On Thu, Dec 16, 2021 at 03:46:47PM +0100, Jakub Jelinek via Gcc-patches wrote:
> glibc strptime passes around some state, what fields in struct tm have been
> set and what needs to be finalized through possibly recursive calls, and
> at the end performs various finalizations, like applying %p so that it
> works for both %I %p and %p %I orders, or applying century so that both
> %C %y and %y %C works, or computation of missing fields from others
> (e.g. from %Y and %j one can compute tm_mon, tm_mday and tm_wday,
> from %Y %U %w, %Y %W %w, %Y %U %a, or %Y %W %w one can compute
> tm_mon, tm_mday, tm_yday or e.g. from %Y %m %d one can compute tm_wday
> and tm_yday.
...

Here is an updated patch with _M_ prefixes on members instead of __
and no uglification of parameters and automatic vars in *.cc.  No changes
otherwise, bootstrapped/regtested on x86_64-linux and i686-linux
successfully.

2021-12-17  Jakub Jelinek  <ja...@redhat.com>

        PR libstdc++/77760
        * include/bits/locale_facets_nonio.h (__time_get_state): New struct.
        (time_get::_M_extract_via_format): Declare new method with
        __time_get_state& as an extra argument.
        * include/bits/locale_facets_nonio.tcc (_M_extract_via_format): Add
        __state argument, set various fields in it while parsing.  Handle %j,
        %U, %w and %W, fix up handling of %y, %Y and %C, don't adjust tm_hour
        for %p immediately.  Add a wrapper around the method without the
        __state argument for backwards compatibility.
        (_M_extract_num): Remove all __len == 4 special cases.
        (time_get::do_get_time, time_get::do_get_date, time_get::do_get): Zero
        initialize __state, pass it to _M_extract_via_format and finalize it
        at the end.
        (do_get_year): For 1-2 digit parsed years, map 0-68 to 2000-2068,
        69-99 to 1969-1999.  For 3-4 digit parsed years use that as year.
        (get): If do_get isn't overloaded from the locale_facets_nonio.tcc
        version, don't call do_get but call _M_extract_via_format instead to
        pass around state.
        * config/abi/pre/gnu.ver (GLIBCXX_3.4.30): Export _M_extract_via_format
        with extra __time_get_state and __time_get_state::_M_finalize_state.
        * src/c++98/locale_facets.cc (is_leap, day_of_the_week,
        day_of_the_year): New functions in anon namespace.
        (mon_yday): New var in anon namespace.
        (__time_get_state::_M_finalize_state): Define.
        * testsuite/22_locale/time_get/get/char/4.cc: New test.
        * testsuite/22_locale/time_get/get/wchar_t/4.cc: New test.
        * testsuite/22_locale/time_get/get_year/char/1.cc (test01): Parse 197
        as year 197AD instead of error.
        * testsuite/22_locale/time_get/get_year/char/5.cc (test01): Parse 1 as
        year 2001 instead of error.
        * testsuite/22_locale/time_get/get_year/char/6.cc: New test.
        * testsuite/22_locale/time_get/get_year/wchar_t/1.cc (test01): Parse
        197 as year 197AD instead of error.
        * testsuite/22_locale/time_get/get_year/wchar_t/5.cc (test01): Parse
        1 as year 2001 instead of error.
        * testsuite/22_locale/time_get/get_year/wchar_t/6.cc: New test.

--- libstdc++-v3/include/bits/locale_facets_nonio.h.jj  2021-12-10 
22:17:54.541591942 +0100
+++ libstdc++-v3/include/bits/locale_facets_nonio.h     2021-12-17 
00:21:33.125297992 +0100
@@ -355,6 +355,30 @@ namespace std _GLIBCXX_VISIBILITY(defaul
 {
 _GLIBCXX_BEGIN_NAMESPACE_VERSION
 
+  struct __time_get_state
+  {
+    // Finalize state.
+    void
+    _M_finalize_state(tm* __tm);
+
+    unsigned int _M_have_I : 1;
+    unsigned int _M_have_wday : 1;
+    unsigned int _M_have_yday : 1;
+    unsigned int _M_have_mon : 1;
+    unsigned int _M_have_mday : 1;
+    unsigned int _M_have_uweek : 1;
+    unsigned int _M_have_wweek : 1;
+    unsigned int _M_have_century : 1;
+    unsigned int _M_is_pm : 1;
+    unsigned int _M_want_century : 1;
+    unsigned int _M_want_xday : 1;
+    unsigned int _M_pad1 : 5;
+    unsigned int _M_week_no : 6;
+    unsigned int _M_pad2 : 10;
+    int _M_century;
+    int _M_pad3;
+  };
+
 _GLIBCXX_BEGIN_NAMESPACE_CXX11
 
   /**
@@ -756,6 +780,14 @@ _GLIBCXX_BEGIN_NAMESPACE_CXX11
       _M_extract_via_format(iter_type __beg, iter_type __end, ios_base& __io,
                            ios_base::iostate& __err, tm* __tm,
                            const _CharT* __format) const;
+
+      // Extract on a component-by-component basis, via __format argument, with
+      // state.
+      iter_type
+      _M_extract_via_format(iter_type __beg, iter_type __end, ios_base& __io,
+                           ios_base::iostate& __err, tm* __tm,
+                           const _CharT* __format,
+                           __time_get_state &__state) const;
     };
 
   template<typename _CharT, typename _InIter>
--- libstdc++-v3/include/bits/locale_facets_nonio.tcc.jj        2021-12-14 
22:48:04.656769701 +0100
+++ libstdc++-v3/include/bits/locale_facets_nonio.tcc   2021-12-17 
00:22:05.258841761 +0100
@@ -691,7 +691,8 @@ _GLIBCXX_END_NAMESPACE_LDBL_OR_CXX11
     time_get<_CharT, _InIter>::
     _M_extract_via_format(iter_type __beg, iter_type __end, ios_base& __io,
                          ios_base::iostate& __err, tm* __tm,
-                         const _CharT* __format) const
+                         const _CharT* __format,
+                         __time_get_state &__state) const
     {
       const locale& __loc = __io._M_getloc();
       const __timepunct<_CharT>& __tp = use_facet<__timepunct<_CharT> >(__loc);
@@ -722,7 +723,10 @@ _GLIBCXX_END_NAMESPACE_LDBL_OR_CXX11
                  __beg = _M_extract_name(__beg, __end, __mem, __days,
                                          14, __io, __tmperr);
                  if (!__tmperr)
-                   __tm->tm_wday = __mem % 7;
+                   {
+                     __tm->tm_wday = __mem % 7;
+                     __state._M_have_wday = 1;
+                   }
                  break;
                case 'h':
                case 'b':
@@ -734,14 +738,31 @@ _GLIBCXX_END_NAMESPACE_LDBL_OR_CXX11
                  __beg = _M_extract_name(__beg, __end, __mem,
                                          __months, 24, __io, __tmperr);
                  if (!__tmperr)
-                   __tm->tm_mon = __mem % 12;
+                   {
+                     __tm->tm_mon = __mem % 12;
+                     __state._M_have_mon = 1;
+                     __state._M_want_xday = 1;
+                   }
                  break;
                case 'c':
                  // Default time and date representation.
                  const char_type*  __dt[2];
                  __tp._M_date_time_formats(__dt);
                  __beg = _M_extract_via_format(__beg, __end, __io, __tmperr, 
-                                               __tm, __dt[0]);
+                                               __tm, __dt[0], __state);
+                 if (!__tmperr)
+                   __state._M_want_xday = 1;
+                 break;
+               case 'C':
+                 // Century.
+                 __beg = _M_extract_num(__beg, __end, __mem, 0, 99, 2,
+                                        __io, __tmperr);
+                 if (!__tmperr)
+                   {
+                     __state._M_century = __mem;
+                     __state._M_have_century = 1;
+                     __state._M_want_xday = 1;
+                   }
                  break;
                case 'd':
                case 'e':
@@ -751,35 +772,60 @@ _GLIBCXX_END_NAMESPACE_LDBL_OR_CXX11
                  __beg = _M_extract_num(__beg, __end, __mem, 1, 31, 2,
                                         __io, __tmperr);
                  if (!__tmperr)
-                   __tm->tm_mday = __mem;
+                   {
+                     __tm->tm_mday = __mem;
+                     __state._M_have_mday = 1;
+                     __state._M_want_xday = 1;
+                   }
                  break;
                case 'D':
                  // Equivalent to %m/%d/%y.[tm_mon, tm_mday, tm_year]
                  __cs = "%m/%d/%y";
                  __ctype.widen(__cs, __cs + 9, __wcs);
                  __beg = _M_extract_via_format(__beg, __end, __io, __tmperr, 
-                                               __tm, __wcs);
+                                               __tm, __wcs, __state);
+                 if (!__tmperr)
+                   __state._M_want_xday = 1;
                  break;
                case 'H':
                  // Hour [00, 23]. [tm_hour]
                  __beg = _M_extract_num(__beg, __end, __mem, 0, 23, 2,
                                         __io, __tmperr);
                  if (!__tmperr)
-                   __tm->tm_hour = __mem;
+                   {
+                     __tm->tm_hour = __mem;
+                     __state._M_have_I = 0;
+                   }
                  break;
                case 'I':
                  // Hour [01, 12]. [tm_hour]
                  __beg = _M_extract_num(__beg, __end, __mem, 1, 12, 2,
                                         __io, __tmperr);
                  if (!__tmperr)
-                   __tm->tm_hour = __mem % 12;
+                   {
+                     __tm->tm_hour = __mem % 12;
+                     __state._M_have_I = 1;
+                   }
+                 break;
+               case 'j':
+                 // Day number of year.
+                 __beg = _M_extract_num(__beg, __end, __mem, 1, 366, 3,
+                                        __io, __tmperr);
+                 if (!__tmperr)
+                   {
+                     __tm->tm_yday = __mem - 1;
+                     __state._M_have_yday = 1;
+                   }
                  break;
                case 'm':
                  // Month [01, 12]. [tm_mon]
                  __beg = _M_extract_num(__beg, __end, __mem, 1, 12, 2, 
                                         __io, __tmperr);
                  if (!__tmperr)
-                   __tm->tm_mon = __mem - 1;
+                   {
+                     __tm->tm_mon = __mem - 1;
+                     __state._M_have_mon = 1;
+                   }
                  break;
                case 'M':
                  // Minute [00, 59]. [tm_min]
@@ -802,23 +848,22 @@ _GLIBCXX_END_NAMESPACE_LDBL_OR_CXX11
                    break;
                  __beg = _M_extract_name(__beg, __end, __mem, __ampm,
                                          2, __io, __tmperr);
-                 // FIXME: This only works if %I comes before %p.
                  if (!__tmperr && __mem)
-                   __tm->tm_hour += 12;
+                   __state._M_is_pm = 1;
                  break;
                case 'r':
                  // Locale's 12-hour clock time format (in C %I:%M:%S %p).
                  const char_type*  __ampm_format;
                  __tp._M_am_pm_format(&__ampm_format);
                  __beg = _M_extract_via_format(__beg, __end, __io, __tmperr,
-                                               __tm, __ampm_format);
+                                               __tm, __ampm_format, __state);
                  break;
                case 'R':
                  // Equivalent to (%H:%M).
                  __cs = "%H:%M";
                  __ctype.widen(__cs, __cs + 6, __wcs);
                  __beg = _M_extract_via_format(__beg, __end, __io, __tmperr, 
-                                               __tm, __wcs);
+                                               __tm, __wcs, __state);
                  break;
                case 'S':
                  // Seconds. [tm_sec]
@@ -830,41 +875,105 @@ _GLIBCXX_END_NAMESPACE_LDBL_OR_CXX11
 #endif
                                         __io, __tmperr);
                  if (!__tmperr)
-                 __tm->tm_sec = __mem;
+                   __tm->tm_sec = __mem;
                  break;
                case 'T':
                  // Equivalent to (%H:%M:%S).
                  __cs = "%H:%M:%S";
                  __ctype.widen(__cs, __cs + 9, __wcs);
                  __beg = _M_extract_via_format(__beg, __end, __io, __tmperr, 
-                                               __tm, __wcs);
+                                               __tm, __wcs, __state);
+                 break;
+               case 'U':
+                 // Week number of the year (Sunday as first day of week).
+                 __beg = _M_extract_num(__beg, __end, __mem, 0, 53, 2,
+                                        __io, __tmperr);
+                 if (!__tmperr)
+                   {
+                     __state._M_week_no = __mem;
+                     __state._M_have_uweek = 1;
+                   }
+                 break;
+               case 'w':
+                 // Weekday [tm_wday]
+                 __beg = _M_extract_num(__beg, __end, __mem, 0, 6, 1,
+                                        __io, __tmperr);
+                 if (!__tmperr)
+                   {
+                     __tm->tm_wday = __mem;
+                     __state._M_have_wday = 1;
+                   }
+                 break;
+               case 'W':
+                 // Week number of the year (Monday as first day of week).
+                 __beg = _M_extract_num(__beg, __end, __mem, 0, 53, 2,
+                                        __io, __tmperr);
+                 if (!__tmperr)
+                   {
+                     __state._M_week_no = __mem;
+                     __state._M_have_wweek = 1;
+                   }
                  break;
                case 'x':
                  // Locale's date.
                  const char_type*  __dates[2];
                  __tp._M_date_formats(__dates);
                  __beg = _M_extract_via_format(__beg, __end, __io, __tmperr, 
-                                               __tm, __dates[0]);
+                                               __tm, __dates[0], __state);
                  break;
                case 'X':
                  // Locale's time.
                  const char_type*  __times[2];
                  __tp._M_time_formats(__times);
                  __beg = _M_extract_via_format(__beg, __end, __io, __tmperr, 
-                                               __tm, __times[0]);
+                                               __tm, __times[0], __state);
                  break;
                case 'y':
-               case 'C': // C99
-                 // Two digit year.
+                 // The last 2 digits of year.
+                 __beg = _M_extract_num(__beg, __end, __mem, 0, 99, 2,
+                                        __io, __tmperr);
+                 if (!__tmperr)
+                   {
+                     __state._M_want_century = 1;
+                     __state._M_want_xday = 1;
+                     // As an extension, if the 2 digits are followed by
+                     // 1-2 further digits, treat it like %Y.
+                     __c = 0;
+                     if (__beg != __end)
+                       __c = __ctype.narrow(*__beg, '*');
+                     if (__c >= '0' && __c <= '9')
+                       {
+                         ++__beg;
+                         __mem = __mem * 10 + (__c - '0');
+                         if (__beg != __end)
+                           {
+                             __c = __ctype.narrow(*__beg, '*');
+                             if (__c >= '0' && __c <= '9')
+                               {
+                                 ++__beg;
+                                 __mem = __mem * 10 + (__c - '0');
+                               }
+                           }
+                         __mem -= 1900;
+                         __state._M_want_century = 0;
+                       }
+                     // Otherwise, as per POSIX 2008, 00-68 is 2000-2068,
+                     // while 69-99 is 1969-1999.
+                     else if (__mem < 69)
+                       __mem += 100;
+                     __tm->tm_year = __mem;
+                   }
+                 break;
                case 'Y':
-                 // Year [1900).
-                 // NB: We parse either two digits, implicitly years since
-                 // 1900, or 4 digits, full year.  In both cases we can 
-                 // reconstruct [tm_year].  See also libstdc++/26701.
+                 // Year.
                  __beg = _M_extract_num(__beg, __end, __mem, 0, 9999, 4,
                                         __io, __tmperr);
                  if (!__tmperr)
-                   __tm->tm_year = __mem < 0 ? __mem + 100 : __mem - 1900;
+                   {
+                     __tm->tm_year = __mem - 1900;
+                     __state._M_want_century = 0;
+                     __state._M_want_xday = 1;
+                   }
                  break;
                case 'Z':
                  // Timezone info.
@@ -928,6 +1037,18 @@ _GLIBCXX_END_NAMESPACE_LDBL_OR_CXX11
   template<typename _CharT, typename _InIter>
     _InIter
     time_get<_CharT, _InIter>::
+    _M_extract_via_format(iter_type __beg, iter_type __end, ios_base& __io,
+                         ios_base::iostate& __err, tm* __tm,
+                         const _CharT* __format) const
+    {
+      __time_get_state __state = __time_get_state();
+      return _M_extract_via_format(__beg, __end, __io, __err, __tm,
+                                  __format, __state);
+    }
+
+  template<typename _CharT, typename _InIter>
+    _InIter
+    time_get<_CharT, _InIter>::
     _M_extract_num(iter_type __beg, iter_type __end, int& __member,
                   int __min, int __max, size_t __len,
                   ios_base& __io, ios_base::iostate& __err) const
@@ -949,13 +1070,7 @@ _GLIBCXX_END_NAMESPACE_LDBL_OR_CXX11
          else
            break;
        }
-      // Special encoding for do_get_year, 'y', and 'Y' above.
-      if (__len == 4 && __i == 2)
-       __member = __value - 100;
-      else if (__len == 4 && __i == 4)
-       __member = __value;
-      else if (__len == 2 && __i && __i <= 2
-              && __value >= __min && __value <= __max)
+      if (__i && __value >= __min && __value <= __max)
        __member = __value;
       else
        __err |= ios_base::failbit;
@@ -1212,8 +1327,10 @@ _GLIBCXX_END_NAMESPACE_LDBL_OR_CXX11
       const __timepunct<_CharT>& __tp = use_facet<__timepunct<_CharT> >(__loc);
       const char_type*  __times[2];
       __tp._M_time_formats(__times);
+      __time_get_state __state = __time_get_state();
       __beg = _M_extract_via_format(__beg, __end, __io, __err, 
-                                   __tm, __times[0]);
+                                   __tm, __times[0], __state);
+      __state._M_finalize_state(__tm);
       if (__beg == __end)
        __err |= ios_base::eofbit;
       return __beg;
@@ -1229,8 +1346,10 @@ _GLIBCXX_END_NAMESPACE_LDBL_OR_CXX11
       const __timepunct<_CharT>& __tp = use_facet<__timepunct<_CharT> >(__loc);
       const char_type*  __dates[2];
       __tp._M_date_formats(__dates);
+      __time_get_state __state = __time_get_state();
       __beg = _M_extract_via_format(__beg, __end, __io, __err, 
-                                   __tm, __dates[0]);
+                                   __tm, __dates[0], __state);
+      __state._M_finalize_state(__tm);
       if (__beg == __end)
        __err |= ios_base::eofbit;
       return __beg;
@@ -1296,11 +1415,38 @@ _GLIBCXX_END_NAMESPACE_LDBL_OR_CXX11
     {
       int __tmpyear;
       ios_base::iostate __tmperr = ios_base::goodbit;
+      const locale& __loc = __io._M_getloc();
+      const ctype<_CharT>& __ctype = use_facet<ctype<_CharT> >(__loc);
 
-      __beg = _M_extract_num(__beg, __end, __tmpyear, 0, 9999, 4,
+      __beg = _M_extract_num(__beg, __end, __tmpyear, 0, 99, 2,
                             __io, __tmperr);
       if (!__tmperr)
-       __tm->tm_year = __tmpyear < 0 ? __tmpyear + 100 : __tmpyear - 1900;
+       {
+         char __c = 0;
+         if (__beg != __end)
+           __c = __ctype.narrow(*__beg, '*');
+         // For 1-2 digit year, assume 69-99 is 1969-1999, 0-68 is 2000-2068.
+         // For 3-4 digit year, use it as year.
+         // __tm->tm_year needs year - 1900 though.
+         if (__c >= '0' && __c <= '9')
+           {
+             ++__beg;
+             __tmpyear = __tmpyear * 10 + (__c - '0');
+             if (__beg != __end)
+               {
+                 __c = __ctype.narrow(*__beg, '*');
+                 if (__c >= '0' && __c <= '9')
+                   {
+                     ++__beg;
+                     __tmpyear = __tmpyear * 10 + (__c - '0');
+                   }
+               }
+             __tmpyear -= 1900;
+           }
+         else if (__tmpyear < 69)
+           __tmpyear += 100;
+         __tm->tm_year = __tmpyear;
+       }
       else
        __err |= ios_base::failbit;
 
@@ -1321,6 +1467,21 @@ _GLIBCXX_END_NAMESPACE_LDBL_OR_CXX11
       const locale& __loc = __io._M_getloc();
       ctype<_CharT> const& __ctype = use_facet<ctype<_CharT> >(__loc);
       __err = ios_base::goodbit;
+      bool __use_state = false;
+#if __GNUC__ >= 5
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wpmf-conversions"
+      // Nasty hack.  The C++ standard mandates that get invokes the do_get
+      // virtual method, but unfortunately at least without an ABI change
+      // for the facets we can't keep state across the different do_get
+      // calls.  So e.g. if __fmt is "%p %I:%M:%S", we can't handle it
+      // properly, because we first handle the %p am/pm specifier and only
+      // later the 12-hour format specifier.
+      if ((void*)(this->*(&time_get::do_get)) == (void*)(&time_get::do_get))
+       __use_state = true;
+#pragma GCC diagnostic pop
+#endif
+      __time_get_state __state = __time_get_state();
       while (__fmt != __fmtend &&
              __err == ios_base::goodbit)
         {
@@ -1331,6 +1492,7 @@ _GLIBCXX_END_NAMESPACE_LDBL_OR_CXX11
             }
           else if (__ctype.narrow(*__fmt, 0) == '%')
             {
+             const char_type* __fmt_start = __fmt;
               char __format;
               char __mod = 0;
               if (++__fmt == __fmtend)
@@ -1351,8 +1513,26 @@ _GLIBCXX_END_NAMESPACE_LDBL_OR_CXX11
                   __err = ios_base::failbit;
                   break;
                 }
-              __s = this->do_get(__s, __end, __io, __err, __tm, __format,
-                                __mod);
+             if (__use_state)
+               {
+                 char_type __new_fmt[4];
+                 __new_fmt[0] = __fmt_start[0];
+                 __new_fmt[1] = __fmt_start[1];
+                 if (__mod)
+                   {
+                     __new_fmt[2] = __fmt_start[2];
+                     __new_fmt[3] = char_type();
+                   }
+                 else
+                   __new_fmt[2] = char_type();
+                 __s = _M_extract_via_format(__s, __end, __io, __err, __tm,
+                                             __new_fmt, __state);
+                 if (__s == __end)
+                   __err |= ios_base::eofbit;
+               }
+             else
+               __s = this->do_get(__s, __end, __io, __err, __tm, __format,
+                                  __mod);
               ++__fmt;
             }
           else if (__ctype.is(ctype_base::space, *__fmt))
@@ -1379,6 +1559,8 @@ _GLIBCXX_END_NAMESPACE_LDBL_OR_CXX11
               break;
             }
         }
+      if (__use_state)
+       __state._M_finalize_state(__tm);
       return __s;
     }
 
@@ -1408,7 +1590,10 @@ _GLIBCXX_END_NAMESPACE_LDBL_OR_CXX11
           __fmt[3] = char_type();
         }
 
-      __beg = _M_extract_via_format(__beg, __end, __io, __err, __tm, __fmt);
+      __time_get_state __state = __time_get_state();
+      __beg = _M_extract_via_format(__beg, __end, __io, __err, __tm, __fmt,
+                                   __state);
+      __state._M_finalize_state(__tm);
       if (__beg == __end)
        __err |= ios_base::eofbit;
       return __beg;
--- libstdc++-v3/config/abi/pre/gnu.ver.jj      2021-12-10 22:17:54.532592071 
+0100
+++ libstdc++-v3/config/abi/pre/gnu.ver 2021-12-16 11:58:48.821827111 +0100
@@ -628,7 +628,7 @@ GLIBCXX_3.4 {
     _ZNSt8time_get*;
     _ZNKSt8time_getI[cw]St19istreambuf_iteratorI[cw]St11char_traitsI[cw]EEE1*;
     _ZNKSt8time_getI[cw]St19istreambuf_iteratorI[cw]St11char_traitsI[cw]EEE8*;
-    _ZNKSt8time_getI[cw]St19istreambuf_iteratorI[cw]St11char_traitsI[cw]EEE21*;
+    
_ZNKSt8time_getI[cw]St19istreambuf_iteratorI[cw]St11char_traitsI[cw]EEE21*PK[cw];
 
     # std::time_get_byname
     _ZNSt15time_get_bynameI[cw]*EEEC[12]EPKc[jmy];
@@ -1887,7 +1887,9 @@ GLIBCXX_3.4.21 {
     _ZNKSt7__cxx119money_putI*;
     _ZNKSt7__cxx1110moneypunctI*;
     _ZNKSt7__cxx118numpunctI*;
-    _ZNKSt7__cxx118time_getI*;
+    
_ZNKSt7__cxx118time_getI[cw]St19istreambuf_iteratorI[cw]St11char_traitsI[cw]EEE[13-9]*;
+    
_ZNKSt7__cxx118time_getI[cw]St19istreambuf_iteratorI[cw]St11char_traitsI[cw]EEE21*PK[cw];
+    
_ZNKSt7__cxx118time_getI[cw]St19istreambuf_iteratorI[cw]St11char_traitsI[cw]EEE24*;
 
     _ZSt9has_facetINSt7__cxx117collate*;
     _ZSt9has_facetINSt7__cxx118messages*;
@@ -2424,6 +2426,12 @@ GLIBCXX_3.4.30 {
     # std::__timepunct<char>::_M_am_pm_format(const char**)
     _ZNKSt11__timepunctI[cw]E15_M_am_pm_formatEPPK[cw];
 
+    # std::time_get
+    
_ZNKSt8time_getI[cw]St19istreambuf_iteratorI[cw]St11char_traitsI[cw]EEE21*__time_get_state;
+    
_ZNKSt7__cxx118time_getI[cw]St19istreambuf_iteratorI[cw]St11char_traitsI[cw]EEE21*__time_get_state;
+
+    _ZNSt16__time_get_state17_M_finalize_stateEP2tm;
+
 } GLIBCXX_3.4.29;
 
 # Symbols in the support library (libsupc++) have their own tag.
--- libstdc++-v3/src/c++98/locale_facets.cc.jj  2021-01-05 00:13:58.345296630 
+0100
+++ libstdc++-v3/src/c++98/locale_facets.cc     2021-12-17 00:25:04.942290607 
+0100
@@ -134,5 +134,115 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
                                   __grouping_tmp.size());
   }
 
+  namespace
+  {
+    bool
+    is_leap(int year)
+    {
+      return (year % 100 != 0 || year % 400 == 0) && year % 4 == 0;
+    }
+
+    const unsigned short int mon_yday[2][13] =
+    {
+      // Normal years.
+      { 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365 },
+      // Leap years.
+      { 0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335, 366 }
+    };
+
+    int
+    day_of_the_week (int year, int mon, int mday)
+    {
+      // We know that January 1st 1970 was a Thursday (= 4).  Compute the
+      // difference between this date and the one in arguments and so
+      // determine the weekday.
+      int corr_year = 1900 + year - (mon < 2);
+      int wday = (-473
+                 + (365 * (year - 70))
+                 + (corr_year / 4)
+                 - ((corr_year / 4) / 25) + ((corr_year / 4) % 25 < 0)
+                 + (((corr_year / 4) / 25) / 4)
+                 + mon_yday[0][mon]
+                 + mday - 1);
+      return ((wday % 7) + 7) % 7;
+    }
+
+    // Compute the day of the year.
+    int
+    day_of_the_year (tm *tm)
+    {
+      return (mon_yday[is_leap (1900 + tm->tm_year)][tm->tm_mon]
+             + (tm->tm_mday - 1));
+    }
+  }
+
+  // Finalize time_get state.
+  void
+  __time_get_state::
+  _M_finalize_state(tm* tm)
+  {
+    if (_M_have_I && _M_is_pm)
+      tm->tm_hour += 12;
+    if (_M_have_century)
+      {
+       if (_M_want_century)
+         tm->tm_year = tm->tm_year % 100;
+       else
+         tm->tm_year = 0;
+       tm->tm_year += (_M_century - 19) * 100;
+      }
+    if (_M_want_xday && !_M_have_wday)
+      {
+       if (!(_M_have_mon && _M_have_mday) && _M_have_yday)
+         {
+           // We don't have tm_mon and/or tm_mday, compute them.
+           int t_mon = 0;
+           while (mon_yday[is_leap(1900 + tm->tm_year)][t_mon]
+                  <= tm->tm_yday)
+             ++t_mon;
+           if (!_M_have_mon)
+             tm->tm_mon = t_mon - 1;
+           if (!_M_have_mday)
+             tm->tm_mday
+               = (tm->tm_yday
+                  - mon_yday[is_leap(1900 + tm->tm_year)][t_mon - 1] + 1);
+           _M_have_mon = 1;
+           _M_have_mday = 1;
+         }
+       // Don't crash in day_of_the_week if tm_mon is uninitialized.
+       if (_M_have_mon || (unsigned) tm->tm_mon <= 11)
+         tm->tm_wday
+           = day_of_the_week (tm->tm_year, tm->tm_mon, tm->tm_mday);
+      }
+    if (_M_want_xday
+       && !_M_have_yday
+       && (_M_have_mon || (unsigned) tm->tm_mon <= 11))
+      tm->tm_yday = day_of_the_year (tm);
+    if ((_M_have_uweek || _M_have_wweek) && _M_have_wday)
+      {
+       int w_offset = _M_have_uweek ? 0 : 1;
+       int wday = day_of_the_week (tm->tm_year, 0, 1);
+
+       if (!_M_have_yday)
+         tm->tm_yday = ((7 - (wday - w_offset)) % 7
+                        + (_M_week_no - 1) * 7
+                        + (tm->tm_wday - w_offset + 7) % 7);
+
+       if (!_M_have_mday || !_M_have_mon)
+         {
+           int t_mon = 0;
+           while (mon_yday[is_leap(1900 + tm->tm_year)][t_mon]
+                  <= tm->tm_yday)
+             ++t_mon;
+           if (!_M_have_mon)
+             tm->tm_mon = t_mon - 1;
+           if (!_M_have_mday)
+             tm->tm_mday
+               = (tm->tm_yday
+                  - mon_yday[is_leap(1900 + tm->tm_year)][t_mon - 1] + 1);
+         }
+      }
+  }
+
 _GLIBCXX_END_NAMESPACE_VERSION
 } // namespace
--- libstdc++-v3/testsuite/22_locale/time_get/get/char/4.cc.jj  2021-12-16 
13:31:29.000704911 +0100
+++ libstdc++-v3/testsuite/22_locale/time_get/get/char/4.cc     2021-12-16 
15:17:09.180601201 +0100
@@ -0,0 +1,243 @@
+// { dg-do run { target c++11 } }
+
+// Copyright (C) 2021 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3.  If not see
+// <http://www.gnu.org/licenses/>.
+
+#include <locale>
+#include <sstream>
+#include <iterator>
+#include <testsuite_hooks.h>
+
+void
+test01()
+{
+  using namespace std;
+
+  locale loc_c = locale::classic();
+
+  istringstream iss;
+  iss.imbue(loc_c);
+  const time_get<char>& tget = use_facet<time_get<char>>(iss.getloc());
+  typedef istreambuf_iterator<char> iter;
+  const iter end;
+
+  tm time;
+  ios_base::iostate err = ios_base::badbit;
+
+  iss.str("PM01:38:12");
+  string format = "%p%I:%M:%S";
+  time = tm();
+  auto ret = tget.get(iter(iss), end, iss, err, &time,
+                     format.data(), format.data()+format.size());
+  VERIFY( err == ios_base::eofbit );
+  VERIFY( ret == end );
+  VERIFY( time.tm_hour == 13 );
+  VERIFY( time.tm_min == 38 );
+  VERIFY( time.tm_sec == 12 );
+
+  iss.str("05 37");
+  format = "%C %y";
+  time = tm();
+  ret = tget.get(iter(iss), end, iss, err, &time,
+                format.data(), format.data()+format.size());
+  VERIFY( err == ios_base::eofbit );
+  VERIFY( ret == end );
+  VERIFY( time.tm_year == 537 - 1900 );
+
+  iss.str("68");
+  format = "%y";
+  time = tm();
+  ret = tget.get(iter(iss), end, iss, err, &time,
+                format.data(), format.data()+format.size());
+  VERIFY( err == ios_base::eofbit );
+  VERIFY( ret == end );
+  VERIFY( time.tm_year == 2068 - 1900 );
+
+  iss.str("69");
+  format = "%y";
+  time = tm();
+  ret = tget.get(iter(iss), end, iss, err, &time,
+                format.data(), format.data()+format.size());
+  VERIFY( err == ios_base::eofbit );
+  VERIFY( ret == end );
+  VERIFY( time.tm_year == 1969 - 1900 );
+
+  iss.str("03-Feb-2003");
+  format = "%d-%b-%Y";
+  time = tm();
+  ret = tget.get(iter(iss), end, iss, err, &time,
+                format.data(), format.data()+format.size());
+  VERIFY( err == ios_base::eofbit );
+  VERIFY( ret == end );
+  VERIFY( time.tm_year == 2003 - 1900 );
+  VERIFY( time.tm_mon == 1 );
+  VERIFY( time.tm_mday == 3 );
+  VERIFY( time.tm_wday == 1 );
+  VERIFY( time.tm_yday == 33 );
+
+  iss.str("16-Dec-2020");
+  format = "%d-%b-%Y";
+  time = tm();
+  ret = tget.get(iter(iss), end, iss, err, &time,
+                format.data(), format.data()+format.size());
+  VERIFY( err == ios_base::eofbit );
+  VERIFY( ret == end );
+  VERIFY( time.tm_year == 2020 - 1900 );
+  VERIFY( time.tm_mon == 11 );
+  VERIFY( time.tm_mday == 16 );
+  VERIFY( time.tm_wday == 3 );
+  VERIFY( time.tm_yday == 350 );
+
+  iss.str("16-Dec-2021");
+  format = "%d-%b-%Y";
+  time = tm();
+  ret = tget.get(iter(iss), end, iss, err, &time,
+                format.data(), format.data()+format.size());
+  VERIFY( err == ios_base::eofbit );
+  VERIFY( ret == end );
+  VERIFY( time.tm_year == 2021 - 1900 );
+  VERIFY( time.tm_mon == 11 );
+  VERIFY( time.tm_mday == 16 );
+  VERIFY( time.tm_wday == 4 );
+  VERIFY( time.tm_yday == 349 );
+
+  iss.str("253 2020");
+  format = "%j %Y";
+  time = tm();
+  ret = tget.get(iter(iss), end, iss, err, &time,
+                format.data(), format.data()+format.size());
+  VERIFY( err == ios_base::eofbit );
+  VERIFY( ret == end );
+  VERIFY( time.tm_year == 2020 - 1900 );
+  VERIFY( time.tm_mon == 8 );
+  VERIFY( time.tm_mday == 9 );
+  VERIFY( time.tm_wday == 3 );
+  VERIFY( time.tm_yday == 252 );
+
+  iss.str("233 2021");
+  format = "%j %Y";
+  time = tm();
+  ret = tget.get(iter(iss), end, iss, err, &time,
+                format.data(), format.data()+format.size());
+  VERIFY( err == ios_base::eofbit );
+  VERIFY( ret == end );
+  VERIFY( time.tm_year == 2021 - 1900 );
+  VERIFY( time.tm_mon == 7 );
+  VERIFY( time.tm_mday == 21 );
+  VERIFY( time.tm_wday == 6 );
+  VERIFY( time.tm_yday == 232 );
+
+  iss.str("2020 23 3");
+  format = "%Y %U %w";
+  time = tm();
+  ret = tget.get(iter(iss), end, iss, err, &time,
+                format.data(), format.data()+format.size());
+  VERIFY( err == ios_base::eofbit );
+  VERIFY( ret == end );
+  VERIFY( time.tm_year == 2020 - 1900 );
+  VERIFY( time.tm_mon == 5 );
+  VERIFY( time.tm_mday == 10 );
+  VERIFY( time.tm_wday == 3 );
+  VERIFY( time.tm_yday == 161 );
+
+  iss.str("2020 23 3");
+  format = "%Y %W %w";
+  time = tm();
+  ret = tget.get(iter(iss), end, iss, err, &time,
+                format.data(), format.data()+format.size());
+  VERIFY( err == ios_base::eofbit );
+  VERIFY( ret == end );
+  VERIFY( time.tm_year == 2020 - 1900 );
+  VERIFY( time.tm_mon == 5 );
+  VERIFY( time.tm_mday == 10 );
+  VERIFY( time.tm_wday == 3 );
+  VERIFY( time.tm_yday == 161 );
+
+  iss.str("2021 43 Fri");
+  format = "%Y %W %a";
+  time = tm();
+  ret = tget.get(iter(iss), end, iss, err, &time,
+                format.data(), format.data()+format.size());
+  VERIFY( err == ios_base::eofbit );
+  VERIFY( ret == end );
+  VERIFY( time.tm_year == 2021 - 1900 );
+  VERIFY( time.tm_mon == 9 );
+  VERIFY( time.tm_mday == 29 );
+  VERIFY( time.tm_wday == 5 );
+  VERIFY( time.tm_yday == 301 );
+
+  iss.str("2024 23 3");
+  format = "%Y %U %w";
+  time = tm();
+  ret = tget.get(iter(iss), end, iss, err, &time,
+                format.data(), format.data()+format.size());
+  VERIFY( err == ios_base::eofbit );
+  VERIFY( ret == end );
+  VERIFY( time.tm_year == 2024 - 1900 );
+  VERIFY( time.tm_mon == 5 );
+  VERIFY( time.tm_mday == 12 );
+  VERIFY( time.tm_wday == 3 );
+  VERIFY( time.tm_yday == 163 );
+
+  iss.str("2024 23 3");
+  format = "%Y %W %w";
+  time = tm();
+  ret = tget.get(iter(iss), end, iss, err, &time,
+                format.data(), format.data()+format.size());
+  VERIFY( err == ios_base::eofbit );
+  VERIFY( ret == end );
+  VERIFY( time.tm_year == 2024 - 1900 );
+  VERIFY( time.tm_mon == 5 );
+  VERIFY( time.tm_mday == 5 );
+  VERIFY( time.tm_wday == 3 );
+  VERIFY( time.tm_yday == 156 );
+
+  // As an extension, parse also 4 digit years.
+  iss.str("0068");
+  format = "%y";
+  time = tm();
+  ret = tget.get(iter(iss), end, iss, err, &time,
+                format.data(), format.data()+format.size());
+  VERIFY( err == ios_base::eofbit );
+  VERIFY( ret == end );
+  VERIFY( time.tm_year == 68 - 1900 );
+
+  iss.str("0069");
+  format = "%y";
+  time = tm();
+  ret = tget.get(iter(iss), end, iss, err, &time,
+                format.data(), format.data()+format.size());
+  VERIFY( err == ios_base::eofbit );
+  VERIFY( ret == end );
+  VERIFY( time.tm_year == 69 - 1900 );
+
+  iss.str("1492");
+  format = "%y";
+  time = tm();
+  ret = tget.get(iter(iss), end, iss, err, &time,
+                format.data(), format.data()+format.size());
+  VERIFY( err == ios_base::eofbit );
+  VERIFY( ret == end );
+  VERIFY( time.tm_year == 1492 - 1900 );
+}
+
+int
+main()
+{
+  test01();
+  return 0;
+}
--- libstdc++-v3/testsuite/22_locale/time_get/get/wchar_t/4.cc.jj       
2021-12-16 13:43:01.435849616 +0100
+++ libstdc++-v3/testsuite/22_locale/time_get/get/wchar_t/4.cc  2021-12-16 
15:18:06.672780110 +0100
@@ -0,0 +1,243 @@
+// { dg-do run { target c++11 } }
+
+// Copyright (C) 2021 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3.  If not see
+// <http://www.gnu.org/licenses/>.
+
+#include <locale>
+#include <sstream>
+#include <iterator>
+#include <testsuite_hooks.h>
+
+void
+test01()
+{
+  using namespace std;
+
+  locale loc_c = locale::classic();
+
+  wistringstream iss;
+  iss.imbue(loc_c);
+  const time_get<wchar_t>& tget = use_facet<time_get<wchar_t>>(iss.getloc());
+  typedef istreambuf_iterator<wchar_t> iter;
+  const iter end;
+
+  tm time;
+  ios_base::iostate err = ios_base::badbit;
+
+  iss.str(L"PM01:38:12");
+  wstring format = L"%p%I:%M:%S";
+  time = tm();
+  auto ret = tget.get(iter(iss), end, iss, err, &time,
+                     format.data(), format.data()+format.size());
+  VERIFY( err == ios_base::eofbit );
+  VERIFY( ret == end );
+  VERIFY( time.tm_hour == 13 );
+  VERIFY( time.tm_min == 38 );
+  VERIFY( time.tm_sec == 12 );
+
+  iss.str(L"05 37");
+  format = L"%C %y";
+  time = tm();
+  ret = tget.get(iter(iss), end, iss, err, &time,
+                format.data(), format.data()+format.size());
+  VERIFY( err == ios_base::eofbit );
+  VERIFY( ret == end );
+  VERIFY( time.tm_year == 537 - 1900 );
+
+  iss.str(L"68");
+  format = L"%y";
+  time = tm();
+  ret = tget.get(iter(iss), end, iss, err, &time,
+                format.data(), format.data()+format.size());
+  VERIFY( err == ios_base::eofbit );
+  VERIFY( ret == end );
+  VERIFY( time.tm_year == 2068 - 1900 );
+
+  iss.str(L"69");
+  format = L"%y";
+  time = tm();
+  ret = tget.get(iter(iss), end, iss, err, &time,
+                format.data(), format.data()+format.size());
+  VERIFY( err == ios_base::eofbit );
+  VERIFY( ret == end );
+  VERIFY( time.tm_year == 1969 - 1900 );
+
+  iss.str(L"03-Feb-2003");
+  format = L"%d-%b-%Y";
+  time = tm();
+  ret = tget.get(iter(iss), end, iss, err, &time,
+                format.data(), format.data()+format.size());
+  VERIFY( err == ios_base::eofbit );
+  VERIFY( ret == end );
+  VERIFY( time.tm_year == 2003 - 1900 );
+  VERIFY( time.tm_mon == 1 );
+  VERIFY( time.tm_mday == 3 );
+  VERIFY( time.tm_wday == 1 );
+  VERIFY( time.tm_yday == 33 );
+
+  iss.str(L"16-Dec-2020");
+  format = L"%d-%b-%Y";
+  time = tm();
+  ret = tget.get(iter(iss), end, iss, err, &time,
+                format.data(), format.data()+format.size());
+  VERIFY( err == ios_base::eofbit );
+  VERIFY( ret == end );
+  VERIFY( time.tm_year == 2020 - 1900 );
+  VERIFY( time.tm_mon == 11 );
+  VERIFY( time.tm_mday == 16 );
+  VERIFY( time.tm_wday == 3 );
+  VERIFY( time.tm_yday == 350 );
+
+  iss.str(L"16-Dec-2021");
+  format = L"%d-%b-%Y";
+  time = tm();
+  ret = tget.get(iter(iss), end, iss, err, &time,
+                format.data(), format.data()+format.size());
+  VERIFY( err == ios_base::eofbit );
+  VERIFY( ret == end );
+  VERIFY( time.tm_year == 2021 - 1900 );
+  VERIFY( time.tm_mon == 11 );
+  VERIFY( time.tm_mday == 16 );
+  VERIFY( time.tm_wday == 4 );
+  VERIFY( time.tm_yday == 349 );
+
+  iss.str(L"253 2020");
+  format = L"%j %Y";
+  time = tm();
+  ret = tget.get(iter(iss), end, iss, err, &time,
+                format.data(), format.data()+format.size());
+  VERIFY( err == ios_base::eofbit );
+  VERIFY( ret == end );
+  VERIFY( time.tm_year == 2020 - 1900 );
+  VERIFY( time.tm_mon == 8 );
+  VERIFY( time.tm_mday == 9 );
+  VERIFY( time.tm_wday == 3 );
+  VERIFY( time.tm_yday == 252 );
+
+  iss.str(L"233 2021");
+  format = L"%j %Y";
+  time = tm();
+  ret = tget.get(iter(iss), end, iss, err, &time,
+                format.data(), format.data()+format.size());
+  VERIFY( err == ios_base::eofbit );
+  VERIFY( ret == end );
+  VERIFY( time.tm_year == 2021 - 1900 );
+  VERIFY( time.tm_mon == 7 );
+  VERIFY( time.tm_mday == 21 );
+  VERIFY( time.tm_wday == 6 );
+  VERIFY( time.tm_yday == 232 );
+
+  iss.str(L"2020 23 3");
+  format = L"%Y %U %w";
+  time = tm();
+  ret = tget.get(iter(iss), end, iss, err, &time,
+                format.data(), format.data()+format.size());
+  VERIFY( err == ios_base::eofbit );
+  VERIFY( ret == end );
+  VERIFY( time.tm_year == 2020 - 1900 );
+  VERIFY( time.tm_mon == 5 );
+  VERIFY( time.tm_mday == 10 );
+  VERIFY( time.tm_wday == 3 );
+  VERIFY( time.tm_yday == 161 );
+
+  iss.str(L"2020 23 3");
+  format = L"%Y %W %w";
+  time = tm();
+  ret = tget.get(iter(iss), end, iss, err, &time,
+                format.data(), format.data()+format.size());
+  VERIFY( err == ios_base::eofbit );
+  VERIFY( ret == end );
+  VERIFY( time.tm_year == 2020 - 1900 );
+  VERIFY( time.tm_mon == 5 );
+  VERIFY( time.tm_mday == 10 );
+  VERIFY( time.tm_wday == 3 );
+  VERIFY( time.tm_yday == 161 );
+
+  iss.str(L"2021 43 Fri");
+  format = L"%Y %W %a";
+  time = tm();
+  ret = tget.get(iter(iss), end, iss, err, &time,
+                format.data(), format.data()+format.size());
+  VERIFY( err == ios_base::eofbit );
+  VERIFY( ret == end );
+  VERIFY( time.tm_year == 2021 - 1900 );
+  VERIFY( time.tm_mon == 9 );
+  VERIFY( time.tm_mday == 29 );
+  VERIFY( time.tm_wday == 5 );
+  VERIFY( time.tm_yday == 301 );
+
+  iss.str(L"2024 23 3");
+  format = L"%Y %U %w";
+  time = tm();
+  ret = tget.get(iter(iss), end, iss, err, &time,
+                format.data(), format.data()+format.size());
+  VERIFY( err == ios_base::eofbit );
+  VERIFY( ret == end );
+  VERIFY( time.tm_year == 2024 - 1900 );
+  VERIFY( time.tm_mon == 5 );
+  VERIFY( time.tm_mday == 12 );
+  VERIFY( time.tm_wday == 3 );
+  VERIFY( time.tm_yday == 163 );
+
+  iss.str(L"2024 23 3");
+  format = L"%Y %W %w";
+  time = tm();
+  ret = tget.get(iter(iss), end, iss, err, &time,
+                format.data(), format.data()+format.size());
+  VERIFY( err == ios_base::eofbit );
+  VERIFY( ret == end );
+  VERIFY( time.tm_year == 2024 - 1900 );
+  VERIFY( time.tm_mon == 5 );
+  VERIFY( time.tm_mday == 5 );
+  VERIFY( time.tm_wday == 3 );
+  VERIFY( time.tm_yday == 156 );
+
+  // As an extension, parse also 4 digit years.
+  iss.str(L"0068");
+  format = L"%y";
+  time = tm();
+  ret = tget.get(iter(iss), end, iss, err, &time,
+                format.data(), format.data()+format.size());
+  VERIFY( err == ios_base::eofbit );
+  VERIFY( ret == end );
+  VERIFY( time.tm_year == 68 - 1900 );
+
+  iss.str(L"0069");
+  format = L"%y";
+  time = tm();
+  ret = tget.get(iter(iss), end, iss, err, &time,
+                format.data(), format.data()+format.size());
+  VERIFY( err == ios_base::eofbit );
+  VERIFY( ret == end );
+  VERIFY( time.tm_year == 69 - 1900 );
+
+  iss.str(L"1492");
+  format = L"%y";
+  time = tm();
+  ret = tget.get(iter(iss), end, iss, err, &time,
+                format.data(), format.data()+format.size());
+  VERIFY( err == ios_base::eofbit );
+  VERIFY( ret == end );
+  VERIFY( time.tm_year == 1492 - 1900 );
+}
+
+int
+main()
+{
+  test01();
+  return 0;
+}
--- libstdc++-v3/testsuite/22_locale/time_get/get_year/char/1.cc.jj     
2021-01-05 00:13:58.000000000 +0100
+++ libstdc++-v3/testsuite/22_locale/time_get/get_year/char/1.cc        
2021-12-16 12:17:55.828490362 +0100
@@ -76,8 +76,8 @@ void test01()
   errorstate = good;
   iterator_type ret03 = tim_get.get_year(is_it03, end, iss, errorstate,
                                         &time03);
-  VERIFY( time03.tm_year == 3 );
-  VERIFY( errorstate == ios_base::failbit );
+  VERIFY( time03.tm_year == 197 - 1900 );
+  VERIFY( errorstate == good );
   VERIFY( *ret03 == 'd' );
 
   iss.str("71d71");
--- libstdc++-v3/testsuite/22_locale/time_get/get_year/char/5.cc.jj     
2021-01-05 00:13:58.000000000 +0100
+++ libstdc++-v3/testsuite/22_locale/time_get/get_year/char/5.cc        
2021-12-16 13:50:47.481218269 +0100
@@ -49,12 +49,13 @@ void test01()
 
   const string str0 = "1";
   tg.get_year(str0.begin(), str0.end(), iss, err, &tm0);
-  VERIFY( err == (failbit | eofbit) );
-  VERIFY( tm0.tm_year == 0 );
+  VERIFY( err == eofbit );
+  VERIFY( tm0.tm_year == 2001 - 1900 );
 
   const string str1 = "1997 ";
+  err = goodbit;
   iter_type end1 = tg.get_year(str1.begin(), str1.end(), iss, err, &tm1);
-  VERIFY( err == (failbit | eofbit) );
+  VERIFY( err == goodbit );
   VERIFY( tm1.tm_year == time_sanity.tm_year );
   VERIFY( *end1 ==  ' ' );
 }
--- libstdc++-v3/testsuite/22_locale/time_get/get_year/char/6.cc.jj     
2021-12-16 13:23:34.596457450 +0100
+++ libstdc++-v3/testsuite/22_locale/time_get/get_year/char/6.cc        
2021-12-16 13:49:35.055248817 +0100
@@ -0,0 +1,79 @@
+// Copyright (C) 2001-2021 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3.  If not see
+// <http://www.gnu.org/licenses/>.
+
+// 22.2.5.1.1 time_get members
+
+#include <locale>
+#include <sstream>
+#include <testsuite_hooks.h>
+
+void test01()
+{
+  using namespace std;
+
+  typedef istreambuf_iterator<char> iterator_type;
+
+  locale loc_c = locale::classic();
+
+  iterator_type end;
+
+  istringstream iss;
+  iss.imbue(loc_c);
+  const time_get<char>& tim_get = use_facet<time_get<char> >(iss.getloc());
+  ios_base::iostate errorstate = ios_base::goodbit;
+
+  iss.str("69");
+  iterator_type is_it01(iss);
+  tm time01;
+  tim_get.get_year(is_it01, end, iss, errorstate, &time01);
+  VERIFY( time01.tm_year == 1969 - 1900 );
+  VERIFY( errorstate == ios_base::eofbit );
+
+  iss.str("68 ");
+  iterator_type is_it02(iss);
+  tm time02;
+  errorstate = ios_base::goodbit;
+  iterator_type ret02 = tim_get.get_year(is_it02, end, iss, errorstate,
+                                        &time02);
+  VERIFY( time02.tm_year == 2068 - 1900 );
+  VERIFY( errorstate == ios_base::goodbit );
+  VERIFY( *ret02 == ' ' );
+
+  iss.str("0069");
+  iterator_type is_it03(iss);
+  tm time03;
+  errorstate = ios_base::goodbit;
+  iterator_type ret03 = tim_get.get_year(is_it03, end, iss, errorstate,
+                                        &time03);
+  VERIFY( time03.tm_year == 69 - 1900 );
+  VERIFY( errorstate == ios_base::eofbit );
+
+  iss.str("0068");
+  iterator_type is_it04(iss);
+  tm time04;
+  errorstate = ios_base::goodbit;
+  iterator_type ret04 = tim_get.get_year(is_it04, end, iss, errorstate,
+                                        &time04);
+  VERIFY( time04.tm_year == 68 - 1900 );
+  VERIFY( errorstate == ios_base::eofbit );
+}
+
+int main()
+{
+  test01();
+  return 0;
+}
--- libstdc++-v3/testsuite/22_locale/time_get/get_year/wchar_t/1.cc.jj  
2021-01-05 00:13:58.000000000 +0100
+++ libstdc++-v3/testsuite/22_locale/time_get/get_year/wchar_t/1.cc     
2021-12-16 12:19:44.565943238 +0100
@@ -76,8 +76,8 @@ void test01()
   errorstate = good;
   iterator_type ret03 = tim_get.get_year(is_it03, end, iss, errorstate,
                                         &time03);
-  VERIFY( time03.tm_year == 3 );
-  VERIFY( errorstate == ios_base::failbit );
+  VERIFY( time03.tm_year == 197 - 1900 );
+  VERIFY( errorstate == good );
   VERIFY( *ret03 == L'd' );
 
   iss.str(L"71d71");
--- libstdc++-v3/testsuite/22_locale/time_get/get_year/wchar_t/5.cc.jj  
2021-12-16 12:28:45.505246696 +0100
+++ libstdc++-v3/testsuite/22_locale/time_get/get_year/wchar_t/5.cc     
2021-12-16 13:50:29.931467983 +0100
@@ -49,12 +49,13 @@ void test01()
 
   const wstring str0 = L"1";
   tg.get_year(str0.begin(), str0.end(), iss, err, &tm0);
-  VERIFY( err == (failbit | eofbit) );
-  VERIFY( tm0.tm_year == 0 );
+  VERIFY( err == eofbit );
+  VERIFY( tm0.tm_year == 2001 - 1900 );
 
   const wstring str1 = L"1997 ";
+  err = goodbit;
   iter_type end1 = tg.get_year(str1.begin(), str1.end(), iss, err, &tm1);
-  VERIFY( err == (failbit | eofbit) );
+  VERIFY( err == goodbit );
   VERIFY( tm1.tm_year == time_sanity.tm_year );
   VERIFY( *end1 ==  L' ' );
 }
--- libstdc++-v3/testsuite/22_locale/time_get/get_year/wchar_t/6.cc.jj  
2021-12-16 13:29:10.402677678 +0100
+++ libstdc++-v3/testsuite/22_locale/time_get/get_year/wchar_t/6.cc     
2021-12-16 13:49:54.812967682 +0100
@@ -0,0 +1,79 @@
+// Copyright (C) 2001-2021 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3.  If not see
+// <http://www.gnu.org/licenses/>.
+
+// 22.2.5.1.1 time_get members
+
+#include <locale>
+#include <sstream>
+#include <testsuite_hooks.h>
+
+void test01()
+{
+  using namespace std;
+
+  typedef istreambuf_iterator<wchar_t> iterator_type;
+
+  locale loc_c = locale::classic();
+
+  iterator_type end;
+
+  wistringstream iss;
+  iss.imbue(loc_c);
+  const time_get<wchar_t>& tim_get = use_facet<time_get<wchar_t> 
>(iss.getloc());
+  ios_base::iostate errorstate = ios_base::goodbit;
+
+  iss.str(L"69");
+  iterator_type is_it01(iss);
+  tm time01;
+  tim_get.get_year(is_it01, end, iss, errorstate, &time01);
+  VERIFY( time01.tm_year == 1969 - 1900 );
+  VERIFY( errorstate == ios_base::eofbit );
+
+  iss.str(L"68 ");
+  iterator_type is_it02(iss);
+  tm time02;
+  errorstate = ios_base::goodbit;
+  iterator_type ret02 = tim_get.get_year(is_it02, end, iss, errorstate,
+                                        &time02);
+  VERIFY( time02.tm_year == 2068 - 1900 );
+  VERIFY( errorstate == ios_base::goodbit );
+  VERIFY( *ret02 == L' ' );
+
+  iss.str(L"0069");
+  iterator_type is_it03(iss);
+  tm time03;
+  errorstate = ios_base::goodbit;
+  iterator_type ret03 = tim_get.get_year(is_it03, end, iss, errorstate,
+                                        &time03);
+  VERIFY( time03.tm_year == 69 - 1900 );
+  VERIFY( errorstate == ios_base::eofbit );
+
+  iss.str(L"0068");
+  iterator_type is_it04(iss);
+  tm time04;
+  errorstate = ios_base::goodbit;
+  iterator_type ret04 = tim_get.get_year(is_it04, end, iss, errorstate,
+                                        &time04);
+  VERIFY( time04.tm_year == 68 - 1900 );
+  VERIFY( errorstate == ios_base::eofbit );
+}
+
+int main()
+{
+  test01();
+  return 0;
+}


        Jakub

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