1 files changed, 3 insertions, 0 deletions
diff --git a/internal.h b/internal.h
index 3fa07b41a0..598b231a3d 100644
--- a/internal.h
+++ b/internal.h
@@ -19,6 +19,9 @@ extern "C" {
 #endif
 #endif
 
+#define TIMET_MAX (~(time_t)0 <= 0 ? (time_t)((~(unsigned_time_t)0) >> 1) : (time_t)(~(unsigned_time_t)0))
+#define TIMET_MIN (~(time_t)0 <= 0 ? (time_t)(((unsigned_time_t)1) << (sizeof(time_t) * CHAR_BIT - 1)) : (time_t)0)
+
 struct rb_deprecated_classext_struct {
     char conflict[sizeof(VALUE) * 3];
 };