diff --git "a/lib/nghttp2_time.c" "b/lib/nghttp2_time.c"
index 897556f..ab06684 100644
--- "a/lib/nghttp2_time.c"
+++ "b/lib/nghttp2_time.c"
@@ -32,31 +32,15 @@
 #  include <sysinfoapi.h>
 #endif /* HAVE_SYSINFOAPI_H */
 
-#if !defined(HAVE_GETTICKCOUNT64) || defined(__CYGWIN__)
-static uint64_t time_now_sec(void) {
-  time_t t = time(NULL);
+uint64_t nghttp2_time_now_sec(void)
+{
+  FILETIME file_time;
+  ULARGE_INTEGER time_value;
+  
+  GetSystemTimeAsFileTime(&file_time);
 
-  if (t == -1) {
-    return 0;
-  }
+  time_value.LowPart  = file_time.dwLowDateTime;
+  time_value.HighPart = file_time.dwHighDateTime;
 
-  return (uint64_t)t;
+  return time_value.QuadPart / 10000000ULL;
 }
-#endif /* !HAVE_GETTICKCOUNT64 || __CYGWIN__ */
-
-#if defined(HAVE_GETTICKCOUNT64) && !defined(__CYGWIN__)
-uint64_t nghttp2_time_now_sec(void) { return GetTickCount64() / 1000; }
-#elif defined(HAVE_CLOCK_GETTIME)
-uint64_t nghttp2_time_now_sec(void) {
-  struct timespec tp;
-  int rv = clock_gettime(CLOCK_MONOTONIC, &tp);
-
-  if (rv == -1) {
-    return time_now_sec();
-  }
-
-  return (uint64_t)tp.tv_sec;
-}
-#else  /* (!HAVE_CLOCK_GETTIME || __CYGWIN__) && !HAVE_GETTICKCOUNT64 */
-uint64_t nghttp2_time_now_sec(void) { return time_now_sec(); }
-#endif /* (!HAVE_CLOCK_GETTIME || __CYGWIN__) && !HAVE_GETTICKCOUNT64 */