diff --git a/src/util/format/builder.cpp b/src/util/format/builder.cpp
index 49d7664..991938f 100644
--- a/src/util/format/builder.cpp
+++ b/src/util/format/builder.cpp
@@ -36,7 +36,6 @@ void Builder::putF32(float number, size_t precision) const
 		<< number
 		<< std::defaultfloat << std::setprecision(6);
 	std::string string = stream.str();
-	string = string.substr(0, string.find_first_of('0', string.find('.')));
 	m_builder << string;
 }
 
@@ -50,7 +49,6 @@ void Builder::putF64(double number, size_t precision) const
 		<< number
 		<< std::defaultfloat << std::setprecision(6);
 	std::string string = stream.str();
-	string = string.substr(0, string.find_first_of('0', string.find('.')));
 	m_builder << string;
 }
 
diff --git a/src/util/format/log.cpp b/src/util/format/log.cpp
new file mode 100644
index 0000000..7e2a47c
--- /dev/null
+++ b/src/util/format/log.cpp
@@ -0,0 +1,109 @@
+/*
+ * Copyright (C) 2022 Riyyi
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
+#include <cstdio> // FILE
+#include <string>
+
+#include "util/format/color.h"
+#include "util/format/log.h"
+
+namespace Util::Format {
+
+std::string formatTimeElapsed()
+{
+	return format("{:.3}s ", s_timer.elapsedNanoseconds() / 1000000000.0);
+}
+
+std::string formatType(Type type)
+{
+	std::string output;
+
+	formatTo(output, "[");
+	switch (type) {
+	case Type::Trace:
+		formatTo(output, "trace");
+		break;
+	case Type::Debug:
+		formatTo(output, fg(TerminalColor::Magenta), "debug");
+		break;
+	case Type::Success:
+		formatTo(output, fg(TerminalColor::Green), "success");
+		break;
+	case Type::Info:
+		formatTo(output, fg(TerminalColor::Blue), "info");
+		break;
+	case Type::Warn:
+		formatTo(output, Emphasis::Bold | fg(TerminalColor::Yellow), "warn");
+		break;
+	case Type::Error:
+		formatTo(output, Emphasis::Bold | fg(TerminalColor::Red), "error");
+		break;
+	case Type::Critical:
+		formatTo(output, Emphasis::Bold | fg(TerminalColor::White) | bg(TerminalColor::Red), "critical");
+		break;
+	default:
+		break;
+	};
+	formatTo(output, "] ");
+
+	return output;
+}
+
+// -----------------------------------------
+
+LogOperatorStyle::LogOperatorStyle(FILE* file, Type type)
+	: m_file(file)
+	, m_type(type)
+	, m_stream()
+	, m_builder(m_stream)
+{
+	m_stream << formatTimeElapsed();
+	m_stream << formatType(type);
+}
+
+LogOperatorStyle::~LogOperatorStyle()
+{
+	m_stream.write("\n", 1);
+	std::string string = m_stream.str();
+	fputs(string.c_str(), m_file);
+}
+
+LogOperatorStyle trace()
+{
+	return LogOperatorStyle(stdout, Type::Trace);
+}
+
+LogOperatorStyle debug()
+{
+	return LogOperatorStyle(stdout, Type::Debug);
+}
+
+LogOperatorStyle success()
+{
+	return LogOperatorStyle(stdout, Type::Success);
+}
+
+LogOperatorStyle info()
+{
+	return LogOperatorStyle(stdout, Type::Info);
+}
+
+LogOperatorStyle warn()
+{
+	return LogOperatorStyle(stderr, Type::Warn);
+}
+
+LogOperatorStyle error()
+{
+	return LogOperatorStyle(stderr, Type::Error);
+}
+
+LogOperatorStyle critical()
+{
+	return LogOperatorStyle(stderr, Type::Critical);
+}
+
+} // namespace Util::Format
diff --git a/src/util/format/log.h b/src/util/format/log.h
new file mode 100644
index 0000000..509a839
--- /dev/null
+++ b/src/util/format/log.h
@@ -0,0 +1,97 @@
+/*
+ * Copyright (C) 2022 Riyyi
+ *
+ * SPDX-License-Identifier: MIT
+ */
+
+#pragma once
+
+#include <cstdio> // FILE, stderr, stdout
+#include <string>
+#include <string_view>
+
+#include "util/format/format.h"
+#include "util/format/print.h"
+#include "util/timer.h"
+
+namespace Util::Format {
+
+static Util::Timer s_timer;
+
+enum class Type : uint8_t {
+	Trace,    // White
+	Debug,    // Purple
+	Success,  // Green
+	Info,     // Blue
+	Warn,     // Bold yellow
+	Error,    // Bold red
+	Critical, // Bold on red
+};
+
+std::string formatTimeElapsed();
+std::string formatType(Type type);
+
+#define LOG_FUNCTION(name, file, type)                                 \
+	template<size_t N, typename... Parameters>                         \
+	void name(const char(&format)[N], const Parameters&... parameters) \
+	{                                                                  \
+		print(file, "{}", formatTimeElapsed());                        \
+		print(file, "{}", formatType(type));                           \
+		VariadicParameters variadicParameters { parameters... };       \
+		print(file, format, variadicParameters);                       \
+		print(file, "\n");                                             \
+	}
+
+LOG_FUNCTION(trace, stdout, Type::Trace);
+LOG_FUNCTION(debug, stdout, Type::Debug);
+LOG_FUNCTION(success, stdout, Type::Success);
+LOG_FUNCTION(info, stdout, Type::Info);
+LOG_FUNCTION(warn, stderr, Type::Warn);
+LOG_FUNCTION(error, stderr, Type::Error);
+LOG_FUNCTION(critical, stderr, Type::Critical);
+
+// -----------------------------------------
+
+class LogOperatorStyle {
+public:
+	LogOperatorStyle(FILE* file, Type type);
+	virtual ~LogOperatorStyle();
+
+	Builder& builder() { return m_builder; }
+
+private:
+	FILE* m_file;
+	Type m_type;
+
+	std::stringstream m_stream;
+	Builder m_builder;
+};
+
+template<typename T>
+const LogOperatorStyle& operator<<(const LogOperatorStyle& logOperatorStyle, const T& value)
+{
+	_format(const_cast<LogOperatorStyle&>(logOperatorStyle).builder(), value);
+	return logOperatorStyle;
+}
+
+LogOperatorStyle trace();
+LogOperatorStyle debug();
+LogOperatorStyle success();
+LogOperatorStyle info();
+LogOperatorStyle warn();
+LogOperatorStyle error();
+LogOperatorStyle critical();
+
+} // namespace Util::Format
+
+namespace Util {
+
+using Util::Format::critical;
+using Util::Format::debug;
+using Util::Format::error;
+using Util::Format::info;
+using Util::Format::success;
+using Util::Format::trace;
+using Util::Format::warn;
+
+} // namespace Util
diff --git a/test/unit/testutilformat.cpp b/test/unit/testutilformat.cpp
index 9dcc183..0a3ed4f 100644
--- a/test/unit/testutilformat.cpp
+++ b/test/unit/testutilformat.cpp
@@ -85,7 +85,7 @@ TEST_CASE(FormatNumbers)
 
 	float f32R = 245789.70000;
 	result = Util::format("{}", f32R);
-	EXPECT_EQ(result, "245789.7");
+	EXPECT_EQ(result, "245789.703125");
 
 	float f32 = 45645.3233;
 	result = Util::format("{}", f32);
@@ -93,11 +93,11 @@ TEST_CASE(FormatNumbers)
 
 	double f64 = 87522.300000000;
 	result = Util::format("{}", f64);
-	EXPECT_EQ(result, "87522.3");
+	EXPECT_EQ(result, "87522.300000");
 
 	double pi = 3.14159265359;
 	result = Util::format("{:.15}", pi);
-	EXPECT_EQ(result, "3.14159265359");
+	EXPECT_EQ(result, "3.141592653590000");
 }
 
 TEST_CASE(FormatContainers)