diff --git a/cfg/std.cfg b/cfg/std.cfg
index 11b20948e..cb1bf28cc 100644
--- a/cfg/std.cfg
+++ b/cfg/std.cfg
@@ -3178,6 +3178,7 @@ The obsolete function 'gets' is called. With 'gets' you'll get a buffer overrun
     <leak-ignore/>
     <arg nr="1" direction="in">
       <not-null/>
+      <not-uninit/>
     </arg>
     <arg nr="2" direction="out">
       <not-null/>
diff --git a/test/cfg/std.c b/test/cfg/std.c
index f3e600b03..97fef1fbb 100644
--- a/test/cfg/std.c
+++ b/test/cfg/std.c
@@ -19,12 +19,33 @@
 #include <wctype.h>
 #include <fenv.h>
 #include <setjmp.h>
+#define __STDC_WANT_LIB_EXT1__ 1
 #include <time.h>
 #include <stdbool.h>
 #include <stdint.h>
 #include <inttypes.h>
 #include <float.h>
 
+// As with all bounds-checked functions, localtime_s is only guaranteed to be available if __STDC_LIB_EXT1__ is defined by the implementation and if the user defines __STDC_WANT_LIB_EXT1__ to the integer constant 1 before including time.h.
+#ifdef __STDC_LIB_EXT1__
+void uninitvar_localtime_s(const time_t *restrict time, struct tm *restrict result)
+{
+    const time_t *restrict Time;
+    // cppcheck-suppress uninitvar
+    (void)localtime_s(Time, result);
+    (void)localtime_s(time, result);
+}
+
+void nullPointer_localtime_s(const time_t *restrict time, struct tm *restrict result)
+{
+    // cppcheck-suppress nullPointer
+    (void)localtime_s(NULL, result);
+    // cppcheck-suppress nullPointer
+    (void)localtime_s(time, NULL);
+    (void)localtime_s(time, result);
+}
+#endif // __STDC_LIB_EXT1__
+
 size_t bufferAccessOutOfBounds_wcsrtombs(char * dest, const wchar_t ** src, size_t len, mbstate_t * ps)
 {
     char buf[42];
diff --git a/test/cfg/std.cpp b/test/cfg/std.cpp
index 6be4cd6db..d6e3bf460 100644
--- a/test/cfg/std.cpp
+++ b/test/cfg/std.cpp
@@ -21,6 +21,7 @@
 #include <cstdio>
 #include <cstdlib>
 #include <cstring>
+#define __STDC_WANT_LIB_EXT1__ 1
 #include <ctime>
 #include <cwchar>
 #include <fstream>
@@ -31,6 +32,26 @@
 #include <iterator>
 #include <vector>
 
+// As with all bounds-checked functions, localtime_s is only guaranteed to be available if __STDC_LIB_EXT1__ is defined by the implementation and if the user defines __STDC_WANT_LIB_EXT1__ to the integer constant 1 before including time.h.
+#ifdef __STDC_LIB_EXT1__
+void uninitvar_localtime_s(const std::time_t *restrict time, struct tm *restrict result)
+{
+    const std::time_t *restrict Time;
+    // TODO cppcheck-suppress uninitvar
+    (void)std::localtime_s(Time, result);
+    (void)std::localtime_s(time, result);
+}
+
+void nullPointer_localtime_s(const std::time_t *restrict time, struct tm *restrict result)
+{
+    // cppcheck-suppress nullPointer
+    (void)std::localtime_s(NULL, result);
+    // cppcheck-suppress nullPointer
+    (void)std::localtime_s(time, NULL);
+    (void)std::localtime_s(time, result);
+}
+#endif // __STDC_LIB_EXT1__
+
 size_t nullPointer_strftime(char *s, size_t max, const char *fmt, const struct tm *p)
 {
     // cppcheck-suppress nullPointer