org.apache.hc.client5.http.utils

Class DateUtils

java.lang.Object

org.apache.hc.client5.http.utils.DateUtils

public final class DateUtils
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.

Since:

4.3

Field Summary

Fields

Modifier and Type	Field and Description
static TimeZone	GMT
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

Modifier and Type	Method and Description
static void	clearThreadLocal() Clears thread-local variable containing DateFormat cache.
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 boolean	isAfter(MessageHeaders message1, MessageHeaders message2, String headerName) Tests if the first message is after (newer) than second one using the given message header for comparison.
static boolean	isBefore(MessageHeaders message1, MessageHeaders message2, String headerName) Tests if the first message is before (older) than the second one using the given message header for comparison.
static Date	parseDate(MessageHeaders headers, String headerName) Parses a date value from a header with the given name.
static Date	parseDate(String dateValue) Parses a date value.
static Date	parseDate(String dateValue, String[] dateFormats) Parses the date value using the given date formats.
static Date	parseDate(String dateValue, String[] dateFormats, Date startDate) Parses the date value using the given date formats.

Methods inherited from class java.lang.Object

clone, equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

GMT

public static final TimeZone GMT

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

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_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

Method Detail

clearThreadLocal

public static void clearThreadLocal()

Clears thread-local variable containing DateFormat cache.

Since:

4.3

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

isAfter

public static boolean isAfter(MessageHeaders message1,
                              MessageHeaders message2,
                              String headerName)

Tests if the first message is after (newer) than second one using the given message header for comparison.

Parameters:

message1 - the first message

message2 - the second message

headerName - header name

Returns:

true if both messages contain a header with the given name and the value of the header from the first message is newer that of the second message.

Since:

5.0

isBefore

public static boolean isBefore(MessageHeaders message1,
                               MessageHeaders message2,
                               String headerName)

Tests if the first message is before (older) than the second one using the given message header for comparison.

Parameters:

message1 - the first message

message2 - the second message

headerName - header name

Returns:

true if both messages contain a header with the given name and the value of the header from the first message is older that of the second message.

Since:

5.0

parseDate

public static Date parseDate(MessageHeaders headers,
                             String headerName)

Parses a date value from a header with the given name.

Parameters:

headers - message headers

headerName - header name

Returns:

the parsed date or null if input could not be parsed

Since:

5.0

parseDate

public static Date parseDate(String dateValue)

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 or null if input could not be parsed

parseDate

public static Date parseDate(String dateValue,
                             String[] dateFormats)

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 or null if input could not be parsed

parseDate

public static Date parseDate(String dateValue,
                             String[] dateFormats,
                             Date startDate)

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 or null if input could not be parsed