From 1a5adfc547c3fb25d4a6339b8047483bcc76c587 Mon Sep 17 00:00:00 2001
From: xinsheng Ren <285808407@qq.com>
Date: Sat, 28 Jan 2023 17:29:38 +0800
Subject: [PATCH] fix:getTimeOfDay on windows (#19680)

---
 source/os/src/osTime.c | 47 ++++++++++++++----------------------------
 1 file changed, 15 insertions(+), 32 deletions(-)

diff --git a/source/os/src/osTime.c b/source/os/src/osTime.c
index cd4324a592..685693a709 100644
--- a/source/os/src/osTime.c
+++ b/source/os/src/osTime.c
@@ -33,6 +33,11 @@
 #include <time.h>
 //#define TM_YEAR_BASE 1970 //origin
 #define TM_YEAR_BASE 1900  // slguan
+
+// This magic number is the number of 100 nanosecond intervals since January 1, 1601 (UTC)
+// until 00:00:00 January 1, 1970
+static const uint64_t TIMEEPOCH = ((uint64_t)116444736000000000ULL);
+
 /*
  * We do not implement alternate representations. However, we always
  * check whether a given modifier is allowed for a certain conversion.
@@ -341,15 +346,17 @@ char *taosStrpTime(const char *buf, const char *fmt, struct tm *tm) {
 
 int32_t taosGetTimeOfDay(struct timeval *tv) {
 #ifdef WINDOWS
-  time_t t;
-  t = taosGetTimestampSec();
-  SYSTEMTIME st;
-  GetLocalTime(&st);
+  LARGE_INTEGER t;
+  FILETIME      f;
 
-  tv->tv_sec = (long)t;
-  tv->tv_usec = st.wMilliseconds * 1000;
+  GetSystemTimeAsFileTime(&f);
+  t.QuadPart = f.dwHighDateTime;
+  t.QuadPart <<= 32;
+  t.QuadPart |= f.dwLowDateTime;
 
-  return 0;
+  t.QuadPart -= TIMEEPOCH;
+  tv->tv_sec = t.QuadPart / 10000000;
+  tv->tv_usec = (t.QuadPart % 10000000) / 10;
 #else
   return gettimeofday(tv, NULL);
 #endif
@@ -550,37 +557,13 @@ int32_t taosClockGetTime(int clock_id, struct timespec *pTS) {
 #ifdef WINDOWS
   LARGE_INTEGER        t;
   FILETIME             f;
-  static FILETIME      ff;
-  static SYSTEMTIME    ss;
-  static LARGE_INTEGER offset;
-
-  static int8_t        offsetInit = 0;
-  static volatile bool offsetInitFinished = false;
-  int8_t               old = atomic_val_compare_exchange_8(&offsetInit, 0, 1);
-  if (0 == old) {
-    ss.wYear = 1970;
-    ss.wMonth = 1;
-    ss.wDay = 1;
-    ss.wHour = 0;
-    ss.wMinute = 0;
-    ss.wSecond = 0;
-    ss.wMilliseconds = 0;
-    SystemTimeToFileTime(&ss, &ff);
-    offset.QuadPart = ff.dwHighDateTime;
-    offset.QuadPart <<= 32;
-    offset.QuadPart |= ff.dwLowDateTime;
-    offsetInitFinished = true;
-  } else {
-    while (!offsetInitFinished)
-      ;  // Ensure initialization is completed.
-  }
 
   GetSystemTimeAsFileTime(&f);
   t.QuadPart = f.dwHighDateTime;
   t.QuadPart <<= 32;
   t.QuadPart |= f.dwLowDateTime;
 
-  t.QuadPart -= offset.QuadPart;
+  t.QuadPart -= TIMEEPOCH;
   pTS->tv_sec = t.QuadPart / 10000000;
   pTS->tv_nsec = (t.QuadPart % 10000000) * 100;
   return (0);
-- 
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