time.go
func (t *Time) UnmarshalJSON(data []byte) error {
	var err error
	var v interface{}
	if err = json.Unmarshal(data, &v); err != nil {
		return err
	}
	switch x := v.(type) {
	case string:
		err = t.Time.UnmarshalJSON(data)
	case map[string]interface{}:
		ti, tiOK := x["Time"].(string)
		valid, validOK := x["Valid"].(bool)
		if !tiOK || !validOK {
			return fmt.Errorf(`json: unmarshalling object into Go value of type null.Time requires key "Time" to be of type string and key "Valid" to be of type bool; found %T and %T, respectively`, x["Time"], x["Valid"])
		}
		err = t.Time.UnmarshalText([]byte(ti))
		t.Valid = valid
		return err
	case nil:
		t.Valid = false
		return nil
	default:
		err = fmt.Errorf("json: cannot unmarshal %v into Go value of type null.Time", reflect.TypeOf(v).Name())
	}
	t.Valid = err == nil
	return err
}
func (t *Time) UnmarshalJSON(data []byte) error {
	var err error
	var v interface{}
	if err = json.Unmarshal(data, &v); err != nil {
		return err
	}
	switch x := v.(type) {
	case string:
		err = t.Time.UnmarshalJSON(data)
	case map[string]interface{}:
		ti, tiOK := x["Time"].(string)
		valid, validOK := x["Valid"].(bool)
		if !tiOK || !validOK {
			return fmt.Errorf(`json: unmarshalling object into Go value of type null.Time requires key "Time" to be of type string and key "Valid" to be of type bool; found %T and %T, respectively`, x["Time"], x["Valid"])
		}
		err = t.Time.UnmarshalText([]byte(ti))
		t.Valid = valid
		return err
	case nil:
		t.Valid = false
		return nil
	default:
		err = fmt.Errorf("json: cannot unmarshal %v into Go value of type null.Time", reflect.TypeOf(v).Name())
	}
	t.Valid = err == nil
	return err
}
// UnmarshalJSON implements json.Unmarshaler.
// It supports string, object (e.g. pq.NullTime and friends)
// and null input.