONG, MEDIUM, or SHORT
    timeStyle - time style: FULL, LONG, MEDIUM, or SHORT
    timeZone - optional time zone, overrides time zone of formatted date
    locale - optional locale, overrides system locale
    
    Returns:
    a localized standard date/time formatter
    
    Throws:
    
    IllegalArgumentException - if the Locale has no date/time pattern defined
  - format
```
public StringBuffer format(Object obj,
                  StringBuffer toAppendTo,
                  FieldPosition pos)
```
    Formats a Date, Calendar or Long (milliseconds) object.
    
    Specified by:
    
    format in interface DatePrinter
    
    Specified by:
    
    format in class Format
    
    Parameters:
    obj - the object to format
    toAppendTo - the buffer to append to
    pos - the position - ignored
    
    Returns:
    the buffer passed in
  - format
```
public String format(long millis)
```
    Formats a millisecond long value.
    
    Specified by:
    
    format in interface DatePrinter
    
    Parameters:
    millis - the millisecond value to format
    
    Returns:
    the formatted string
    Since:
    
    2.1
  - format
```
public String format(Date date)
```
    Formats a Date object using a GregorianCalendar.
    
    Specified by:
    
    format in interface DatePrinter
    
    Parameters:
    date - the date to format
    
    Returns:
    the formatted string
  - format
```
public String format(Calendar calendar)
```
    Formats a Calendar object.
    
    Specified by:
    
    format in interface DatePrinter
    
    Parameters:
    calendar - the calendar to format
    
    Returns:
    the formatted string
  - format
```
public StringBuffer format(long millis,
                  StringBuffer buf)
```
    Formats a millisecond long value into the supplied StringBuffer.
    
    Specified by:
    
    format in interface DatePrinter
    
    Parameters:
    millis - the millisecond value to format
    buf - the buffer to format into
    
    Returns:
    the specified string buffer
    Since:
    
    2.1
  - format
```
public StringBuffer format(Date date,
                  StringBuffer buf)
```
    Formats a Date object into the supplied StringBuffer using a GregorianCalendar.
    
    Specified by:
    
    format in interface DatePrinter
    
    Parameters:
    date - the date to format
    buf - the buffer to format into
    
    Returns:
    the specified string buffer
  - format
```
public StringBuffer format(Calendar calendar,
                  StringBuffer buf)
```
    Formats a Calendar object into the supplied StringBuffer.
    
    Specified by:
    
    format in interface DatePrinter
    
    Parameters:
    calendar - the calendar to format
    buf - the buffer to format into
    
    Returns:
    the specified string buffer
  - parse
```
public Date parse(String source)
           throws ParseException
```
    Description copied from interface: DateParser
    
    Equivalent to DateFormat.parse(String). See DateFormat.parse(String) for more information.
    
    Specified by:
    
    parse in interface DateParser
    
    Parameters:
    source - A String whose beginning should be parsed.
    
    Returns:
    A Date parsed from the string
    
    Throws:
    
    ParseException - if the beginning of the specified string cannot be parsed.
  - parse
```
public Date parse(String source,
         ParsePosition pos)
```
    Description copied from interface: DateParser
    
    Equivalent to DateFormat.parse(String, ParsePosition). See DateFormat.parse(String, ParsePosition) for more information.
    
    Specified by:
    
    parse in interface DateParser
    
    Parameters:
    source - A String, part of which should be parsed.
    pos - A ParsePosition object with index and error index information as described above.
    
    Returns:
    A Date parsed from the string. In case of error, returns null.
  - parseObject
```
public Object parseObject(String source,
                 ParsePosition pos)
```
    Description copied from interface: DateParser
    
    Parse a date/time string according to the given parse position.
    
    Specified by:
    
    parseObject in interface DateParser
    
    Specified by:
    
    parseObject in class Format
    
    Parameters:
    source - A String whose beginning should be parsed.
    pos - the parse position
    
    Returns:
    a java.util.Date object
    See Also:
    DateFormat.parseObject(String, ParsePosition)
  - getPattern
```
public String getPattern()
```
    Gets the pattern used by this formatter.
    
    Specified by:
    
    getPattern in interface DateParser
    
    Specified by:
    
    getPattern in interface DatePrinter
    
    Returns:
    the pattern, SimpleDateFormat compatible
  - getTimeZone
```
public TimeZone getTimeZone()
```
    Gets the time zone used by this formatter.
    
    This zone is always used for Date formatting.
    
    Specified by:
    
    getTimeZone in interface DateParser
    
    Specified by:
    
    getTimeZone in interface DatePrinter
    
    Returns:
    the time zone
  - getLocale
```
public Locale getLocale()
```
    Gets the locale used by this formatter.
    
    Specified by:
    
    getLocale in interface DateParser
    
    Specified by:
    
    getLocale in interface DatePrinter
    
    Returns:
    the locale
  - getMaxLengthEstimate
```
public int getMaxLengthEstimate()
```
    Gets an estimate for the maximum string length that the formatter will produce.
    
    The actual formatted length will almost always be less than or equal to this amount.
    
    Returns:
    the maximum formatted length
  - equals
```
public boolean equals(Object obj)
```
    Compares two objects for equality.
    
    Overrides:
    
    equals in class Object
    
    Parameters:
    obj - the object to compare to
    
    Returns:
    true if equal
  - hashCode
```
public int hashCode()
```
    Returns a hashcode compatible with equals.
    
    Overrides:
    
    hashCode in class Object
    
    Returns:
    a hashcode compatible with equals
  - toString
```
public String toString()
```
    Gets a debugging string version of this formatter.
    
    Overrides:
    
    toString in class Object
    
    Returns:
    a debugging string
  - applyRules
```
protected StringBuffer applyRules(Calendar calendar,
                      StringBuffer buf)
```
    Performs the formatting by applying the rules to the specified calendar.
    
    Parameters:
    calendar - the calendar to format
    buf - the buffer to format into
    
    Returns:
    the specified string buffer

Class FastDateFormat

Nested Class Summary

Nested classes/interfaces inherited from class java.text.Format

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.text.Format

Methods inherited from class java.lang.Object

Methods inherited from interface org.apache.commons.lang3.time.DateParser

Field Detail

FULL

LONG

MEDIUM

SHORT

Constructor Detail

FastDateFormat

FastDateFormat

Method Detail

getInstance

getInstance

getInstance

getInstance

getInstance

getDateInstance

getDateInstance

getDateInstance

getDateInstance

getTimeInstance

getTimeInstance

getTimeInstance

getTimeInstance

getDateTimeInstance

getDateTimeInstance

getDateTimeInstance

getDateTimeInstance

format

format

format

format

format

format

format

parse

parse

parseObject

getPattern

getTimeZone

getLocale

getMaxLengthEstimate

equals

hashCode

toString

applyRules