Add Before/After/Equal to UnixNano

time/unix_nano.go

@@ -35,3 +35,18 @@ func (u UnixNano) ToTime() time.Time {
 func ToUnixNano(t time.Time) UnixNano {
 	return UnixNano(t.UnixNano())
 }
+
+// Before reports whether the time instant u is before t.
+func (u UnixNano) Before(t UnixNano) bool {
+	return u < t
+}
+
+// After reports whether the time instant u is after t.
+func (u UnixNano) After(t UnixNano) bool {
+	return u > t
+}
+
+// Equal reports whether the time instant u is equal to t.
+func (u UnixNano) Equal(t UnixNano) bool {
+	return u == t
+}

time/unix_nano_test.go

@@ -24,6 +24,7 @@ import (
 	"testing"
 	"time"
 
+	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 )
 
@@ -33,3 +34,30 @@ func TestUnixNano(t *testing.T) {
 	require.Equal(t, UnixNano(1000), unixNano)
 	require.Equal(t, time, unixNano.ToTime())
 }
+
+func TestUnixNanoBefore(t *testing.T) {
+	t0 := UnixNano(0)
+	t1 := UnixNano(1)
+
+	assert.Equal(t, true, t0.Before(t1))
+	assert.Equal(t, false, t1.Before(t0))
+	assert.Equal(t, false, t0.Before(t0))
+}
+
+func TestUnixNanoAfter(t *testing.T) {
+	t0 := UnixNano(0)
+	t1 := UnixNano(1)
+
+	assert.Equal(t, false, t0.After(t1))
+	assert.Equal(t, true, t1.After(t0))
+	assert.Equal(t, false, t0.After(t0))
+}
+
+func TestUnixNanoEqual(t *testing.T) {
+	t0 := UnixNano(0)
+	t1 := UnixNano(1)
+
+	assert.Equal(t, false, t0.Equal(t1))
+	assert.Equal(t, false, t1.Equal(t0))
+	assert.Equal(t, true, t0.Equal(t0))
+}