date.go
func (d *Date) DeepCopy() *Date {
	if d == nil {
		return nil
	}
	out := new(Date)
	d.DeepCopyInto(out)
	return out
}
func (d *Date) DeepCopy() *Date {
	if d == nil {
		return nil
	}
	out := new(Date)
	d.DeepCopyInto(out)
	return out
}
// DeepCopy copies the receiver into a new Date.