diff --git a/src/computer.h b/src/computer.h
index 7d842bf..e556991 100644
--- a/src/computer.h
+++ b/src/computer.h
@@ -4,6 +4,7 @@
 #include "neonucleus.h"
 
 typedef struct nn_computer {
+    char state;
     nn_component *components;
     size_t componentLen;
     size_t componentCap;
@@ -15,6 +16,8 @@ typedef struct nn_computer {
     nn_architecture *nextArch;
     nn_architecture supportedArch[NN_MAX_ARCHITECTURES];
     size_t supportedArchCount;
+    double timeOffset;
+    nn_universe *universe;
 } nn_computer;
 
 #endif
diff --git a/src/neonucleus.h b/src/neonucleus.h
index 80d8af3..b24e757 100644
--- a/src/neonucleus.h
+++ b/src/neonucleus.h
@@ -5,6 +5,43 @@
 #include <stdint.h>
 #include <stdbool.h>
 
+// Based off https://stackoverflow.com/questions/5919996/how-to-detect-reliably-mac-os-x-ios-linux-windows-in-c-preprocessor
+#if defined(WIN32) || defined(_WIN32) || defined(__WIN32__) || defined(__NT__)
+   //define something for Windows (32-bit and 64-bit, this part is common)
+   #ifdef _WIN64
+        #define NN_WINDOWS
+   #else
+        #error "Windows 32-bit is not supported"
+   #endif
+#elif __APPLE__
+    #include <TargetConditionals.h>
+    #if TARGET_IPHONE_SIMULATOR
+        #error "iPhone Emulators are not supported"
+    #elif TARGET_OS_MACCATALYST
+        // I guess?
+        #define NN_MACOS
+    #elif TARGET_OS_IPHONE
+        #error "iPhone are not supported"
+    #elif TARGET_OS_MAC
+        #define NN_MACOS
+    #else
+        #error "Unknown Apple platform"
+    #endif
+#elif __ANDROID__
+    #error "Android is not supported"
+#elif __linux__
+    #define NN_LINUX
+#endif
+
+#if __unix__ // all unices not caught above
+    // Unix
+    #define NN_UNIX
+    #define NN_POSIX
+#elif defined(_POSIX_VERSION)
+    // POSIX
+    #define NN_POSIX
+#endif
+
 // The entire C API, in one header
 
 // Magic limits
@@ -98,14 +135,19 @@ void nn_lock(nn_guard *guard);
 void nn_unlock(nn_guard *guard);
 void nn_deleteGuard(nn_guard *guard);
 
+double nn_realTime();
+double nn_realTimeClock(void *_);
+
+typedef double nn_clock_t(void *_);
+
 nn_universe *nn_newUniverse();
 void nn_unsafeDeleteUniverse(nn_universe *universe);
 void *nn_queryUserdata(nn_universe *universe, const char *name);
 void nn_storeUserdata(nn_universe *universe, const char *name, void *data);
+void nn_setClock(nn_universe *universe, nn_clock_t *clock, void *userdata);
 
 nn_computer *nn_newComputer(nn_universe *universe, nn_address address, nn_architecture *arch, void *userdata, size_t memoryLimit, size_t componentLimit);
 void nn_tickComputer(nn_computer *computer);
-void nn_setUptime(nn_computer *computer, double uptime);
 double nn_getUptime(nn_computer *computer);
 size_t nn_getComputerMemoryUsed(nn_computer *computer);
 size_t nn_getComputerMemoryTotal(nn_computer *computer);
@@ -121,6 +163,7 @@ void nn_popSignal(nn_computer *computer);
 void nn_addUser(nn_computer *computer, const char *name);
 void nn_deleteUser(nn_computer *computer, const char *name);
 const char *nn_indexUser(nn_computer *computer, size_t idx);
+bool nn_isUser(nn_computer *computer, const char *name);
 
 /// This means the computer has not yet started.
 /// This is used to determine whether newComponent and removeComponent should emit signals.
@@ -158,12 +201,6 @@ const char *nn_indexUser(nn_computer *computer, size_t idx);
 int nn_getState(nn_computer *computer);
 void nn_setState(nn_computer *computer, int state);
 
-size_t nn_countUsers(nn_computer *computer);
-bool nn_isUser(nn_computer *computer, const char *user);
-void nn_addUser(nn_computer *computer, const char *user);
-void nn_removeUser(nn_computer *computer, const char *user);
-const char *nn_getUser(nn_computer *computer, size_t idx);
-
 void nn_setEnergyInfo(nn_computer *computer, size_t energy, size_t capacity);
 size_t nn_getEnergy(nn_computer *computer);
 void nn_removeEnergy(nn_computer *computer, size_t energy);
diff --git a/src/universe.c b/src/universe.c
index fd8ac8f..512f852 100644
--- a/src/universe.c
+++ b/src/universe.c
@@ -1,16 +1,7 @@
 #include "neonucleus.h"
+#include "universe.h"
 #include <string.h>
 
-typedef struct nn_universe_udata {
-    char *name;
-    void *userdata;
-} nn_universe_udata;
-
-typedef struct nn_universe {
-    nn_universe_udata udata[NN_MAX_USERDATA];
-    size_t udataLen;
-} nn_universe;
-
 nn_universe *nn_newUniverse() {
     nn_universe *u = nn_malloc(sizeof(nn_universe));
     if(u == NULL) return u;
diff --git a/src/universe.h b/src/universe.h
index 9f3eed3..7e5aee4 100644
--- a/src/universe.h
+++ b/src/universe.h
@@ -3,6 +3,16 @@
 
 #include "neonucleus.h"
 
-typedef struct nn_universe nn_universe;
+typedef struct nn_universe_udata {
+    char *name;
+    void *userdata;
+} nn_universe_udata;
+
+typedef struct nn_universe {
+    nn_universe_udata udata[NN_MAX_USERDATA];
+    size_t udataLen;
+    nn_clock_t *currentClock;
+    void *clockUserdata;
+} nn_universe;
 
 #endif
diff --git a/src/utils.c b/src/utils.c
index a348467..1fbf7a8 100644
--- a/src/utils.c
+++ b/src/utils.c
@@ -2,6 +2,12 @@
 #include <stdlib.h>
 #include <string.h>
 
+#ifdef NN_POSIX
+#include <time.h>
+#else
+#include <windows.h>
+#endif
+
 void *nn_malloc(size_t size) {
     return malloc(size);
 }
@@ -27,3 +33,30 @@ void *nn_memdup(const void *buf, size_t len) {
     if(m == NULL) return m;
     return memcpy(m, buf, len);
 }
+
+#ifdef NN_POSIX
+
+double nn_realTime() {
+    struct timespec time;
+    if(clock_gettime(CLOCK_MONOTONIC, &time) < 0) return 0; // oh no
+    return time.tv_sec + ((double)time.tv_nsec) / 1e9;
+}
+
+#else
+
+
+double nn_realTime() {
+    LARGE_INTEGER frequency = {0};
+    if(!QueryPerformanceFrequency(&frequency)) return 0;
+
+    LARGE_INTEGER now = {0};
+    if(!QueryPerformanceCounter(&now)) return 0;
+
+    return (double)now.QuadPart / frequency.QuadPart;
+}
+
+#endif
+
+double nn_realTimeClock(void *_) {
+    return nn_realTime();
+}