go.mod    |  1 +
 go.sum    |  2 ++
 run.go    |  8 ++++----
 tai64n.go | 30 +++---------------------------

diff --git a/go.mod b/go.mod
index 38e317a9cd1019f8aca1e55f8725129757b05ec9547a211ad14a530f5c1b999a..a077e0bad2b77b93b9e5dbc204cb57d921498ba01849fd6bd3114da1bb25fe30 100644
--- a/go.mod
+++ b/go.mod
@@ -4,6 +4,7 @@ go 1.14
 
 require (
 	go.cypherpunks.ru/recfile v0.3.0
+	go.cypherpunks.ru/tai64n v0.1.0
 	golang.org/x/crypto v0.0.0-20201117144127-c1f2f97bffc9
 	golang.org/x/sys v0.0.0-20201117222635-ba5294a509c7
 	golang.org/x/term v0.0.0-20201117132131-f5c789dd3221
diff --git a/go.sum b/go.sum
index 4b3078d5dbeba18eb6ab518a53669cf0e28d89f1238e51164af9a14016aaa120..20116d4d10aefad46805aafab5bd2e07fd11f3d3f9ca232e47473111b52716c4 100644
--- a/go.sum
+++ b/go.sum
@@ -1,5 +1,7 @@
 go.cypherpunks.ru/recfile v0.3.0 h1:aZRMMst8hoNOIhGjCA/VxjTN5VBSEN4W4zyhWF/7xSU=
 go.cypherpunks.ru/recfile v0.3.0/go.mod h1:p1ZUMeyQQbQg+ICtKH3+Zt59QLI0tCZYZj/75Vp1buk=
+go.cypherpunks.ru/tai64n v0.1.0 h1:XT1ys6lbo4/bjDQpMA8Xu5TCx6Y6aAYYYn5G0quE8sk=
+go.cypherpunks.ru/tai64n v0.1.0/go.mod h1:mjuUq/ZQAOEKvzAAl25RIrN6JExWA4fRkOs7o7OVvYE=
 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
 golang.org/x/crypto v0.0.0-20201117144127-c1f2f97bffc9 h1:phUcVbl53swtrUN8kQEXFhUxPlIlWyBfKmidCu7P95o=
 golang.org/x/crypto v0.0.0-20201117144127-c1f2f97bffc9/go.mod h1:jdWPYTVW3xRLrWPugEBEK3UY2ZEsg3UU495nc5E+M+I=
diff --git a/run.go b/run.go
index 065aadc8f5cb3c0e906eb13d797dc9c6a7729098d4e1e62146a69019447021f5..6b6740ad0f55fe1a0eca7946fff3b5a4c90227a456ea03fea03fdda067e5d5e9 100644
--- a/run.go
+++ b/run.go
@@ -21,7 +21,6 @@ package main
 
 import (
 	"bufio"
-	"encoding/hex"
 	"errors"
 	"flag"
 	"fmt"
@@ -35,6 +34,7 @@ 	"syscall"
 	"time"
 
 	"go.cypherpunks.ru/recfile"
+	"go.cypherpunks.ru/tai64n"
 	"golang.org/x/sys/unix"
 )
 
@@ -409,7 +409,7 @@ 		stderrTerm := make(chan struct{}, 0)
 		go func() {
 			scanner := bufio.NewScanner(stderr)
 			var line string
-			ts := new(TAI64N)
+			ts := new(tai64n.TAI64N)
 			for scanner.Scan() {
 				line = scanner.Text()
 				if strings.HasPrefix(line, childStderrPrefix) {
@@ -418,9 +418,9 @@ 					os.Stderr.WriteString(StderrPrefix + line + "\n")
 					continue
 				}
 				if fdStderr != nil {
-					tai64nNow(ts)
+					tai64n.FromTime(time.Now(), ts)
 					LogMutex.Lock()
-					fmt.Fprintf(fdStderr, "@%s %s\n", hex.EncodeToString(ts[:]), line)
+					fmt.Fprintf(fdStderr, "%s %s\n", ts.Encode(), line)
 					LogMutex.Unlock()
 				}
 				if StderrSilent {
diff --git a/tai64n.go b/tai64n.go
index 3153d9180161facd9be3e15ebf95854c9b2fa766e05c69dca2ba1113ee726e80..c689763dbfd0dca19fd36254dee1234817dc3f0f03b13e81278b2c58cd5646f7 100644
--- a/tai64n.go
+++ b/tai64n.go
@@ -19,36 +19,18 @@ package main
 
 import (
 	"bufio"
-	"encoding/binary"
-	"encoding/hex"
-	"errors"
 	"io"
 	"strings"
 	"time"
-)
 
-const (
-	TAI64NSize     = 12
-	TAI64NBase     = 0x400000000000000a
-	TAI64NLocalFmt = "2006-01-02 15:04:05.000000000"
+	"go.cypherpunks.ru/tai64n"
 )
 
-type TAI64N [TAI64NSize]byte
-
-func tai64nNow(ts *TAI64N) {
-	t := time.Now()
-	binary.BigEndian.PutUint64(ts[:], uint64(TAI64NBase)+uint64(t.Unix()))
-	binary.BigEndian.PutUint32(ts[8:], uint32(t.Nanosecond()))
-}
-
 func tai64nLocal(dst io.StringWriter, src io.Reader) error {
 	scanner := bufio.NewScanner(src)
 	var err error
 	var s string
 	var sep int
-	var ts []byte
-	var secs int64
-	var nano int64
 	var t time.Time
 	for {
 		if !scanner.Scan() {
@@ -66,17 +48,11 @@ 		sep = strings.IndexByte(s, byte(' '))
 		if sep == -1 {
 			dst.WriteString(s + "\n")
 		}
-		ts, err = hex.DecodeString(s[1:sep])
+		t, err = tai64n.Decode(s[1:sep])
 		if err != nil {
 			return err
 		}
-		if len(ts) != TAI64NSize {
-			return errors.New("invalid ts length")
-		}
-		secs = int64(binary.BigEndian.Uint64(ts[:8]))
-		nano = int64(binary.BigEndian.Uint32(ts[8:]))
-		t = time.Unix(secs-TAI64NBase, nano)
-		dst.WriteString(t.Format(TAI64NLocalFmt) + s[sep:] + "\n")
+		dst.WriteString(t.Format(tai64n.LocalFmt) + s[sep:] + "\n")
 	}
 	return nil
 }