astimezone(): document that None is an OK argument.
diff --git a/Doc/lib/libdatetime.tex b/Doc/lib/libdatetime.tex
index 32c0f93..1a2e2d6 100644
--- a/Doc/lib/libdatetime.tex
+++ b/Doc/lib/libdatetime.tex
@@ -603,8 +603,8 @@
- astimezone(tz)
Return a \class{datetimetz} with the same date and time fields, and
- with \member{tzinfo} member \var{tz}. \var{tz} must be an instance
- of a \class{tzinfo} subclass.
+ with \member{tzinfo} member \var{tz}. \var{tz} must be \code{None},
+ or an instance of a \class{tzinfo} subclass.
- timetuple()
Return a 9-element tuple of the form returned by
@@ -1096,8 +1096,9 @@
- astimezone(tz)
Return a \class{datetimetz} with new tzinfo member \var{tz}. \var{tz}
- must be an instance of a \class{tzinfo} subclass. If self is naive, or
- if \code(tz.utcoffset(self)} returns \code{None},
+ must be \code{None}, or an instance of a \class{tzinfo} subclass. If
+ \var{tz} is \code{None}, self is naive, or
+ \code(tz.utcoffset(self)} returns \code{None},
\code{self.astimezone(tz)} is equivalent to
\code{self.replace(tzinfo=tz)}: a new timezone object is attached
without any conversion of date or time fields. If self is aware and