LWG4124 Cannot format zoned_time with resolution coarser than seconds

Author: burblebee

source/time.tex

@@ -10994,6 +10994,9 @@
 
 \pnum
 \remarks
+If the \fmtgrammarterm{chrono-specs} is omitted,
+the result is equivalent to using \tcode{\%F \%T \%Z} as
+the \fmtgrammarterm{chrono-specs}.
 If \tcode{\%Z} is used,
 it is replaced with \tcode{*f.abbrev}
 if \tcode{f.abbrev} is not a null pointer value.
@@ -11012,7 +11015,7 @@
 \begin{codeblock}
 template<class Duration, class TimeZonePtr, class charT>
 struct formatter<chrono::zoned_time<Duration, TimeZonePtr>, charT>
-    : formatter<chrono::@\placeholder{local-time-format-t}@<Duration>, charT> {
+    : formatter<chrono::@\placeholder{local-time-format-t}@<common_type_t<Duration, seconds>>, charT> {
   template<class FormatContext>
     typename FormatContext::iterator
       format(const chrono::zoned_time<Duration, TimeZonePtr>& tp, FormatContext& ctx) const;
@@ -11032,7 +11035,7 @@
 Equivalent to:
 \begin{codeblock}
 sys_info info = tp.get_info();
-return formatter<chrono::@\placeholder{local-time-format-t}@<Duration>, charT>::
+return formatter<chrono::@\placeholder{local-time-format-t}@<common_type_t<Duration, seconds>>, charT>::
          format({tp.get_local_time(), &info.abbrev, &info.offset}, ctx);
 \end{codeblock}
 \end{itemdescr}