time.go
func (t Time) Ptr() *time.Time {
	if !t.Valid {
		return nil
	}
	return &t.Time
}
func (t Time) Ptr() *time.Time {
	if !t.Valid {
		return nil
	}
	return &t.Time
}
// Ptr returns a pointer to this Time's value, or a nil pointer if this Time is null.