diff --git a/dlls/msvcr100/msvcr100.spec b/dlls/msvcr100/msvcr100.spec
index 6e860e8833e..a305cb26060 100644
--- a/dlls/msvcr100/msvcr100.spec
+++ b/dlls/msvcr100/msvcr100.spec
@@ -560,9 +560,9 @@
 @ varargs _cscanf_s(str) msvcrt._cscanf_s
 @ varargs _cscanf_s_l(str ptr) msvcrt._cscanf_s_l
 @ cdecl _ctime32(ptr) msvcrt._ctime32
-@ stub _ctime32_s
+@ cdecl _ctime32_s(str long ptr) msvcrt._ctime32_s
 @ cdecl _ctime64(ptr) msvcrt._ctime64
-@ stub _ctime64_s
+@ cdecl _ctime64_s(str long ptr) msvcrt._ctime64_s
 @ cdecl _cwait(ptr long long) msvcrt._cwait
 @ varargs _cwprintf(wstr) msvcrt._cwprintf
 @ stub _cwprintf_l
diff --git a/dlls/msvcr80/msvcr80.spec b/dlls/msvcr80/msvcr80.spec
index 17785be4388..36f522cc8fc 100644
--- a/dlls/msvcr80/msvcr80.spec
+++ b/dlls/msvcr80/msvcr80.spec
@@ -399,9 +399,9 @@
 @ varargs _cscanf_s(str) msvcrt._cscanf_s
 @ varargs _cscanf_s_l(str ptr) msvcrt._cscanf_s_l
 @ cdecl _ctime32(ptr) msvcrt._ctime32
-@ stub _ctime32_s
+@ cdecl _ctime32_s(str ptr long) msvcrt._ctime32_s
 @ cdecl _ctime64(ptr) msvcrt._ctime64
-@ stub _ctime64_s
+@ cdecl _ctime64_s(str ptr long) msvcrt._ctime64_s
 @ cdecl _cwait(ptr long long) msvcrt._cwait
 @ varargs _cwprintf(wstr) msvcrt._cwprintf
 @ stub _cwprintf_l
diff --git a/dlls/msvcr90/msvcr90.spec b/dlls/msvcr90/msvcr90.spec
index 663e1b704bf..33bfb33bc50 100644
--- a/dlls/msvcr90/msvcr90.spec
+++ b/dlls/msvcr90/msvcr90.spec
@@ -391,9 +391,9 @@
 @ varargs _cscanf_s(str) msvcrt._cscanf_s
 @ varargs _cscanf_s_l(str ptr) msvcrt._cscanf_s_l
 @ cdecl _ctime32(ptr) msvcrt._ctime32
-@ stub _ctime32_s
+@ cdecl _ctime32_s(str long ptr) msvcrt._ctime32_s
 @ cdecl _ctime64(ptr) msvcrt._ctime64
-@ stub _ctime64_s
+@ cdecl _ctime64_s(str long ptr) msvcrt._ctime64_s
 @ cdecl _cwait(ptr long long) msvcrt._cwait
 @ varargs _cwprintf(wstr) msvcrt._cwprintf
 @ stub _cwprintf_l
diff --git a/dlls/msvcrt/msvcrt.spec b/dlls/msvcrt/msvcrt.spec
index 3db6fa4c113..e65c152a3d2 100644
--- a/dlls/msvcrt/msvcrt.spec
+++ b/dlls/msvcrt/msvcrt.spec
@@ -356,9 +356,9 @@
 @ varargs _cscanf_s(str)
 @ varargs _cscanf_s_l(str ptr)
 @ cdecl _ctime32(ptr) MSVCRT__ctime32
-# stub _ctime32_s
+@ cdecl _ctime32_s(str long ptr) MSVCRT__ctime32_s
 @ cdecl _ctime64(ptr) MSVCRT__ctime64
-# stub _ctime64_s
+@ cdecl _ctime64_s(str long ptr) MSVCRT__ctime64_s
 @ extern _ctype MSVCRT__ctype
 @ cdecl _cwait(ptr long long)
 @ varargs _cwprintf(wstr)
diff --git a/dlls/msvcrt/time.c b/dlls/msvcrt/time.c
index b345a7f8e16..7ccdc7dca16 100644
--- a/dlls/msvcrt/time.c
+++ b/dlls/msvcrt/time.c
@@ -901,6 +901,28 @@ char * CDECL MSVCRT__ctime64(const MSVCRT___time64_t *time)
     return MSVCRT_asctime( t );
 }
 
+/*********************************************************************
+ *		_ctime64_s (MSVCRT.@)
+ */
+int CDECL MSVCRT__ctime64_s(char *res, MSVCRT_size_t len, const MSVCRT___time64_t *time)
+{
+    struct MSVCRT_tm *t;
+    if( !MSVCRT_CHECK_PMT( res != NULL ) || !MSVCRT_CHECK_PMT( len >= 26 ) )
+    {
+        *MSVCRT__errno() = MSVCRT_EINVAL;
+        return MSVCRT_EINVAL;
+    }
+    res[0] = '\0';
+    if( !MSVCRT_CHECK_PMT( time != NULL ) || !MSVCRT_CHECK_PMT( time > 0 ) )
+    {
+        *MSVCRT__errno() = MSVCRT_EINVAL;
+        return MSVCRT_EINVAL;
+    }
+    t = MSVCRT__localtime64( time );
+    strcpy( res, MSVCRT_asctime( t ) );
+    return 0;
+}
+
 /*********************************************************************
  *		_ctime32 (MSVCRT.@)
  */
@@ -912,6 +934,28 @@ char * CDECL MSVCRT__ctime32(const MSVCRT___time32_t *time)
     return MSVCRT_asctime( t );
 }
 
+/*********************************************************************
+ *		_ctime32_s (MSVCRT.@)
+ */
+int CDECL MSVCRT__ctime32_s(char *res, MSVCRT_size_t len, const MSVCRT___time32_t *time)
+{
+    struct MSVCRT_tm *t;
+    if( !MSVCRT_CHECK_PMT( res != NULL ) || !MSVCRT_CHECK_PMT( len >= 26 ) )
+    {
+        *MSVCRT__errno() = MSVCRT_EINVAL;
+        return MSVCRT_EINVAL;
+    }
+    res[0] = '\0';
+    if( !MSVCRT_CHECK_PMT( time != NULL ) || !MSVCRT_CHECK_PMT( time > 0 ) )
+    {
+        *MSVCRT__errno() = MSVCRT_EINVAL;
+        return MSVCRT_EINVAL;
+    }
+    t = MSVCRT__localtime32( time );
+    strcpy( res, MSVCRT_asctime( t ) );
+    return 0;
+}
+
 /*********************************************************************
  *		ctime (MSVCRT.@)
  */