diff --git a/BizHawk.Emulation/Consoles/Nintendo/Gameboy/Gambatte.cs b/BizHawk.Emulation/Consoles/Nintendo/Gameboy/Gambatte.cs
index 4d2c63b9a3..9d0245f35f 100644
--- a/BizHawk.Emulation/Consoles/Nintendo/Gameboy/Gambatte.cs
+++ b/BizHawk.Emulation/Consoles/Nintendo/Gameboy/Gambatte.cs
@@ -24,6 +24,21 @@ namespace BizHawk.Emulation.Consoles.GB
 		/// </summary>
 		LibGambatte.Buttons CurrentButtons = 0;
 
+		/// <summary>
+		/// RTC time when emulation begins.
+		/// </summary>
+		long zerotime;
+
+		LibGambatte.RTCCallback TimeCallback;
+
+		long GetCurrentTime()
+		{
+			long fn = Frame;
+			fn /= 60; // exactly 60 fps.  in case you feel bad about it, remember that we're not exactly tracking cpu cycles either.
+			fn += zerotime;
+			return fn;
+		}
+
 		public Gameboy(CoreComm comm, GameInfo game, byte[] romdata)
 		{
 			CoreComm = comm;
@@ -53,7 +68,7 @@ namespace BizHawk.Emulation.Consoles.GB
 				flags |= LibGambatte.LoadFlags.MULTICART_COMPAT;
 
 
-			if (LibGambatte.gambatte_load(GambatteState, romdata, (uint)romdata.Length, flags) != 0)
+			if (LibGambatte.gambatte_load(GambatteState, romdata, (uint)romdata.Length, GetCurrentTime(), flags) != 0)
 				throw new Exception("gambatte_load() returned non-zero (is this not a gb or gbc rom?)");
 
 			// set real default colors (before anyone mucks with them at all)
@@ -77,6 +92,9 @@ namespace BizHawk.Emulation.Consoles.GB
 				Util.BytesToHexString(System.Security.Cryptography.SHA1.Create().ComputeHash(romdata)),
 				Util.BytesToHexString(System.Security.Cryptography.MD5.Create().ComputeHash(romdata))
 				);
+
+			TimeCallback = new LibGambatte.RTCCallback(GetCurrentTime);
+			LibGambatte.gambatte_setrtccallback(GambatteState, TimeCallback);
 		}
 
 		public static readonly ControllerDefinition GbController = new ControllerDefinition
@@ -143,7 +161,7 @@ namespace BizHawk.Emulation.Consoles.GB
 				r.RefreshWrite();
 
 			if (Controller["Power"])
-				LibGambatte.gambatte_reset(GambatteState);
+				LibGambatte.gambatte_reset(GambatteState, GetCurrentTime());
 
 			RefreshMemoryCallbacks();
 			if (CoreComm.Tracer.Enabled)
diff --git a/BizHawk.Emulation/Consoles/Nintendo/Gameboy/LibGambatte.cs b/BizHawk.Emulation/Consoles/Nintendo/Gameboy/LibGambatte.cs
index 0a862198ac..4e28fcce6d 100644
--- a/BizHawk.Emulation/Consoles/Nintendo/Gameboy/LibGambatte.cs
+++ b/BizHawk.Emulation/Consoles/Nintendo/Gameboy/LibGambatte.cs
@@ -39,10 +39,11 @@ namespace BizHawk.Emulation.Consoles.GB
 		/// <param name="core">opaque state pointer</param>
 		/// <param name="romdata">the rom data, can be disposed of once this function returns</param>
 		/// <param name="length">length of romdata in bytes</param>
+		/// <param name="now">RTC time when the rom is loaded</param>
 		/// <param name="flags">ORed combination of LoadFlags.</param>
 		/// <returns>0 on success, negative value on failure.</returns>
 		[DllImport("libgambatte.dll", CallingConvention = CallingConvention.Cdecl)]
-		public static extern int gambatte_load(IntPtr core, byte[] romdata, uint length, LoadFlags flags);
+		public static extern int gambatte_load(IntPtr core, byte[] romdata, uint length, long now, LoadFlags flags);
 
 		/// <summary>
 		/// Emulates until at least 'samples' stereo sound samples are produced in the supplied buffer,
@@ -74,8 +75,9 @@ namespace BizHawk.Emulation.Consoles.GB
 		/// Equivalent to reloading a ROM image, or turning a Game Boy Color off and on again.
 		/// </summary>
 		/// <param name="core">opaque state pointer</param>
+		/// <param name="now">RTC time when the reset occurs</param>
 		[DllImport("libgambatte.dll", CallingConvention = CallingConvention.Cdecl)]
-		public static extern void gambatte_reset(IntPtr core);
+		public static extern void gambatte_reset(IntPtr core, long now);
 
 		/// <summary>
 		/// palette type for gambatte_setdmgpalettecolor
@@ -191,6 +193,21 @@ namespace BizHawk.Emulation.Consoles.GB
 		[DllImport("libgambatte.dll", CallingConvention = CallingConvention.Cdecl)]
 		public static extern void gambatte_setscanlinecallback(IntPtr core, ScanlineCallback callback, int sl);
 
+		/// <summary>
+		/// type of the RTC callback
+		/// </summary>
+		/// <returns>what time is it, unixy</returns>
+		[UnmanagedFunctionPointer(CallingConvention.Cdecl)]
+		public delegate long RTCCallback();
+
+		/// <summary>
+		/// sets RTC callback.  probably mandatory.
+		/// </summary>
+		/// <param name="core">opaque state pointer</param>
+		/// <param name="callback">the callback</param>
+		[DllImport("libgambatte.dll", CallingConvention = CallingConvention.Cdecl)]
+		public static extern void gambatte_setrtccallback(IntPtr core, RTCCallback callback);
+
 		/// <summary>
 		/// Sets the directory used for storing save data. The default is the same directory as the ROM Image file.
 		/// </summary>
diff --git a/BizHawk.MultiClient/output/dll/libgambatte.dll b/BizHawk.MultiClient/output/dll/libgambatte.dll
index 72b7c33dd6..b6cd3b424b 100644
Binary files a/BizHawk.MultiClient/output/dll/libgambatte.dll and b/BizHawk.MultiClient/output/dll/libgambatte.dll differ
diff --git a/libgambatte/include/gambatte.h b/libgambatte/include/gambatte.h
index ee74f743c4..f425485825 100644
--- a/libgambatte/include/gambatte.h
+++ b/libgambatte/include/gambatte.h
@@ -23,6 +23,7 @@
 #include "gbint.h"
 #include <string>
 #include <sstream>
+#include <ctime>
 
 namespace gambatte {
 enum { BG_PALETTE = 0, SP1_PALETTE = 1, SP2_PALETTE = 2 };
@@ -44,7 +45,7 @@ public:
 	  * @param flags    ORed combination of LoadFlags.
 	  * @return 0 on success, negative value on failure.
 	  */
-	int load(const char *romfiledata, unsigned romfilelength, unsigned flags = 0);
+	int load(const char *romfiledata, unsigned romfilelength, std::time_t now, unsigned flags = 0);
 	
 	/** Emulates until at least 'samples' stereo sound samples are produced in the supplied buffer,
 	  * or until a video frame has been drawn.
@@ -73,7 +74,7 @@ public:
 	/** Reset to initial state.
 	  * Equivalent to reloading a ROM image, or turning a Game Boy Color off and on again.
 	  */
-	void reset();
+	void reset(std::time_t now);
 	
 	/** @param palNum 0 <= palNum < 3. One of BG_PALETTE, SP1_PALETTE and SP2_PALETTE.
 	  * @param colorNum 0 <= colorNum < 4
@@ -89,6 +90,7 @@ public:
 	void setWriteCallback(void (*callback)(unsigned));
 	void setTraceCallback(void (*callback)(void *));
 	void setScanlineCallback(void (*callback)(), int sl);
+	void setRTCCallback(std::time_t (*callback)());
 
 	/** Sets the directory used for storing save data. The default is the same directory as the ROM Image file. */
 	void setSaveDir(const std::string &sdir);
diff --git a/libgambatte/src/cinterface.cpp b/libgambatte/src/cinterface.cpp
index 7e1a3e39ff..306d047851 100644
--- a/libgambatte/src/cinterface.cpp
+++ b/libgambatte/src/cinterface.cpp
@@ -17,10 +17,10 @@ __declspec(dllexport) void gambatte_destroy(void *core)
 	delete g;
 }
 
-__declspec(dllexport) int gambatte_load(void *core, const char *romfiledata, unsigned romfilelength, unsigned flags)
+__declspec(dllexport) int gambatte_load(void *core, const char *romfiledata, unsigned romfilelength, long long now, unsigned flags)
 {
 	GB *g = (GB *) core;
-	int ret = g->load(romfiledata, romfilelength, flags);
+	int ret = g->load(romfiledata, romfilelength, now, flags);
 	return ret;
 }
 
@@ -33,10 +33,10 @@ __declspec(dllexport) long gambatte_runfor(void *core, unsigned long *videobuf,
 	return ret;
 }
 
-__declspec(dllexport) void gambatte_reset(void *core)
+__declspec(dllexport) void gambatte_reset(void *core, long long now)
 {
 	GB *g = (GB *) core;
-	g->reset();
+	g->reset(now);
 }
 
 __declspec(dllexport) void gambatte_setdmgpalettecolor(void *core, unsigned palnum, unsigned colornum, unsigned rgb32)
@@ -95,6 +95,12 @@ __declspec(dllexport) void gambatte_setscanlinecallback(void *core, void (*callb
 	g->setScanlineCallback(callback, sl);
 }
 
+__declspec(dllexport) void gambatte_setrtccallback(void *core, long long (*callback)())
+{
+	GB *g = (GB *) core;
+	g->setRTCCallback(callback);
+}
+
 __declspec(dllexport) void gambatte_setsavedir(void *core, const char *sdir)
 {
 	GB *g = (GB *) core;
diff --git a/libgambatte/src/cinterface.h b/libgambatte/src/cinterface.h
index f39117b03c..3487f39f57 100644
--- a/libgambatte/src/cinterface.h
+++ b/libgambatte/src/cinterface.h
@@ -8,11 +8,11 @@ extern "C"
 	__declspec(dllexport) void *gambatte_create();
 	__declspec(dllexport) void gambatte_destroy(void *core);
 
-	__declspec(dllexport) int gambatte_load(void *core, const char *romfiledata, unsigned romfilelength, unsigned flags);
+	__declspec(dllexport) int gambatte_load(void *core, const char *romfiledata, unsigned romfilelength, long long now, unsigned flags);
 
 	__declspec(dllexport) long gambatte_runfor(void *core, unsigned long *videobuf, int pitch, short *soundbuf, unsigned *samples);
 
-	__declspec(dllexport) void gambatte_reset(void *core);
+	__declspec(dllexport) void gambatte_reset(void *core, long long now);
 
 	__declspec(dllexport) void gambatte_setdmgpalettecolor(void *core, unsigned palnum, unsigned colornum, unsigned rgb32);
 
@@ -28,6 +28,8 @@ extern "C"
 
 	__declspec(dllexport) void gambatte_setscanlinecallback(void *core, void (*callback)(), int sl);
 
+	__declspec(dllexport) void gambatte_setrtccallback(void *core, long long (*callback)());
+
 	__declspec(dllexport) void gambatte_setsavedir(void *core, const char *sdir);
 
 	__declspec(dllexport) int gambatte_iscgb(void *core);
diff --git a/libgambatte/src/cpu.h b/libgambatte/src/cpu.h
index 4ef676d4e7..45979cd96e 100644
--- a/libgambatte/src/cpu.h
+++ b/libgambatte/src/cpu.h
@@ -82,6 +82,10 @@ public:
 	void setScanlineCallback(void (*callback)(), int sl) {
 		memory.setScanlineCallback(callback, sl);
 	}
+
+	void setRTCCallback(std::time_t (*callback)()) {
+		memory.setRTCCallback(callback);
+	}
 	
 	void setSaveDir(const std::string &sdir) {
 		memory.setSaveDir(sdir);
diff --git a/libgambatte/src/gambatte.cpp b/libgambatte/src/gambatte.cpp
index 67520439b7..02460fc07f 100644
--- a/libgambatte/src/gambatte.cpp
+++ b/libgambatte/src/gambatte.cpp
@@ -68,7 +68,7 @@ long GB::runFor(gambatte::uint_least32_t *const videoBuf, const int pitch,
 	return cyclesSinceBlit < 0 ? cyclesSinceBlit : static_cast<long>(samples) - (cyclesSinceBlit >> 1);
 }
 
-void GB::reset() {
+void GB::reset(const std::time_t now) {
 	if (p_->cpu.loaded()) {
 		
 		int length = p_->cpu.saveSavedataLength();
@@ -81,7 +81,7 @@ void GB::reset() {
 		
 		SaveState state;
 		p_->cpu.setStatePtrs(state);
-		setInitState(state, p_->cpu.isCgb(), p_->gbaCgbMode);
+		setInitState(state, p_->cpu.isCgb(), p_->gbaCgbMode, now);
 		p_->cpu.loadState(state);
 		if (length > 0)
 		{
@@ -111,11 +111,15 @@ void GB::setScanlineCallback(void (*callback)(), int sl) {
 	p_->cpu.setScanlineCallback(callback, sl);
 }
 
+void GB::setRTCCallback(long long (*callback)()) {
+	p_->cpu.setRTCCallback(callback);
+}
+
 void GB::setSaveDir(const std::string &sdir) {
 	p_->cpu.setSaveDir(sdir);
 }
 
-int GB::load(const char *romfiledata, unsigned romfilelength, const unsigned flags) {
+int GB::load(const char *romfiledata, unsigned romfilelength, const std::time_t now, const unsigned flags) {
 	//if (p_->cpu.loaded())
 	//	p_->cpu.saveSavedata();
 	
@@ -124,7 +128,7 @@ int GB::load(const char *romfiledata, unsigned romfilelength, const unsigned fla
 	if (!failed) {
 		SaveState state;
 		p_->cpu.setStatePtrs(state);
-		setInitState(state, p_->cpu.isCgb(), p_->gbaCgbMode = flags & GBA_CGB);
+		setInitState(state, p_->cpu.isCgb(), p_->gbaCgbMode = flags & GBA_CGB, now);
 		p_->cpu.loadState(state);
 		//p_->cpu.loadSavedata();
 		
diff --git a/libgambatte/src/initstate.cpp b/libgambatte/src/initstate.cpp
index 0d61e6656c..d6d9ad3a10 100644
--- a/libgambatte/src/initstate.cpp
+++ b/libgambatte/src/initstate.cpp
@@ -1147,7 +1147,7 @@ static void setInitialDmgIoamhram(unsigned char *const ioamhram) {
 
 } // anon namespace
 
-void gambatte::setInitState(SaveState &state, const bool cgb, const bool gbaCgbMode) {
+void gambatte::setInitState(SaveState &state, const bool cgb, const bool gbaCgbMode, const std::time_t now) {
 	static const unsigned char cgbObjpDump[0x40] = {
 		0x00, 0x00, 0xF2, 0xAB, 
 		0x61, 0xC2, 0xD9, 0xBA, 
@@ -1308,7 +1308,7 @@ void gambatte::setInitState(SaveState &state, const bool cgb, const bool gbaCgbM
 	state.spu.ch4.nr4 = 0;
 	state.spu.ch4.master = false;
 	
-	state.rtc.baseTime = std::time(0);
+	state.rtc.baseTime = now;
 	state.rtc.haltTime = state.rtc.baseTime;
 	state.rtc.dataDh = 0;
 	state.rtc.dataDl = 0;
diff --git a/libgambatte/src/initstate.h b/libgambatte/src/initstate.h
index 0aba30790a..c50e489fbb 100644
--- a/libgambatte/src/initstate.h
+++ b/libgambatte/src/initstate.h
@@ -19,8 +19,10 @@
 #ifndef INITSTATE_H
 #define INITSTATE_H
 
+#include <ctime>
+
 namespace gambatte {
-void setInitState(struct SaveState &state, bool cgb, bool gbaCgbMode);
+void setInitState(struct SaveState &state, bool cgb, bool gbaCgbMode, std::time_t now);
 }
 
 #endif
diff --git a/libgambatte/src/mem/cartridge.h b/libgambatte/src/mem/cartridge.h
index da78a47875..a0ebba7d86 100644
--- a/libgambatte/src/mem/cartridge.h
+++ b/libgambatte/src/mem/cartridge.h
@@ -93,6 +93,10 @@ public:
 	int loadROM(const char *romfiledata, unsigned romfilelength, bool forceDmg, bool multicartCompat);
 	const char * romTitle() const { return reinterpret_cast<const char *>(memptrs.romdata() + 0x134); }
 	void setGameGenie(const std::string &codes);
+
+	void setRTCCallback(std::time_t (*callback)()) {
+		rtc.setRTCCallback(callback);
+	}
 };
 
 }
diff --git a/libgambatte/src/mem/rtc.cpp b/libgambatte/src/mem/rtc.cpp
index 993db290e9..91bbcee0cf 100644
--- a/libgambatte/src/mem/rtc.cpp
+++ b/libgambatte/src/mem/rtc.cpp
@@ -33,12 +33,13 @@ Rtc::Rtc()
   dataM(0),
   dataS(0),
   enabled(false),
-  lastLatchData(false)
+  lastLatchData(false),
+  timeCB(0)
 {
 }
 
 void Rtc::doLatch() {
-	std::time_t tmp = ((dataDh & 0x40) ? haltTime : std::time(0)) - baseTime;
+	std::time_t tmp = ((dataDh & 0x40) ? haltTime : timeCB()) - baseTime;
 	
 	while (tmp > 0x1FF * 86400) {
 		baseTime += 0x1FF * 86400;
@@ -113,42 +114,42 @@ void Rtc::loadState(const SaveState &state) {
 }
 
 void Rtc::setDh(const unsigned new_dh) {
-	const std::time_t unixtime = (dataDh & 0x40) ? haltTime : std::time(0);
+	const std::time_t unixtime = (dataDh & 0x40) ? haltTime : timeCB();
 	const std::time_t old_highdays = ((unixtime - baseTime) / 86400) & 0x100;
 	baseTime += old_highdays * 86400;
 	baseTime -= ((new_dh & 0x1) << 8) * 86400;
 	
 	if ((dataDh ^ new_dh) & 0x40) {
 		if (new_dh & 0x40)
-			haltTime = std::time(0);
+			haltTime = timeCB();
 		else
-			baseTime += std::time(0) - haltTime;
+			baseTime += timeCB() - haltTime;
 	}
 }
 
 void Rtc::setDl(const unsigned new_lowdays) {
-	const std::time_t unixtime = (dataDh & 0x40) ? haltTime : std::time(0);
+	const std::time_t unixtime = (dataDh & 0x40) ? haltTime : timeCB();
 	const std::time_t old_lowdays = ((unixtime - baseTime) / 86400) & 0xFF;
 	baseTime += old_lowdays * 86400;
 	baseTime -= new_lowdays * 86400;
 }
 
 void Rtc::setH(const unsigned new_hours) {
-	const std::time_t unixtime = (dataDh & 0x40) ? haltTime : std::time(0);
+	const std::time_t unixtime = (dataDh & 0x40) ? haltTime : timeCB();
 	const std::time_t old_hours = ((unixtime - baseTime) / 3600) % 24;
 	baseTime += old_hours * 3600;
 	baseTime -= new_hours * 3600;
 }
 
 void Rtc::setM(const unsigned new_minutes) {
-	const std::time_t unixtime = (dataDh & 0x40) ? haltTime : std::time(0);
+	const std::time_t unixtime = (dataDh & 0x40) ? haltTime : timeCB();
 	const std::time_t old_minutes = ((unixtime - baseTime) / 60) % 60;
 	baseTime += old_minutes * 60;
 	baseTime -= new_minutes * 60;
 }
 
 void Rtc::setS(const unsigned new_seconds) {
-	const std::time_t unixtime = (dataDh & 0x40) ? haltTime : std::time(0);
+	const std::time_t unixtime = (dataDh & 0x40) ? haltTime : timeCB();
 	baseTime += (unixtime - baseTime) % 60;
 	baseTime -= new_seconds;
 }
diff --git a/libgambatte/src/mem/rtc.h b/libgambatte/src/mem/rtc.h
index c5b3b5a77e..f541a1ff2c 100644
--- a/libgambatte/src/mem/rtc.h
+++ b/libgambatte/src/mem/rtc.h
@@ -39,6 +39,7 @@ private:
 	unsigned char dataS;
 	bool enabled;
 	bool lastLatchData;
+	std::time_t (*timeCB)();
 	
 	void doLatch();
 	void doSwapActive();
@@ -84,6 +85,10 @@ public:
 		(this->*activeSet)(data);
 		*activeData = data;
 	}
+
+	void setRTCCallback(std::time_t (*callback)()) {
+		timeCB = callback;
+	}
 };
 
 }
diff --git a/libgambatte/src/memory.h b/libgambatte/src/memory.h
index bfd5188365..037eb524b8 100644
--- a/libgambatte/src/memory.h
+++ b/libgambatte/src/memory.h
@@ -166,6 +166,10 @@ public:
 		display.setScanlineCallback(callback, sl);
 	}
 
+	void setRTCCallback(std::time_t (*callback)()) {
+		cart.setRTCCallback(callback);
+	}
+
 	void setEndtime(unsigned long cc, unsigned long inc);
 	
 	void setSoundBuffer(uint_least32_t *const buf) { sound.setBuffer(buf); }
diff --git a/libgambatte/src/savestate.h b/libgambatte/src/savestate.h
index 1916c90606..3ed7e10a24 100644
--- a/libgambatte/src/savestate.h
+++ b/libgambatte/src/savestate.h
@@ -19,6 +19,8 @@
 #ifndef SAVESTATE_H
 #define SAVESTATE_H
 
+#include <ctime>
+
 namespace gambatte {
 
 class SaverList;
@@ -36,7 +38,7 @@ struct SaveState {
 		void set(T *ptr, const unsigned long sz) { this->ptr = ptr; this->sz = sz; }
 		
 		friend class SaverList;
-		friend void setInitState(SaveState &, bool, bool);
+		friend void setInitState(SaveState &, bool, bool, std::time_t);
 	};
 
 	struct CPU {