## org.apache.solr.common.util
Class DateUtil

    java.lang.Object
      org.apache.solr.common.util.DateUtil

    public class DateUtil

extends Object

This class has some code from HttpClient DateUtil.

Field Summary
`static Collection<String>` `DEFAULT_DATE_FORMATS` A suite of default date formats that can be parsed, and thus transformed to the Solr specific format
`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.
`static TimeZone` `UTC`

Constructor Summary
`DateUtil()`

Method Summary
`static Calendar` `formatDate(Date date, Calendar cal, Appendable out)` Formats the date and returns the calendar instance that was used (which may be reused)
`static DateFormat` `getThreadLocalDateFormat()` Returns a formatter that can be use by the current thread if needed to convert Date objects to the Internal representation.
`static Date` `parseDate(String d)` Returns a formatter that can be use by the current thread if needed to convert Date objects to the Internal representation.
`static Date` `parseDate(String d, Collection<String> fmts)`
`static Date` `parseDate(String dateValue, Collection<String> dateFormats, Date startDate)` Slightly modified from org.apache.commons.httpclient.util.DateUtil.parseDate 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

### DEFAULT_DATE_FORMATS

    public static final Collection<String> DEFAULT_DATE_FORMATS

  A suite of default date formats that can be parsed, and thus transformed to the Solr specific format

### UTC

    public static TimeZone UTC

Constructor Detail

### DateUtil

    public DateUtil()

Method Detail

### parseDate

    public static Date parseDate(String d)
                          throws ParseException

  Returns a formatter that can be use by the current thread if needed to convert Date objects to the Internal representation.

  Parameters:
    `d` - The input date to parse
  Returns:
    The parsed `Date`
  Throws:
    `ParseException` - If the input can't be parsed

### parseDate

    public static Date parseDate(String d,
                                 Collection<String> fmts)
                          throws ParseException

  Throws:
    `ParseException`

### parseDate

    public static Date parseDate(String dateValue,
                                 Collection<String> dateFormats,
                                 Date startDate)
                          throws ParseException

  Slightly modified from org.apache.commons.httpclient.util.DateUtil.parseDate

  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:
    `ParseException` - if none of the dataFormats could parse the dateValue

### getThreadLocalDateFormat

    public static DateFormat getThreadLocalDateFormat()

  Returns a formatter that can be use by the current thread if needed to convert Date objects to the Internal representation.

  Returns:
    The `DateFormat` for the current thread

### formatDate

    public static Calendar formatDate(Date date,
                                      Calendar cal,
                                      Appendable out)
                               throws IOException

  Formats the date and returns the calendar instance that was used (which may be reused)

  Throws:
    `IOException`

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