email: Support obsolete date and time.

* email/email.scm (obs-day-of-week, obs-day, obs-year, obs-hour,
obs-minute, obs-second, obs-zone): New macros.
(day-of-week, day, year, hours, minutes, seconds, zone): Include
obsolete pattern.
(parse-email-headers): Handle obsolete two and three digit years, and
alphabetic time zone specifiers.
* tests/email.scm ("RFC5322 A.6.2. Obsolete dates"): New test.

1 files changed, 28 insertions, 0 deletions

diff --git a/tests/email.scm b/tests/email.scm
index 8a7be9b..d3801a9 100644
--- a/tests/email.scm
+++ b/tests/email.scm
@@ -215,6 +215,34 @@ Hi everyone.
      (content-transfer-encoding . 7bit))
    "Hi everyone."))
 
+(test-email= "RFC5322 A.6.2. Obsolete dates"
+  (parse-email
+   (string->bytevector
+    "From: John Doe <jdoe@machine.example>
+To: Mary Smith <mary@example.net>
+Subject: Saying Hello
+Date: 21 Nov 97 09:55:06 GMT
+Message-ID: <1234@local.machine.example>
+
+This is a message just to say hello.
+So, \"Hello\".
+"
+    "utf-8"))
+  (make-email
+   `((from ((name . "John Doe")
+            (address . "jdoe@machine.example")))
+     (to ((name . "Mary Smith")
+          (address . "mary@example.net")))
+     (subject . "Saying Hello")
+     (date . ,(make-date 0 6 55 9 21 11 1997 0))
+     (message-id . "1234@local.machine.example")
+     (content-type (type . text)
+                   (subtype . plain)
+                   (charset . "utf-8"))
+     (content-transfer-encoding . 7bit))
+   "This is a message just to say hello.
+So, \"Hello\"."))
+
 (test-email= "RFC2046 5.1.1. Common syntax"
   (parse-email
    (string->bytevector