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## org.apache.commons.httpclient.util
Class DateUtil

    java.lang.Object
      org.apache.commons.httpclient.util.DateUtil

    public class DateUtil

extends Object

A utility class for parsing and formatting HTTP dates as used in cookies and other headers. This class handles dates as defined by RFC 2616 section 3.3.1 as well as some other common non-standard formats.

Author:
  Christopher Brown, Michael Becke

Field Summary
`static String` | `PATTERN_ASCTIME` Date format pattern used to parse HTTP date headers in ANSI C `asctime()` format.
`static String` | `PATTERN_RFC1036` Date format pattern used to parse HTTP date headers in RFC 1036 format.
`static String` | `PATTERN_RFC1123` Date format pattern used to parse HTTP date headers in RFC 1123 format.

Method Summary
`static String` | `formatDate(Date date)` Formats the given date according to the RFC 1123 pattern.
`static String` | `formatDate(Date date, String pattern)` Formats the given date according to the specified pattern.
`static Date` | `parseDate(String dateValue)` Parses a date value.
`static Date` | `parseDate(String dateValue, Collection dateFormats)` Parses the date value using the given date formats.
`static Date` | `parseDate(String dateValue, Collection dateFormats, Date startDate)` Parses the date value using the given date formats.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Field Detail

### PATTERN_RFC1123

    public static final String PATTERN_RFC1123

  Date format pattern used to parse HTTP date headers in RFC 1123 format.

  See Also:
    Constant Field Values

### PATTERN_RFC1036

    public static final String PATTERN_RFC1036

  Date format pattern used to parse HTTP date headers in RFC 1036 format.

  See Also:
    Constant Field Values

### PATTERN_ASCTIME

    public static final String PATTERN_ASCTIME

  Date format pattern used to parse HTTP date headers in ANSI C `asctime()` format.

  See Also:
    Constant Field Values

Method Detail

### parseDate

    public static Date parseDate(String dateValue)
                          throws DateParseException

  Parses a date value. The formats used for parsing the date value are retrieved from the default http params.

  Parameters:
    `dateValue` - the date value to parse
  Returns:
    the parsed date
  Throws:
    `DateParseException` - if the value could not be parsed using any of the supported date formats

### parseDate

    public static Date parseDate(String dateValue,
                                 Collection dateFormats)
                          throws DateParseException

  Parses the date value using the given date formats.

  Parameters:
    `dateValue` - the date value to parse
    `dateFormats` - the date formats to use
  Returns:
    the parsed date
  Throws:
    `DateParseException` - if none of the dataFormats could parse the dateValue

### parseDate

    public static Date parseDate(String dateValue,
                                 Collection dateFormats,
                                 Date startDate)
                          throws DateParseException

  Parses the date value using the given date formats.

  Parameters:
    `dateValue` - the date value to parse
    `dateFormats` - the date formats to use
    `startDate` - During parsing, two digit years will be placed in the range `startDate` to `startDate + 100 years`. This value may be `null`. When `null` is given as a parameter, year `2000` will be used.
  Returns:
    the parsed date
  Throws:
    `DateParseException` - if none of the dataFormats could parse the dateValue

### formatDate

    public static String formatDate(Date date)

  Formats the given date according to the RFC 1123 pattern.

  Parameters:
    `date` - The date to format.
  Returns:
    An RFC 1123 formatted date string.
  See Also:
    `PATTERN_RFC1123`

### formatDate

    public static String formatDate(Date date,
                                    String pattern)

  Formats the given date according to the specified pattern. The pattern must conform to that used by the `simple date format` class.

  Parameters:
    `date` - The date to format.
    `pattern` - The pattern to use for formatting the date.
  Returns:
    A formatted date string.
  Throws:
    `IllegalArgumentException` - If the given date pattern is invalid.
  See Also:
    `SimpleDateFormat`

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