diff --git a/example/bench.cpp b/example/bench.cpp
index f0c819da..bf01a82d 100644
--- a/example/bench.cpp
+++ b/example/bench.cpp
@@ -17,16 +17,18 @@ int main(int argc, char* argv[])
 {
     const unsigned int howmany = argc <= 1 ? 500000 : atoi(argv[1]);
 
-    //std::string pattern = "%Y:%m:%d %H:%M:%S.%e ---> [%n:%l] %t";
-    //auto formatter = std::make_shared<details::pattern_formatter>(pattern);
+    //std::string pattern = "%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>() });
+    cout_logger.formatter(formatter);
     cout_logger.info() << "Hello logger " << 1234;
 
     auto nullsink = std::make_shared<sinks::null_sink_st>();
-    auto rotating = std::make_shared<sinks::rotating_file_sink_mt>("myrotating", "txt", 1024 * 1024 * 5, 5, 1);
+    auto rotating = std::make_shared<sinks::rotating_file_sink_mt>("myrotating", "txt", 1024 * 1024 * 5, 5, 100);
 
-    logger my_logger("my_logger", { rotating });
+    logger my_logger("my_logger", { nullsink }, formatter);
 
     auto start = system_clock::now();
     for (unsigned int i = 1; i <= howmany; ++i)
diff --git a/include/c11log/details/fast_istostr.h b/include/c11log/details/fast_istostr.h
index 50f2ad35..7f375edc 100644
--- a/include/c11log/details/fast_istostr.h
+++ b/include/c11log/details/fast_istostr.h
@@ -26,7 +26,7 @@ inline std::string& fast_itostr(int n, std::string& s, int padding)
 {
     if (n == 0)
     {
-        s = "0";
+        s = std::string(padding, '0');
         return s;
     }
 
diff --git a/include/c11log/details/fast_oss.h b/include/c11log/details/fast_oss.h
index e6b4a8d0..c16e37c1 100644
--- a/include/c11log/details/fast_oss.h
+++ b/include/c11log/details/fast_oss.h
@@ -143,6 +143,11 @@ public:
         _dev.sputn(s.data(), s.size());
     }
 
+    void write_data(const char* p, std::size_t size)
+    {
+        _dev.sputn(p, size);
+    }
+
     void write_str(const std::string& s)
     {
         _dev.sputn(s.data(), s.size());
diff --git a/include/c11log/details/line_logger.h b/include/c11log/details/line_logger.h
index 1f684a5d..c3fd5bd2 100644
--- a/include/c11log/details/line_logger.h
+++ b/include/c11log/details/line_logger.h
@@ -1,9 +1,8 @@
 #pragma once
 
-#include <sstream>
 #include "../common.h"
 #include "../logger.h"
-#include "fast_oss.h"
+#include "./fast_oss.h"
 
 
 // Line logger class - aggregates operator<< calls to fast ostream
diff --git a/include/c11log/details/log_msg.h b/include/c11log/details/log_msg.h
index 6faa4a5e..e52b8d9f 100644
--- a/include/c11log/details/log_msg.h
+++ b/include/c11log/details/log_msg.h
@@ -1,7 +1,7 @@
 #pragma once
 
 #include "../common.h"
-#include "fast_oss.h"
+#include "./fast_oss.h"
 
 namespace c11log
 {
diff --git a/include/c11log/details/os.h b/include/c11log/details/os.h
index c13fc495..11823644 100644
--- a/include/c11log/details/os.h
+++ b/include/c11log/details/os.h
@@ -3,6 +3,9 @@
 #include<string>
 #include<cstdio>
 #include<ctime>
+#ifdef _WIN32
+#include <Windows.h>
+#endif
 
 namespace c11log
 {
@@ -81,6 +84,17 @@ inline bool fopen_s(FILE** fp, const std::string& filename, const char* mode)
 #endif
 }
 
+inline float tz_offset()
+{
+#ifdef _WIN32
+    TIME_ZONE_INFORMATION tzinfo;
+    GetTimeZoneInformation(&tzinfo);
+    return tzinfo.Bias / -60.0f;
+#else
+    return 0.0f;
+#endif
+}
+
 
 } //os
 } //details
diff --git a/include/c11log/details/pattern_formatter.h b/include/c11log/details/pattern_formatter.h
index b9d2166c..5d4c4f92 100644
--- a/include/c11log/details/pattern_formatter.h
+++ b/include/c11log/details/pattern_formatter.h
@@ -6,10 +6,10 @@
 #include <vector>
 
 #include "../formatter.h"
-#include "log_msg.h"
-#include "fast_oss.h"
-#include "os.h"
-
+#include "./log_msg.h"
+#include "./fast_oss.h"
+#include "./os.h"
+#include "Windows.h"
 
 namespace c11log
 {
@@ -42,6 +42,101 @@ class level_formatter :public flag_formatter
 // Date time pattern appenders
 ///////////////////////////////////////////////////////////////////////
 
+static const char* ampm(const tm& t)
+{
+    return t.tm_hour >= 12 ? "PM" : "AM";
+}
+
+static int to12h(const tm& t)
+{
+    return t.tm_hour > 12 ? t.tm_hour - 12 : t.tm_hour;
+}
+
+//Abbreviated weekday name
+static const std::string days[] { "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat" };
+class a_formatter :public flag_formatter
+{
+    void format(details::log_msg& msg) override
+    {
+        msg.formatted.write_str(days[msg.tm_time.tm_wday]);
+    }
+};
+
+//Full weekday name
+static const std::string full_days[] { "Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday" };
+class A_formatter :public flag_formatter
+{
+    void format(details::log_msg& msg) override
+    {
+        msg.formatted.write_str(full_days[msg.tm_time.tm_wday]);
+    }
+};
+
+//Abbreviated month
+static const std::string  months[] { "Jan", "Feb", "Mar", "Apr", "May", "June", "July", "Aug", "Sept", "Oct", "Nov", "Dec" };
+class b_formatter :public flag_formatter
+{
+    void format(details::log_msg& msg) override
+    {
+        msg.formatted.write_str(months[msg.tm_time.tm_mon]);
+    }
+};
+
+//Full month name
+static const std::string full_months[] { "January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December" };
+class B_formatter :public flag_formatter
+{
+    void format(details::log_msg& msg) override
+    {
+        msg.formatted.write_str(full_months[msg.tm_time.tm_mon]);
+    }
+};
+
+//Date and time representation (Thu Aug 23 15:35:46 2014)
+class c_formatter :public flag_formatter
+{
+    void format(details::log_msg& msg) override
+    {
+        msg.formatted.write_str(days[msg.tm_time.tm_wday]);
+        msg.formatted.putc(' ');
+        msg.formatted.write_str(months[msg.tm_time.tm_mon]);
+        msg.formatted.putc(' ');
+        msg.formatted.write_int(msg.tm_time.tm_mday, 2);
+        msg.formatted.putc(' ');
+        msg.formatted.write_int(msg.tm_time.tm_hour, 2);
+        msg.formatted.putc(':');
+        msg.formatted.write_int(msg.tm_time.tm_min, 2);
+        msg.formatted.putc(':');
+        msg.formatted.write_int(msg.tm_time.tm_sec, 2);
+    }
+};
+
+
+// year - 2 digit
+class C_formatter :public flag_formatter
+{
+    void format(details::log_msg& msg) override
+    {
+        msg.formatted.write_int(msg.tm_time.tm_year%100, 2);
+    }
+};
+
+
+
+// Short MM/DD/YY date, equivalent to %m/%d/%y 08/23/01
+class D_formatter :public flag_formatter
+{
+    void format(details::log_msg& msg) override
+    {
+        msg.formatted.write_int(msg.tm_time.tm_mon + 1, 2);
+        msg.formatted.putc('/');
+        msg.formatted.write_int(msg.tm_time.tm_mday, 2);
+        msg.formatted.putc('/');
+        msg.formatted.write_int(msg.tm_time.tm_year % 100, 2);
+    }
+};
+
+
 // year - 4 digit
 class Y_formatter :public flag_formatter
 {
@@ -51,14 +146,6 @@ class Y_formatter :public flag_formatter
     }
 };
 
-// year - 2 digit
-class y_formatter :public flag_formatter
-{
-    void format(details::log_msg& msg) override
-    {
-        msg.formatted.write_int(msg.tm_time.tm_year, 2);
-    }
-};
 // month 1-12
 class m_formatter :public flag_formatter
 {
@@ -91,7 +178,7 @@ class I_formatter :public flag_formatter
 {
     void format(details::log_msg& msg) override
     {
-        msg.formatted.write_int((msg.tm_time.tm_hour + 1) % 1, 2);
+        msg.formatted.write_int(to12h(msg.tm_time), 2);
     }
 };
 
@@ -124,6 +211,61 @@ class e_formatter :public flag_formatter
     }
 };
 
+// AM/PM
+class p_formatter :public flag_formatter
+{
+    void format(details::log_msg& msg) override
+    {
+        msg.formatted.write_data(ampm(msg.tm_time), 2);
+    }
+};
+
+
+// 12 hour clock 02:55:02 pm
+class r_formatter :public flag_formatter
+{
+    void format(details::log_msg& msg) override
+    {
+        int hours = to12h(msg.tm_time);
+        msg.formatted.write_int(to12h(msg.tm_time), 2);
+        msg.formatted.putc(':');
+        msg.formatted.write_int(msg.tm_time.tm_min, 2);
+        msg.formatted.putc(':');
+        msg.formatted.write_int(msg.tm_time.tm_sec, 2);
+        msg.formatted.putc(' ');
+        msg.formatted.write_data(ampm(msg.tm_time), 2);
+    }
+};
+
+// 24-hour HH:MM time, equivalent to %H:%M
+class R_formatter :public flag_formatter
+{
+    void format(details::log_msg& msg) override
+    {
+        msg.formatted.write_int(msg.tm_time.tm_hour, 2);
+        msg.formatted.putc(':');
+        msg.formatted.write_int(msg.tm_time.tm_min, 2);
+
+    }
+};
+
+// ISO 8601 time format (HH:MM:SS), equivalent to %H:%M:%S
+class T_formatter :public flag_formatter
+{
+    void format(details::log_msg& msg) override
+    {
+        msg.formatted.write_int(msg.tm_time.tm_hour, 2);
+        msg.formatted.putc(':');
+        msg.formatted.write_int(msg.tm_time.tm_min, 2);
+        msg.formatted.putc(':');
+        msg.formatted.write_int(msg.tm_time.tm_sec, 2);
+
+    }
+};
+
+
+
+
 
 class t_formatter :public flag_formatter
 {
@@ -147,10 +289,11 @@ private:
 };
 
 
-class str_formatter :public flag_formatter
+//aggregate user chars to display as is
+class aggregate_formatter :public flag_formatter
 {
 public:
-    str_formatter()
+    aggregate_formatter()
     {}
     void add_ch(char ch)
     {
@@ -158,7 +301,7 @@ public:
     }
     void format(details::log_msg& msg) override
     {
-        msg.formatted << _str;
+        msg.formatted.write_str(_str);
     }
 private:
     std::string _str;
@@ -181,32 +324,41 @@ private:
 };
 }
 }
-
-
+///////////////////////////////////////////////////////////////////////////////
+// pattern_formatter inline impl
+///////////////////////////////////////////////////////////////////////////////
 inline c11log::details::pattern_formatter::pattern_formatter(const std::string& pattern)
 {
     compile_pattern(pattern);
 }
 
-
 inline void c11log::details::pattern_formatter::compile_pattern(const std::string& pattern)
 {
     auto end = pattern.end();
+    std::unique_ptr<aggregate_formatter> user_chars;
     for (auto it = pattern.begin(); it != end; ++it)
     {
         if (*it == '%')
         {
+            if (user_chars) //append user chars found so far
+                _formatters.push_back(std::move(user_chars));
+
             if (++it != end)
                 handle_flag(*it);
             else
-                return;
+                break;
         }
-        else
+        else // chars not following the % sign should be displayed as is
         {
-            // chars not following the % sign should be displayed as is
-            _formatters.push_back(std::unique_ptr<details::flag_formatter>(new details::ch_formatter(*it)));
+            if (!user_chars)
+                user_chars = std::unique_ptr<aggregate_formatter>(new aggregate_formatter());
+            user_chars->add_ch(*it);
         }
     }
+    if (user_chars) //append raw chars found so far
+    {
+        _formatters.push_back(std::move(user_chars));
+    }
 
 }
 inline void c11log::details::pattern_formatter::handle_flag(char flag)
@@ -217,54 +369,97 @@ inline void c11log::details::pattern_formatter::handle_flag(char flag)
     case 'n':
         _formatters.push_back(std::unique_ptr<details::flag_formatter>(new details::name_formatter()));
         break;
-    // message log level
+
     case 'l':
         _formatters.push_back(std::unique_ptr<details::flag_formatter>(new details::level_formatter()));
         break;
-    // message text
+
     case('t') :
         _formatters.push_back(std::unique_ptr<details::flag_formatter>(new details::t_formatter()));
         break;
-    // year
+
+    case('a') :
+        _formatters.push_back(std::unique_ptr<details::flag_formatter>(new details::a_formatter()));
+        break;
+
+    case('A') :
+        _formatters.push_back(std::unique_ptr<details::flag_formatter>(new details::A_formatter()));
+        break;
+
+    case('b'):
+    case('h') :
+        _formatters.push_back(std::unique_ptr<details::flag_formatter>(new details::b_formatter()));
+        break;
+
+    case('B') :
+        _formatters.push_back(std::unique_ptr<details::flag_formatter>(new details::B_formatter()));
+        break;
+    case('c') :
+        _formatters.push_back(std::unique_ptr<details::flag_formatter>(new details::c_formatter()));
+        break;
+
+    case('C') :
+        _formatters.push_back(std::unique_ptr<details::flag_formatter>(new details::C_formatter()));
+        break;
+
     case('Y') :
         _formatters.push_back(std::unique_ptr<details::flag_formatter>(new details::Y_formatter()));
         break;
-    // year 2 digits
-    case('y') :
-        _formatters.push_back(std::unique_ptr<details::flag_formatter>(new details::y_formatter()));
+
+    case('D') :
+    case('x') :
+
+        _formatters.push_back(std::unique_ptr<details::flag_formatter>(new details::D_formatter()));
         break;
-    // month
+
     case('m') :
-        // minute
         _formatters.push_back(std::unique_ptr<details::flag_formatter>(new details::m_formatter()));
         break;
-    // day in month
+
     case('d') :
         _formatters.push_back(std::unique_ptr<details::flag_formatter>(new details::d_formatter()));
         break;
-    // hour (24)
+
     case('H') :
         _formatters.push_back(std::unique_ptr<details::flag_formatter>(new details::H_formatter()));
         break;
-    // hour (12)
+
     case('I') :
         _formatters.push_back(std::unique_ptr<details::flag_formatter>(new details::I_formatter()));
         break;
-    // minutes
+
     case('M') :
         _formatters.push_back(std::unique_ptr<details::flag_formatter>(new details::M_formatter()));
         break;
-    // seconds
+
     case('S') :
         _formatters.push_back(std::unique_ptr<details::flag_formatter>(new details::S_formatter()));
         break;
-    // milliseconds part
+
     case('e'):
         _formatters.push_back(std::unique_ptr<details::flag_formatter>(new details::e_formatter()));
         break;
-    // % sign
-    case('%') :
+
+    case('p'):
+        _formatters.push_back(std::unique_ptr<details::flag_formatter>(new details::p_formatter()));
+        break;
+
+    case('r') :
+        _formatters.push_back(std::unique_ptr<details::flag_formatter>(new details::r_formatter()));
+        break;
+
+    case('R') :
+        _formatters.push_back(std::unique_ptr<details::flag_formatter>(new details::R_formatter()));
+        break;
+
+    case('T') :
+    case('X'):
+        _formatters.push_back(std::unique_ptr<details::flag_formatter>(new details::T_formatter()));
+        break;
+
+    default: //Unkown flag appears as is
         _formatters.push_back(std::unique_ptr<details::flag_formatter>(new details::ch_formatter('%')));
+        _formatters.push_back(std::unique_ptr<details::flag_formatter>(new details::ch_formatter(flag)));
         break;
     }
 }
diff --git a/include/c11log/sinks/async_sink.h b/include/c11log/sinks/async_sink.h
index 9006043e..ea0c504c 100644
--- a/include/c11log/sinks/async_sink.h
+++ b/include/c11log/sinks/async_sink.h
@@ -5,7 +5,7 @@
 #include <atomic>
 #include <algorithm>
 
-#include "base_sink.h"
+#include "./base_sink.h"
 #include "../logger.h"
 #include "../details/blocking_queue.h"
 #include "../details/null_mutex.h"
diff --git a/include/c11log/sinks/base_sink.h b/include/c11log/sinks/base_sink.h
index d7b05783..43aa4c8a 100644
--- a/include/c11log/sinks/base_sink.h
+++ b/include/c11log/sinks/base_sink.h
@@ -3,7 +3,7 @@
 #include<string>
 #include<mutex>
 #include<atomic>
-#include "sink.h"
+#include "./sink.h"
 #include "../formatter.h"
 #include "../common.h"
 #include "../details/log_msg.h"
diff --git a/include/c11log/sinks/file_sinks.h b/include/c11log/sinks/file_sinks.h
index f732f92f..c4c57225 100644
--- a/include/c11log/sinks/file_sinks.h
+++ b/include/c11log/sinks/file_sinks.h
@@ -3,7 +3,7 @@
 #include <fstream>
 #include <sstream>
 #include  <iomanip>
-#include "base_sink.h"
+#include "./base_sink.h"
 #include <mutex>
 #include "../details/null_mutex.h"
 #include "../details/flush_helper.h"
diff --git a/include/c11log/sinks/null_sink.h b/include/c11log/sinks/null_sink.h
index 30c62714..b8b798cd 100644
--- a/include/c11log/sinks/null_sink.h
+++ b/include/c11log/sinks/null_sink.h
@@ -1,6 +1,6 @@
 #pragma once
 #include <mutex>
-#include "base_sink.h"
+#include "./base_sink.h"
 #include "../details/null_mutex.h"
 
 
diff --git a/include/c11log/sinks/ostream_sink.h b/include/c11log/sinks/ostream_sink.h
index a11fc988..2332a8a1 100644
--- a/include/c11log/sinks/ostream_sink.h
+++ b/include/c11log/sinks/ostream_sink.h
@@ -5,7 +5,7 @@
 #include <memory>
 
 #include "../details/null_mutex.h"
-#include "base_sink.h"
+#include "./base_sink.h"
 
 namespace c11log
 {
diff --git a/include/c11log/sinks/stdout_sinks.h b/include/c11log/sinks/stdout_sinks.h
index 8ab13255..0dfa6934 100644
--- a/include/c11log/sinks/stdout_sinks.h
+++ b/include/c11log/sinks/stdout_sinks.h
@@ -2,7 +2,7 @@
 
 #include <iostream>
 #include <mutex>
-#include "ostream_sink.h"
+#include "./ostream_sink.h"
 #include "../details/null_mutex.h"
 
 namespace c11log