rfc2822 clarification on date headers

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rfc2822 clarification on date headers

rfc2822 clarification on date headers

2004-01-20 - By Donie Kelly

Back

Hi all

Javamail generates a date in the format: Date: Tue, 20 Jan 2004 11:57:37
+0000 (GMT)

The spec below implies that the timezone is either a numeric offset or the
timezone is specified like Date: Fri, 23 Jan 2004 11:57:24 GMT

Can somebody clarify why javamail uses both forms?
Extract from rfc2822 below

Thanks
Donie

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.

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<div class=Section1><pre>Hi all<o:p></o:p></pre><pre><![if
!supportEmptyParas]> <![endif]><o:p></o:p></pre><pre>Javamail generates a date in the format:  
Date: Tue, 20 Jan 2004 11:57:37 +0000 (GMT)<o:p></o:p></pre
><pre><![if
!supportEmptyParas]> <![endif]><o:p></o:p></pre><pre>The
spec below implies that the timezone is either a numeric offset or the timezone
is specified like Date: Fri, 23 Jan 2004 11:57:24 GMT<o:p></o:p><
/pre><pre><![if
!supportEmptyParas]> <![endif]><o:p></o:p></pre><pre>Can
somebody clarify why javamail uses both forms?<o:p></o:p></pre>
<pre>Extract from rfc2822 below<o:p></o:p></pre><pre><![if
!supportEmptyParas]> <![endif]><o:p></o:p></pre><pre>Thanks<o:p></o:p></pre><pre>Donie
<o:p></o:p></pre><pre><![if
!supportEmptyParas]> <![endif]><o:p></o:p></pre><pre><![if
!supportEmptyParas]> <![endif]><o:p></o:p></pre><pre>3.3.
Date and Time Specification<o:p></o:p></pre><pre><![if
!supportEmptyParas]> <![endif]><o:p></o:p></pre><pre>   Date and time occur in several
header fields.  This section
specifies<o:p></o:p></pre><pre>   the syntax for a full date and
time specification.  Though folding
<o:p></o:p></pre><pre>   white space is permitted
throughout the date-time specification, it<o:p></o:p></pre><pre>
   is RECOMMENDED that a single
space be used in each place that FWS<o:p></o:p></pre><pre>   appears (whether it is required
or optional); some older<o:p></o:p></pre><pre>   implementations may not interpret
other occurrences of folding white<o:p></o:p></pre><pre>   space correctly.<o:p></o:p></pre><pre><![if
!supportEmptyParas]> <![endif]><o:p></o:p></pre><pre>date
-time       =       [
day-of-week "," ] date FWS time [CFWS]<o:p></o:p></pre>
<pre><![if
!supportEmptyParas]> <![endif]><o:p></o:p></pre><pre>day
-of-week     =       ([FWS]
day-name) / obs-day-of-week<o:p></o:p></pre><pre><![if
!supportEmptyParas]> <![endif]><o:p></o:p></pre><pre>day
-name       
=       "Mon" / "Tue" / "Wed" / "Thu" /<o
:p></o:p></pre><pre>               
         "Fri" /
"Sat" / "Sun"<o:p></o:p></pre><pre><![if
!supportEmptyParas]> <![endif]><o:p></o:p></pre><pre>date
        
    =   
    day month year<o:p></o:p></pre><pre>
<![if
!supportEmptyParas]> <![endif]><o:p></o:p></pre><pre>year
        
    =   
    4*DIGIT / obs-year<o:p></o:p></pre><pre>
<![if
!supportEmptyParas]> <![endif]><o:p></o:p></pre><pre>month
        
   =    
   (FWS month-name FWS) / obs-month<o:p></o:p><
/pre><pre><![if
!supportEmptyParas]> <![endif]><o:p></o:p></pre><pre>month
-name      =
       
"Jan" / "Feb" / "Mar" / "Apr" /<o:p></o
:p></pre><pre>        &nbsp
;       
        "May" / &quot
;Jun" / "Jul" / "Aug" /<o:p></o:p></pre>
<pre>        &nbsp
;             
  "Sep" / "Oct" / "Nov" / "Dec
"<o:p></o:p></pre><pre><![if
!supportEmptyParas]> <![endif]><o:p></o:p></pre><pre>day
        
     =  
     ([FWS] 1*2DIGIT) / obs-day<o:p></o:p></pre><pre><![if
!supportEmptyParas]> <![endif]><o:p></o:p></pre><pre>time
        
    =   
    time-of-day FWS zone<o:p></o:p></pre>
<pre><![if
!supportEmptyParas]> <![endif]><o:p></o:p></pre><pre>time
-of-day     =       hour
":" minute [ ":" second ]<o:p></o:p></pre><pre
><![if
!supportEmptyParas]> <![endif]><o:p></o:p></pre><pre>hour
            =       2DIGIT / obs
-hour<o:p></o:p></pre><pre><![if
!supportEmptyParas]> <![endif]><o:p></o:p></pre><pre>minute      &nbsp
;   =    
   2DIGIT / obs-minute<o:p></o:p></pre><pre><![if
!supportEmptyParas]> <![endif]><o:p></o:p></pre><pre>second      &nbsp
;   =    
   2DIGIT / obs-second<o:p></o:p></pre><pre><![if
!supportEmptyParas]> <![endif]><o:p></o:p></pre><pre>zone
        
    =   
    (( "+" / "-" ) 4DIGIT) / obs-zone
<o:p></o:p></pre><pre><![if
!supportEmptyParas]> <![endif]><o:p></o:p></pre><pre>   The day is the numeric day of the
month.  The year is any numeric<o:p
></o:p></pre><pre>   year 1900 or later.<o:p></o:p></pre><pre><![if
!supportEmptyParas]> <![endif]><o:p></o:p></pre><pre>   The time-of-day specifies the
number of hours, minutes, and<o:p></o:p></pre><pre>   optionally seconds since midnight
of the date indicated.<o:p></o:p></pre><pre><![if
!supportEmptyParas]> <![endif]><o:p></o:p></pre><pre>   The date and time-of-day SHOULD
express local time.<o:p></o:p></pre><pre><![if
!supportEmptyParas]> <![endif]><o:p></o:p></pre><pre>   The zone specifies the offset
from Coordinated Universal Time (UTC,<o:p></o:p></pre><pre>   formerly referred to as &quot
;Greenwich Mean Time") that the date and<o:p></o:p></pre><pre
>   time-of-day represent.  The "+" or "-" indicates
whether the<o:p></o:p></pre><pre>   time-of-day is ahead of (i.e.,
east of) or behind (i.e., west of)<o:p></o:p></pre><pre>   Universal Time.  The first two digits indicate the number of hours
<o:p></o:p></pre><pre>   difference from Universal Time,
and the last two digits indicate the<o:p></o:p></pre><pre>   number of minutes difference from
Universal Time.  (Hence, +hhmm<o:p>
</o:p></pre><pre>   means +(hh * 60 + mm) minutes,
and -hhmm means -(hh * 60 + mm)<o:p></o:p></pre><pre>   minutes).  The form "+0000" SHOULD be used to
indicate a time zone at<o:p></o:p></pre><pre>   Universal Time.  Though "-0000" also indicates Universal
Time, it is<o:p></o:p></pre><pre>   used to indicate that the time
was generated on a system that may be<o:p></o:p></pre><pre>   in a local time zone other than
Universal Time and therefore<o:p></o:p></pre><pre>   indicates that the date-time
contains no information about the local<o:p></o:p></pre><pre>
   time zone.<o:p></o:p></pre><pre><![if
!supportEmptyParas]> <![endif]><o:p></o:p></pre><pre>   A date-time specification MUST be
semantically valid.  That is, the<o
:p></o:p></pre><pre>   day-of-the-week (if included)
MUST be the day implied by the date,<o:p></o:p></pre><pre>   the numeric day-of-month MUST be
between 1 and the number of days<o:p></o:p></pre><pre>   allowed for the specified month
(in the specified year), the<o:p></o:p></pre><pre>   time-of-day MUST be in the range
00:00:00 through 23:59:60 (the<o:p></o:p></pre><pre>   number of seconds allowing for a
leap second; see [STD12]), and the<o:p></o:p></pre><pre>   zone MUST be within the range
-9959 through +9959.<o:p></o:p></pre>

<![if
!supportEmptyParas]> <![endif]><o:p></o:p>

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