re organisation

apps/LoopThroughWithOpenGLCompositing/runtime/telemetry/RuntimeClock.cpp

@@ -0,0 +1,45 @@
+#include "RuntimeClock.h"
+
+#include <chrono>
+
+namespace
+{
+bool ToUtcTime(std::time_t time, std::tm& utcTime)
+{
+	return gmtime_s(&utcTime, &time) == 0;
+}
+
+bool ToLocalTime(std::time_t time, std::tm& localTime)
+{
+	return localtime_s(&localTime, &time) == 0;
+}
+}
+
+RuntimeClockSnapshot GetRuntimeClockSnapshot()
+{
+	return MakeRuntimeClockSnapshot(std::chrono::system_clock::to_time_t(std::chrono::system_clock::now()));
+}
+
+RuntimeClockSnapshot MakeRuntimeClockSnapshot(std::time_t now)
+{
+	RuntimeClockSnapshot snapshot;
+
+	std::tm utcTime = {};
+	if (!ToUtcTime(now, utcTime))
+		return snapshot;
+
+	snapshot.utcTimeSeconds =
+		static_cast<double>(utcTime.tm_hour * 3600 + utcTime.tm_min * 60 + utcTime.tm_sec);
+
+	std::tm localTime = {};
+	if (!ToLocalTime(now, localTime))
+		return snapshot;
+
+	utcTime.tm_isdst = localTime.tm_isdst;
+	const std::time_t localAsTime = std::mktime(&localTime);
+	const std::time_t utcAsLocalTime = std::mktime(&utcTime);
+	if (localAsTime != static_cast<std::time_t>(-1) && utcAsLocalTime != static_cast<std::time_t>(-1))
+		snapshot.utcOffsetSeconds = std::difftime(localAsTime, utcAsLocalTime);
+
+	return snapshot;
+}