diff --git a/date.h b/date.h
index 36091bc..6ca38c4 100644
--- a/date.h
+++ b/date.h
@@ -4128,8 +4128,17 @@ to_stream(std::basic_ostream<CharT, Traits>& os, const CharT* fmt,
                     detail::save_stream<CharT, Traits> _(os);
                     os.fill('0');
                     os.flags(std::ios::dec | std::ios::right);
-                    os.width(2);
-                    os << y/100;
+                    if (y >= 0)
+                    {
+                        os.width(2);
+                        os << y/100;
+                    }
+                    else
+                    {
+                        os << CharT{'-'};
+                        os.width(2);
+                        os << -(y-99)/100;
+                    }
                 }
                 else
                 {
diff --git a/test/date_test/format/century.pass.cpp b/test/date_test/format/century.pass.cpp
new file mode 100644
index 0000000..1daf264
--- /dev/null
+++ b/test/date_test/format/century.pass.cpp
@@ -0,0 +1,125 @@
+// The MIT License (MIT)
+//
+// Copyright (c) 2016 Howard Hinnant
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+
+#include "date.h"
+
+#include <cassert>
+#include <sstream>
+#include <type_traits>
+
+using fortnights = std::chrono::duration<date::weeks::rep,
+                                         std::ratio_multiply<std::ratio<2>,
+                                                             date::weeks::period>>;
+
+using microfortnights = std::chrono::duration<std::int64_t,
+                                              std::ratio_multiply<fortnights::period,
+                                                                  std::micro>>;
+
+int
+main()
+{
+    using namespace date;
+    using namespace std::chrono;
+    std::ostringstream os;
+    os << format("%C", sys_days{jun/1/20001});
+    assert(os.str() == "200");
+
+    os.str("");
+    os << format("%C", sys_days{jun/1/20000});
+    assert(os.str() == "200");
+
+    os.str("");
+    os << format("%C", sys_days{jun/1/19999});
+    assert(os.str() == "199");
+
+    os.str("");
+    os << format("%C", sys_days{jun/1/2001});
+    assert(os.str() == "20");
+
+    os.str("");
+    os << format("%C", sys_days{jun/1/2000});
+    assert(os.str() == "20");
+
+    os.str("");
+    os << format("%C", sys_days{jun/1/1999});
+    assert(os.str() == "19");
+
+    os.str("");
+    os << format("%C", sys_days{jun/1/101});
+    assert(os.str() == "01");
+
+    os.str("");
+    os << format("%C", sys_days{jun/1/100});
+    assert(os.str() == "01");
+
+    os.str("");
+    os << format("%C", sys_days{jun/1/99});
+    assert(os.str() == "00");
+
+    os.str("");
+    os << format("%C", sys_days{jun/1/1});
+    assert(os.str() == "00");
+
+    os.str("");
+    os << format("%C", sys_days{jun/1/0});
+    assert(os.str() == "00");
+
+    os.str("");
+    os << format("%C", sys_days{jun/1/-1});
+    assert(os.str() == "-01");
+
+    os.str("");
+    os << format("%C", sys_days{jun/1/-99});
+    assert(os.str() == "-01");
+
+    os.str("");
+    os << format("%C", sys_days{jun/1/-100});
+    assert(os.str() == "-01");
+
+    os.str("");
+    os << format("%C", sys_days{jun/1/-101});
+    assert(os.str() == "-02");
+
+    os.str("");
+    os << format("%C", sys_days{jun/1/-1999});
+    assert(os.str() == "-20");
+
+    os.str("");
+    os << format("%C", sys_days{jun/1/-2000});
+    assert(os.str() == "-20");
+
+    os.str("");
+    os << format("%C", sys_days{jun/1/-2001});
+    assert(os.str() == "-21");
+
+    os.str("");
+    os << format("%C", sys_days{jun/1/-19999});
+    assert(os.str() == "-200");
+
+    os.str("");
+    os << format("%C", sys_days{jun/1/-20000});
+    assert(os.str() == "-200");
+
+    os.str("");
+    os << format("%C", sys_days{jun/1/-20001});
+    assert(os.str() == "-201");
+}
diff --git a/test/date_test/format/range.pass.cpp b/test/date_test/format/range.pass.cpp
index 04beb4f..e6e5296 100644
--- a/test/date_test/format/range.pass.cpp
+++ b/test/date_test/format/range.pass.cpp
@@ -1,6 +1,6 @@
 // The MIT License (MIT)
 //
-// Copyright (c) 2015, 2016 Howard Hinnant
+// Copyright (c) 2016 Howard Hinnant
 //
 // Permission is hereby granted, free of charge, to any person obtaining a copy
 // of this software and associated documentation files (the "Software"), to deal
@@ -34,8 +34,6 @@ using microfortnights = std::chrono::duration<std::int64_t,
                                               std::ratio_multiply<fortnights::period,
                                                                   std::micro>>;
 
-#include <iostream>
-
 int
 main()
 {
@@ -69,6 +67,4 @@ main()
     os.str("");
     os << format("%F %T", sys_days{dec/last/year::max()} + microfortnights{1});
     assert(os.str() == "32767-12-31 00:00:01.2096");
-    os.str("");
-    os.str("");
 }