From ad537ccd525fd3af759febd6c0936f82de808a70 Mon Sep 17 00:00:00 2001
From: Jonathan Wakely <jwakely@redhat.com>
Date: Wed, 13 Dec 2023 12:00:45 +0000
Subject: [PATCH] libstdc++: Fix regression in std::format output of %Y for
negative years
The change in r14-6468-ga01462ae8bafa8 was only supposed to apply to %C
formats, not %Y.
libstdc++-v3/ChangeLog:
* include/bits/chrono_io.h (__formatter_chrono::_M_C_y_Y): Do
not round century down for %Y formats.
---
libstdc++-v3/include/bits/chrono_io.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/libstdc++-v3/include/bits/chrono_io.h b/libstdc++-v3/include/bits/chrono_io.h
index b63b8592ebac..bcd76e4ab7b0 100644
--- a/libstdc++-v3/include/bits/chrono_io.h
+++ b/libstdc++-v3/include/bits/chrono_io.h
@@ -825,7 +825,7 @@ namespace __format
{
__s.assign(1, _S_plus_minus[1]);
// For floored division -123//100 is -2 and -100//100 is -1
- if ((__ci * 100) != __yi)
+ if (__conv == 'C' && (__ci * 100) != __yi)
++__ci;
}
if (__ci >= 100) [[unlikely]]
--
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