SF bug 671779: Error in tzinfo.dst() docs
tzinfo dst() should return timedelta(0) if DST is not effect, not 0.
diff --git a/Doc/lib/libdatetime.tex b/Doc/lib/libdatetime.tex
index 2421fa7..84869b0 100644
--- a/Doc/lib/libdatetime.tex
+++ b/Doc/lib/libdatetime.tex
@@ -1055,8 +1055,8 @@
\begin{methoddesc}{dst}{self, dt}
Return the daylight saving time (DST) adjustment, in minutes east of
- UTC, or \code{None} if DST information isn't known. Return \code{0} if
- DST is not in effect.
+ UTC, or \code{None} if DST information isn't known. Return
+ \code{timedelta(0)} if DST is not in effect.
If DST is in effect, return the offset as a
\class{timedelta} object (see \method{utcoffset()} for details).
Note that DST offset, if applicable, has