Revert "Don't use modules"

This reverts commit bffe99aeadae09abd02f2bd3184925af6b680535.

1 files changed, 26 insertions, 0 deletions

diff --git a/internal/tai64n/tai64n.go b/internal/tai64n/tai64n.go
new file mode 100644
index 0000000..da5257c
--- /dev/null
+++ b/internal/tai64n/tai64n.go
@@ -0,0 +1,26 @@
+package tai64n
+
+import (
+	"bytes"
+	"encoding/binary"
+	"time"
+)
+
+const TimestampSize = 12
+const base = uint64(4611686018427387914)
+
+type Timestamp [TimestampSize]byte
+
+func Now() Timestamp {
+	var tai64n Timestamp
+	now := time.Now()
+	secs := base + uint64(now.Unix())
+	nano := uint32(now.UnixNano())
+	binary.BigEndian.PutUint64(tai64n[:], secs)
+	binary.BigEndian.PutUint32(tai64n[8:], nano)
+	return tai64n
+}
+
+func (t1 Timestamp) After(t2 Timestamp) bool {
+	return bytes.Compare(t1[:], t2[:]) > 0
+}