diff --git a/example/bench.cpp b/example/bench.cpp
index bf01a82d..862e26c4 100644
--- a/example/bench.cpp
+++ b/example/bench.cpp
@@ -17,8 +17,8 @@ int main(int argc, char* argv[])
 {
     const unsigned int howmany = argc <= 1 ? 500000 : atoi(argv[1]);
 
-    //std::string pattern = "%B %d, %Y %H:%M:%S.%e **************[%n:%l] %t";
-    std::string pattern = " [%z] %t";
+    std::string pattern = "%z %B %d, %Y %H:%M:%S.%e **************[%n:%l] %t";
+    //std::string pattern = " [%z] %t";
     auto formatter = std::make_shared<details::pattern_formatter>(pattern);
 
     logger cout_logger("bench", { std::make_shared<sinks::stderr_sink_mt>() });
diff --git a/example/example.cpp b/example/example.cpp
index 55b17ed8..d4b04b16 100644
--- a/example/example.cpp
+++ b/example/example.cpp
@@ -17,7 +17,7 @@ details::fast_oss f(const std::string& what)
     oss << what;
     return oss;
 }
-int main_(int, char* [])
+int main(int, char* [])
 {
 
     auto foss = f("test2");
diff --git a/include/c11log/details/fast_oss.h b/include/c11log/details/fast_oss.h
index 0781bf63..f90a2a8c 100644
--- a/include/c11log/details/fast_oss.h
+++ b/include/c11log/details/fast_oss.h
@@ -149,9 +149,9 @@ public:
         _dev.sputn(s.data(), s.size());
     }
 
-    void put_data(const char* p, std::size_t size)
+    void put_data(const char* p, std::size_t data_size)
     {
-        _dev.sputn(p, size);
+        _dev.sputn(p, data_size);
     }
 
     void put_str(const std::string& s)
diff --git a/include/c11log/details/os.h b/include/c11log/details/os.h
index 71a6c0c1..512adf54 100644
--- a/include/c11log/details/os.h
+++ b/include/c11log/details/os.h
@@ -42,7 +42,7 @@ inline std::tm gmtime(const std::time_t &time_tt)
     gmtime_s(&tm, &time_tt);
 #else
     std::tm tm;
-    lgmtime_r(&time_tt, &tm);
+    gmtime_r(&time_tt, &tm);
 #endif
     return tm;
 }
diff --git a/include/c11log/details/pattern_formatter.h b/include/c11log/details/pattern_formatter.h
index 2578b0fe..c096456d 100644
--- a/include/c11log/details/pattern_formatter.h
+++ b/include/c11log/details/pattern_formatter.h
@@ -225,7 +225,6 @@ class r_formatter :public flag_formatter
 {
     void format(details::log_msg& msg) override
     {
-        int hours = to12h(msg.tm_time);
         msg.formatted.put_int(to12h(msg.tm_time), 2);
         msg.formatted.putc(':');
         msg.formatted.put_int(msg.tm_time.tm_min, 2);