Module jakarta.mail
Package jakarta.mail.internet

Class MailDateFormat

  • All Implemented Interfaces:
    java.io.Serializable, java.lang.Cloneable
    public class MailDateFormat
extends java.text.SimpleDateFormat
    Formats and parses date specification based on RFC 2822.

    This class does not support methods that influence the format. It always formats the date based on the specification below.

    3.3. Date and Time Specification

    Date and time occur in several header fields. This section specifies the syntax for a full date and time specification. Though folding white space is permitted throughout the date-time specification, it is RECOMMENDED that a single space be used in each place that FWS appears (whether it is required or optional); some older implementations may not interpret other occurrences of folding white space correctly. 

     date-time       =       [ day-of-week "," ] date FWS time [CFWS]

 day-of-week     =       ([FWS] day-name) / obs-day-of-week

 day-name        =       "Mon" / "Tue" / "Wed" / "Thu" /
                         "Fri" / "Sat" / "Sun"

 date            =       day month year

 year            =       4*DIGIT / obs-year

 month           =       (FWS month-name FWS) / obs-month

 month-name      =       "Jan" / "Feb" / "Mar" / "Apr" /
                         "May" / "Jun" / "Jul" / "Aug" /
                         "Sep" / "Oct" / "Nov" / "Dec"

 day             =       ([FWS] 1*2DIGIT) / obs-day

 time            =       time-of-day FWS zone

 time-of-day     =       hour ":" minute [ ":" second ]

 hour            =       2DIGIT / obs-hour

 minute          =       2DIGIT / obs-minute

 second          =       2DIGIT / obs-second

 zone            =       (( "+" / "-" ) 4DIGIT) / obs-zone
    The day is the numeric day of the month. The year is any numeric year 1900 or later.

    The time-of-day specifies the number of hours, minutes, and optionally seconds since midnight of the date indicated.

    The date and time-of-day SHOULD express local time.

    The zone specifies the offset from Coordinated Universal Time (UTC, formerly referred to as "Greenwich Mean Time") that the date and time-of-day represent. The "+" or "-" indicates whether the time-of-day is ahead of (i.e., east of) or behind (i.e., west of) Universal Time. The first two digits indicate the number of hours difference from Universal Time, and the last two digits indicate the number of minutes difference from Universal Time. (Hence, +hhmm means +(hh * 60 + mm) minutes, and -hhmm means -(hh * 60 + mm) minutes). The form "+0000" SHOULD be used to indicate a time zone at Universal Time. Though "-0000" also indicates Universal Time, it is used to indicate that the time was generated on a system that may be in a local time zone other than Universal Time and therefore indicates that the date-time contains no information about the local time zone.

    A date-time specification MUST be semantically valid. That is, the day-of-the-week (if included) MUST be the day implied by the date, the numeric day-of-month MUST be between 1 and the number of days allowed for the specified month (in the specified year), the time-of-day MUST be in the range 00:00:00 through 23:59:60 (the number of seconds allowing for a leap second; see [STD12]), and the zone MUST be within the range -9959 through +9959.

    Synchronization

    Date formats are not synchronized. It is recommended to create separate format instances for each thread. If multiple threads access a format concurrently, it must be synchronized externally.

    Author:
    Anthony Vanelverdinghe, Max Spivak
    See Also:
    Serialized Form

    • Nested Class Summary

      • Nested classes/interfaces inherited from class java.text.DateFormat

        java.text.DateFormat.Field

    • Field Summary

      • Fields inherited from class java.text.DateFormat

        AM_PM_FIELD, calendar, DATE_FIELD, DAY_OF_WEEK_FIELD, DAY_OF_WEEK_IN_MONTH_FIELD, DAY_OF_YEAR_FIELD, DEFAULT, ERA_FIELD, FULL, HOUR_OF_DAY0_FIELD, HOUR_OF_DAY1_FIELD, HOUR0_FIELD, HOUR1_FIELD, LONG, MEDIUM, MILLISECOND_FIELD, MINUTE_FIELD, MONTH_FIELD, numberFormat, SECOND_FIELD, SHORT, TIMEZONE_FIELD, WEEK_OF_MONTH_FIELD, WEEK_OF_YEAR_FIELD, YEAR_FIELD

    • Constructor Summary

      Constructors 
      Constructor Description
      MailDateFormat()
      Create a new date format for the RFC2822 specification with lenient parsing.

    • Method Summary

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      void applyLocalizedPattern​(java.lang.String pattern)
      This method always throws an UnsupportedOperationException and should not be used because RFC 2822 mandates a specific pattern.
      void applyPattern​(java.lang.String pattern)
      This method always throws an UnsupportedOperationException and should not be used because RFC 2822 mandates a specific pattern.
      MailDateFormat clone()
      Overrides Cloneable.
      java.lang.StringBuffer format​(java.util.Date date, java.lang.StringBuffer dateStrBuf, java.text.FieldPosition fieldPosition)
      Formats the given date in the format specified by RFC 2822 in the current TimeZone.
      java.util.Date get2DigitYearStart()
      This method always throws an UnsupportedOperationException and should not be used because RFC 2822 mandates another strategy for interpreting 2-digits years.
      java.util.Date parse​(java.lang.String text, java.text.ParsePosition pos)
      Parses the given date in the format specified by RFC 2822.
      void set2DigitYearStart​(java.util.Date startDate)
      This method always throws an UnsupportedOperationException and should not be used because RFC 2822 mandates another strategy for interpreting 2-digits years.
      void setCalendar​(java.util.Calendar newCalendar)
      This method always throws an UnsupportedOperationException and should not be used because RFC 2822 mandates a specific calendar.
      void setDateFormatSymbols​(java.text.DateFormatSymbols newFormatSymbols)
      This method always throws an UnsupportedOperationException and should not be used because RFC 2822 mandates specific date format symbols.
      void setNumberFormat​(java.text.NumberFormat newNumberFormat)
      This method always throws an UnsupportedOperationException and should not be used because RFC 2822 mandates a specific number format.

      • Methods inherited from class java.text.SimpleDateFormat

        equals, formatToCharacterIterator, getDateFormatSymbols, hashCode, toLocalizedPattern, toPattern

      • Methods inherited from class java.text.DateFormat

        format, format, getAvailableLocales, getCalendar, getDateInstance, getDateInstance, getDateInstance, getDateTimeInstance, getDateTimeInstance, getDateTimeInstance, getInstance, getNumberFormat, getTimeInstance, getTimeInstance, getTimeInstance, getTimeZone, isLenient, parse, parseObject, setLenient, setTimeZone

      • Methods inherited from class java.text.Format

        format, parseObject

      • Methods inherited from class java.lang.Object

        finalize, getClass, notify, notifyAll, toString, wait, wait, wait

    • Constructor Detail

      • MailDateFormat

        public MailDateFormat()
        Create a new date format for the RFC2822 specification with lenient parsing.

    • Method Detail

      • clone

        public MailDateFormat clone()
        Overrides Cloneable.
        Overrides:
        clone in class java.text.SimpleDateFormat
        Returns:
        a clone of this instance

      • format

        public java.lang.StringBuffer format​(java.util.Date date,
                                     java.lang.StringBuffer dateStrBuf,
                                     java.text.FieldPosition fieldPosition)
        Formats the given date in the format specified by RFC 2822 in the current TimeZone.
        Overrides:
        format in class java.text.SimpleDateFormat
        Parameters:
        date - the Date object
        dateStrBuf - the formatted string
        fieldPosition - the current field position
        Returns:
        StringBuffer the formatted String

      • parse

        public java.util.Date parse​(java.lang.String text,
                            java.text.ParsePosition pos)
        Parses the given date in the format specified by RFC 2822.
        • With strict parsing, obs-* tokens are unsupported. Lenient parsing supports obs-year and obs-zone, with the exception of the 1-character military time zones.
        • The optional CFWS token at the end is not parsed.
        • RFC 2822 specifies that a zone of "-0000" indicates that the date-time contains no information about the local time zone. This class uses the UTC time zone in this case.
        Overrides:
        parse in class java.text.SimpleDateFormat
        Parameters:
        text - the formatted date to be parsed
        pos - the current parse position
        Returns:
        Date the parsed date. In case of error, returns null.

      • setCalendar

        public void setCalendar​(java.util.Calendar newCalendar)
        This method always throws an UnsupportedOperationException and should not be used because RFC 2822 mandates a specific calendar.
        Overrides:
        setCalendar in class java.text.DateFormat
        Throws:
        java.lang.UnsupportedOperationException - if this method is invoked

      • setNumberFormat

        public void setNumberFormat​(java.text.NumberFormat newNumberFormat)
        This method always throws an UnsupportedOperationException and should not be used because RFC 2822 mandates a specific number format.
        Overrides:
        setNumberFormat in class java.text.DateFormat
        Throws:
        java.lang.UnsupportedOperationException - if this method is invoked

      • applyLocalizedPattern

        public void applyLocalizedPattern​(java.lang.String pattern)
        This method always throws an UnsupportedOperationException and should not be used because RFC 2822 mandates a specific pattern.
        Overrides:
        applyLocalizedPattern in class java.text.SimpleDateFormat
        Throws:
        java.lang.UnsupportedOperationException - if this method is invoked

      • applyPattern

        public void applyPattern​(java.lang.String pattern)
        This method always throws an UnsupportedOperationException and should not be used because RFC 2822 mandates a specific pattern.
        Overrides:
        applyPattern in class java.text.SimpleDateFormat
        Throws:
        java.lang.UnsupportedOperationException - if this method is invoked

      • get2DigitYearStart

        public java.util.Date get2DigitYearStart()
        This method always throws an UnsupportedOperationException and should not be used because RFC 2822 mandates another strategy for interpreting 2-digits years.
        Overrides:
        get2DigitYearStart in class java.text.SimpleDateFormat
        Returns:
        the start of the 100-year period into which two digit years are parsed
        Throws:
        java.lang.UnsupportedOperationException - if this method is invoked

      • set2DigitYearStart

        public void set2DigitYearStart​(java.util.Date startDate)
        This method always throws an UnsupportedOperationException and should not be used because RFC 2822 mandates another strategy for interpreting 2-digits years.
        Overrides:
        set2DigitYearStart in class java.text.SimpleDateFormat
        Throws:
        java.lang.UnsupportedOperationException - if this method is invoked

      • setDateFormatSymbols

        public void setDateFormatSymbols​(java.text.DateFormatSymbols newFormatSymbols)
        This method always throws an UnsupportedOperationException and should not be used because RFC 2822 mandates specific date format symbols.
        Overrides:
        setDateFormatSymbols in class java.text.SimpleDateFormat
        Throws:
        java.lang.UnsupportedOperationException - if this method is invoked