Feature added by Bill van Melle: when no timezone is present, assume
local time -- that's better than failure.
diff --git a/Doc/librfc822.tex b/Doc/librfc822.tex
index aa7e459..d764ce6 100644
--- a/Doc/librfc822.tex
+++ b/Doc/librfc822.tex
@@ -47,11 +47,13 @@
for Greenwich Mean Time). (Note that the sign of the timezone offset
is the opposite of the sign of the \code{time.timezone} variable for
the same timezone; the latter variable follows the \POSIX{} standard
-while this module follows \rfc{822}.)
+while this module follows \rfc{822}.) If the input string has no
+timezone, the last element of the tuple returned is \code{None}.
\end{funcdesc}
\begin{funcdesc}{mktime_tz}{tuple}
Turn a 10-tuple as returned by \code{parsedate_tz()} into a UTC timestamp.
+It the timezone item in the tuple is \code{None}, assume local time.
Minor deficiency: this first interprets the first 8 elements as a
local time and then compensates for the timezone difference;
this may yield a slight error around daylight savings time