diff --git a/cfg/std.cfg b/cfg/std.cfg
index 9c4f344e6..4e0d973c1 100644
--- a/cfg/std.cfg
+++ b/cfg/std.cfg
@@ -2018,6 +2018,18 @@ The obsolete function 'gets' is called. With 'gets' you'll get a buffer overrun
       <not-uninit/>
     </arg>
   </function>
+  <!-- struct tm *localtime_s(const time_t *restrict time, struct tm *restrict result) -->
+  <function name="localtime_s,std::localtime_s">
+    <noreturn>false</noreturn>
+    <leak-ignore/>
+    <arg nr="1">
+      <not-null/>
+      <not-uninit/>
+    </arg>
+    <arg nr="2">
+      <not-null/>
+    </arg>
+  </function>
   <!-- double log(double x); -->
   <!-- float logf(float x); -->
   <!-- long double logl(long double x);-->
diff --git a/cfg/windows.cfg b/cfg/windows.cfg
index e235ecefa..0bf3b4fe5 100644
--- a/cfg/windows.cfg
+++ b/cfg/windows.cfg
@@ -3541,4 +3541,17 @@ HFONT CreateFont(
       <not-uninit/>
     </arg>
   </function>
+  <!-- errno_t _localtime32_s( struct tm* _tm, const time32_t *time);
+       errno_t _localtime64_s( struct tm* _tm, const _time64_t *time); -->
+  <function name="_localtime32_s,_localtime64_s">
+    <noreturn>false</noreturn>
+    <leak-ignore/>
+    <arg nr="1">
+      <not-null/>
+      <not-uninit/>
+    </arg>
+    <arg nr="2">
+      <not-null/>
+    </arg>
+  </function>
 </def>