diff --git a/include/mbedtls/platform.h b/include/mbedtls/platform.h
index 1371ff1..7922e8c 100644
--- a/include/mbedtls/platform.h
+++ b/include/mbedtls/platform.h
@@ -66,6 +66,9 @@
 #if !defined(MBEDTLS_PLATFORM_STD_EXIT)
 #define MBEDTLS_PLATFORM_STD_EXIT      exit /**< Default exit to use */
 #endif
+#if !defined(MBEDTLS_PLATFORM_STD_TIME)
+#define MBEDTLS_PLATFORM_STD_TIME       time    /**< Default time to use */
+#endif
 #if !defined(MBEDTLS_PLATFORM_STD_EXIT_SUCCESS)
 #define MBEDTLS_PLATFORM_STD_EXIT_SUCCESS  EXIT_SUCCESS /**< Default exit value to use */
 #endif
@@ -227,6 +230,37 @@
 #define MBEDTLS_EXIT_FAILURE 1
 #endif
 
+/*
+ * The time_t datatype
+ */
+#if defined(MBEDTLS_PLATFORM_TIME_T_MACRO)
+#define mbedtls_time_t MBEDTLS_PLATFORM_TIME_T_MACRO
+#else
+#define mbedtls_time_t time_t
+#endif /* MBEDTLS_PLATFORM_TIME_T_MACRO */
+
+/*
+ * The function pointers for time
+ */
+#if defined(MBEDTLS_PLATFORM_TIME_ALT)
+extern time_t (*mbedtls_time)( mbedtls_time_t* time );
+
+/**
+ * \brief   Set your own time function pointer
+ *
+ * \param   time_func   the time function implementation
+ *
+ * \return              0
+ */
+int mbedtls_platform_set_time( mbedtls_time_t (*time_func)( mbedtls_time_t time ) );
+#else
+#if defined(MBEDTLS_PLATFORM_TIME_MACRO)
+#define mbedtls_time    MBEDTLS_PLATFORM_TIME_MACRO
+#else
+#define mbedtls_time   time
+#endif /* MBEDTLS_PLATFORM_TIME_MACRO */
+#endif /* MBEDTLS_PLATFORM_TIME_ALT */
+
 #ifdef __cplusplus
 }
 #endif