diff --git a/contrib/win32/win32compat/w32log.c b/contrib/win32/win32compat/w32log.c
index 32ca8a510..7eeb7734f 100644
--- a/contrib/win32/win32compat/w32log.c
+++ b/contrib/win32/win32compat/w32log.c
@@ -98,8 +98,8 @@ syslog(int priority, const char *format, const char *formatBuffer)
 		return;
 
 	GetLocalTime(&st);
-	r = _snprintf_s(msgbufTimestamp, sizeof(msgbufTimestamp), _TRUNCATE, "%d %02d/%02d/%04d %02d:%02d:%02d:%03d %s\n",
-		GetCurrentProcessId(), st.wMonth, st.wDay, st.wYear, st.wHour, st.wMinute, st.wSecond,
+	r = _snprintf_s(msgbufTimestamp, sizeof(msgbufTimestamp), _TRUNCATE, "%d %04d-%02d-%02d %02d:%02d:%02d.%03d %s\n",
+		GetCurrentProcessId(), st.wYear, st.wMonth, st.wDay, st.wHour, st.wMinute, st.wSecond,
 		st.wMilliseconds, formatBuffer);
 	if (r == -1) {
 		_write(logfd, "_snprintf_s failed.", 30);
@@ -107,4 +107,4 @@ syslog(int priority, const char *format, const char *formatBuffer)
 	}
 	msgbufTimestamp[strnlen(msgbufTimestamp, MSGBUFSIZ)] = '\0';
 	_write(logfd, msgbufTimestamp, (unsigned int)strnlen(msgbufTimestamp, MSGBUFSIZ));
-}
\ No newline at end of file
+}