diff --git a/code/os/win/win.h b/code/os/win/win.h
index 1cebe50..8a0186c 100644
--- a/code/os/win/win.h
+++ b/code/os/win/win.h
@@ -7,3 +7,5 @@
 struct _os_heap {
     HANDLE handle;
 };
+
+void _os_timing_init(void);
\ No newline at end of file
diff --git a/code/os/win/win_entry.c b/code/os/win/win_entry.c
index 5fa2b44..9d389e1 100644
--- a/code/os/win/win_entry.c
+++ b/code/os/win/win_entry.c
@@ -35,6 +35,8 @@ static bool convert_wide_chars_to_ansi(char* out, const wchar_t* str, size_t len
 }
 
 void mainCRTStartup() {
+    _os_timing_init();
+
     HANDLE heap = GetProcessHeap();
     if (heap == NULL) {
         ExitProcess(-42069);
diff --git a/code/os/win/win_time.c b/code/os/win/win_time.c
new file mode 100644
index 0000000..b84ea34
--- /dev/null
+++ b/code/os/win/win_time.c
@@ -0,0 +1,55 @@
+#include <time.h>
+#include <stdint.h>
+#include "win.h"
+
+// Store the time since we started running the process
+static uint64_t timer_freq;
+static uint64_t timer_start;
+
+int timespec_get(struct timespec *ts, int base) {
+    if (base != TIME_UTC) return 0;
+
+    FILETIME ft;
+    GetSystemTimeAsFileTime(&ft);
+
+    ULARGE_INTEGER s = {
+        .LowPart = ft.dwLowDateTime,
+        .HighPart = ft.dwHighDateTime
+    };
+
+    ULONGLONG t = s.QuadPart - 116444736000000000ULL;
+    ts->tv_sec = t / 10000000;
+    ts->tv_nsec = ((int) (t % 10000000)) * 100;
+    return base;
+}
+
+clock_t clock(void) {
+    LARGE_INTEGER curr;
+    if (!QueryPerformanceCounter(&curr)) {
+        return -1;
+    }
+
+    // time travel?
+    if (curr.QuadPart < timer_start) {
+        return -1;
+    }
+
+    uint64_t time_from_start = curr.QuadPart - timer_start;
+
+    uint64_t scaled_millis = (time_from_start / timer_freq) * CLOCKS_PER_SEC;
+    // helps reduce error when doing integer division
+    scaled_millis += ((time_from_start % timer_freq) * CLOCKS_PER_SEC) / timer_freq;
+
+    return scaled_millis;
+}
+
+void _os_timing_init(void) {
+    LARGE_INTEGER freq, start;
+    if (QueryPerformanceFrequency(&freq) && QueryPerformanceCounter(&start)) {
+        timer_start = start.QuadPart;
+        timer_freq  = freq.QuadPart;
+    } else {
+        // failure...
+        timer_start = timer_freq = UINT64_MAX;
+    }
+}
diff --git a/code/printf.h b/code/printf.h
index f097aa3..0f71805 100644
--- a/code/printf.h
+++ b/code/printf.h
@@ -71,6 +71,14 @@ inline static int FMT_FUNC_NAME (void *ctx, OutputFunc out, const FMT_CHAR_TYPE
             } else {
                 int_length = SHORT;
             }
+        } else if (*fmt == 'z') {
+            fmt++;
+
+            int_length = _Generic((size_t)0,
+                                  unsigned short:     SHORT,
+                                  unsigned int:       INT,
+                                  unsigned long:      LONG,
+                                  unsigned long long: LLONG);
         }
 
         FMT_CHAR_TYPE ch = *fmt++;
diff --git a/inc/time.h b/inc/time.h
index 0fa12e7..2e49983 100644
--- a/inc/time.h
+++ b/inc/time.h
@@ -1,14 +1,18 @@
-
 #pragma once
+#include <stddef.h>
 
 #if !defined(NULL)
-    #define NULL ((void *)0)
+#define NULL ((void *)0)
 #endif
 
 // The number of clock ticks per second
 #define CLOCKS_PER_SEC  ((clock_t)1000)
+
 #define TIME_UTC 1
 
+typedef size_t clock_t;
+typedef size_t time_t;
+
 struct timespec {
 	time_t tv_sec;  // Seconds - >= 0
 	long   tv_nsec; // Nanoseconds - [0, 999999999]
@@ -30,7 +34,7 @@ clock_t clock(void);
 double difftime(time_t time1, time_t time0);
 time_t mktime(struct tm *timeptr);
 time_t time(time_t *timer);
-int timespec_get(timespec *ts, int base);
+int timespec_get(struct timespec *ts, int base);
 char *asctime(const struct tm *timeptr);
 char *ctime(const time_t *timer);
 struct tm *gmtime(const time_t *timer);
@@ -38,8 +42,8 @@ struct tm *localtime(const time_t *timer);
 size_t strftime(char * restrict s, size_t maxsize, const char * restrict format, const struct tm * restrict timeptr);
 
 #ifdef __STDC_WANT_LIB_EXT1__
-	errno_t asctime_s(char *s, rsize_t maxsize, const struct tm *timeptr);
-	errno_t ctime_s(char *s, rsize_t maxsize, const time_t *timer);
-	struct tm *gmtime_s(const time_t * restrict timer, struct tm * restrict result);
-	struct tm *localtime_s(const time_t * restrict timer, struct tm * restrict result);
+errno_t asctime_s(char *s, rsize_t maxsize, const struct tm *timeptr);
+errno_t ctime_s(char *s, rsize_t maxsize, const time_t *timer);
+struct tm *gmtime_s(const time_t * restrict timer, struct tm * restrict result);
+struct tm *localtime_s(const time_t * restrict timer, struct tm * restrict result);
 #endif
diff --git a/test/test4.c b/test/test4.c
index 32187e9..29c4f09 100644
--- a/test/test4.c
+++ b/test/test4.c
@@ -1,6 +1,7 @@
 // https://en.cppreference.com/w/c/algorithm/bsearch
 #include <stdlib.h>
 #include <stdio.h>
+#include <time.h>
 
 struct data {
     int nr;
@@ -17,9 +18,6 @@ int data_cmp(void const *lhs, void const *rhs)
     if (l->nr < r->nr) return -1;
     else if (l->nr > r->nr) return 1;
     else return 0;
-
-    // return (l->nr > r->nr) - (l->nr < r->nr); // possible shortcut
-    // return l->nr - r->nr; // erroneous shortcut (fails if INT_MIN is present)
 }
 
 int main(void)
@@ -31,4 +29,17 @@ int main(void)
     } else {
         printf("No %d not found\n", key.nr);
     }
+
+    while (clock() <= 3*CLOCKS_PER_SEC) {
+        printf("%llu seconds\n", clock() / CLOCKS_PER_SEC);
+    }
+
+    struct timespec start;
+    timespec_get(&start, TIME_UTC);
+
+    struct timespec ts;
+    do {
+        timespec_get(&ts, TIME_UTC);
+        printf("%zu:%ld\n", ts.tv_sec, ts.tv_nsec);
+    } while (ts.tv_sec < start.tv_sec+5);
 }