tai64n.go | 3 ---

diff --git a/tai64n.go b/tai64n.go
index 7bc18077ac546f5ae751affe44ecced5d657e4328696377faf4db5d2eeae3200..83e20f830ec27157ce7cde7d3759a14f874c0b5a43da122b42e2c337cdc5288c 100644
--- a/tai64n.go
+++ b/tai64n.go
@@ -67,9 +67,6 @@ 		secs = int64(binary.BigEndian.Uint64(tai[:8])) - Base
 	default:
 		panic("invalid tai size")
 	}
-	if secs < 0 {
-		panic("dates < 1970-01-01 are not supported")
-	}
 	return time.Unix(secs, nano)
 }