Align with go library layout

tai64.go

@@ -0,0 +1,28 @@
+package main
+
+import (
+	"bytes"
+	"encoding/binary"
+	"time"
+)
+
+const (
+	TAI64NBase = uint64(4611686018427387914)
+	TAI64NSize = 12
+)
+
+type TAI64N [TAI64NSize]byte
+
+func Timestamp() TAI64N {
+	var tai64n TAI64N
+	now := time.Now()
+	secs := TAI64NBase + uint64(now.Unix())
+	nano := uint32(now.UnixNano())
+	binary.BigEndian.PutUint64(tai64n[:], secs)
+	binary.BigEndian.PutUint32(tai64n[8:], nano)
+	return tai64n
+}
+
+func (t1 *TAI64N) After(t2 TAI64N) bool {
+	return bytes.Compare(t1[:], t2[:]) > 0
+}