--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/foosdk/sdk/foobar2000/helpers/win-systemtime.cpp	Mon Jan 05 02:15:46 2026 -0500
@@ -0,0 +1,85 @@
+#include "StdAfx.h"
+#include "win-systemtime.h"
+#include <ctime>
+
+#ifdef _WIN32
+static void theSelfTest(); // has to be outside namespace
+#endif
+
+namespace winTimeWrapper {
+	uint64_t FileTimeToInt(FILETIME ft) {
+		return ((uint64_t)ft.dwLowDateTime) | ((uint64_t)ft.dwHighDateTime << 32);
+	}
+	FILETIME FileTimeFromInt(uint64_t i) {
+		return { (uint32_t)(i & 0xFFFFFFFF), (uint32_t)(i >> 32) };
+	}
+	bool SystemTimeToFileTime(const SYSTEMTIME* st, FILETIME* ft) {
+		struct tm tmTemp = {};
+		if (st->wYear < 1900) return false;
+		tmTemp.tm_year = st->wYear - 1900;
+		if (st->wMonth < 1 || st->wMonth > 12) return false;
+		tmTemp.tm_mon = st->wMonth - 1;
+		tmTemp.tm_mday = st->wDay;
+		tmTemp.tm_hour = st->wHour;
+		tmTemp.tm_min = st->wMinute;
+		tmTemp.tm_sec = st->wSecond;
+		tmTemp.tm_isdst = -1;
+
+		time_t timeTemp = mktime(&tmTemp);
+		uint64_t wintime = pfc::fileTimeUtoW(timeTemp);
+		wintime += (filetimestamp_1second_increment / 1000) * st->wMilliseconds;
+		auto ftTemp = FileTimeFromInt( wintime );
+		return LocalFileTimeToFileTime(&ftTemp, ft);
+	}
+	bool LocalFileTimeToFileTime(const FILETIME* lpLocalFileTime, FILETIME* lpFileTime) {
+		uint64_t t64 = FileTimeToInt(*lpLocalFileTime);
+
+		time_t rawtime = pfc::fileTimeWtoU(t64);
+		
+		auto gm = * gmtime(&rawtime);
+		auto loc = * localtime(&rawtime);
+
+		int64_t diff = (int64_t)mktime(&loc) - (int64_t)mktime(&gm);
+
+		*lpFileTime = FileTimeFromInt(t64 + diff * filetimestamp_1second_increment);
+		return true;
+	}
+
+#ifdef _WIN32
+	void selfTest() { theSelfTest(); }
+#endif
+}
+
+
+#ifdef _WIN32
+static void theSelfTest() {
+	uint64_t ft1, ft2;
+	auto ft_1s = filetimestamp_1second_increment;
+	{
+		SYSTEMTIME st = {};
+		st.wDay = 21; st.wMonth = 2; st.wYear = 2022;
+		st.wHour = 15; st.wMinute = 15;
+		FILETIME ft = {};
+		SystemTimeToFileTime(&st, &ft);
+		ft1 = *(uint64_t*)(&ft);
+	}
+	{
+		winTimeWrapper::SYSTEMTIME st = {};
+		st.wDay = 21; st.wMonth = 2; st.wYear = 2022;
+		st.wHour = 15; st.wMinute = 15;
+		winTimeWrapper::FILETIME ft = {};
+		winTimeWrapper::SystemTimeToFileTime(&st, &ft);
+		ft2 = winTimeWrapper::FileTimeToInt(ft);
+	}
+
+	if (ft1 < ft2) {
+		pfc::outputDebugLine(pfc::format("ahead by ", (ft2 - ft1) / ft_1s));
+	} else if (ft1 > ft2) {
+		pfc::outputDebugLine(pfc::format("behind by ", (ft1 - ft2) / ft_1s));
+	} else {
+		pfc::outputDebugLine("ok");
+	}
+
+	pfc::nop();
+}
+#endif