diff --git a/include/inttypes.h b/include/inttypes.h
index 6111de0f8fa..b0dedee7f5e 100644
--- a/include/inttypes.h
+++ b/include/inttypes.h
@@ -338,6 +338,36 @@
 #define SCNxOFF     SCNx32
 #endif
 
+/* time_t */
+
+#ifdef CONFIG_SYSTEM_TIME64
+#define PRIdTM      PRId64
+#define PRIiTM      PRIi64
+#define PRIoTM      PRIo64
+#define PRIuTM      PRIu64
+#define PRIxTM      PRIx64
+#define PRIXTM      PRIX64
+
+#define SCNdTM      SCNd64
+#define SCNiTM      SCNi64
+#define SCNoTM      SCNo64
+#define SCNuTM      SCNu64
+#define SCNxTM      SCNx64
+#else
+#define PRIdTM      PRId32
+#define PRIiTM      PRIi32
+#define PRIoTM      PRIo32
+#define PRIuTM      PRIu32
+#define PRIxTM      PRIx32
+#define PRIXTM      PRIX32
+
+#define SCNdTM      SCNd32
+#define SCNiTM      SCNi32
+#define SCNoTM      SCNo32
+#define SCNuTM      SCNu32
+#define SCNxTM      SCNx32
+#endif
+
 /****************************************************************************
  * Type Definitions
  ****************************************************************************/