func NewPubDate(d time.Time) *PubDate {
	return &PubDate{d}
}
NewPubDate returns a new PubDate.
package podcasts
import (
	"bytes"
	"encoding/xml"
	"io"
	"strconv"
	"strings"
	"time"
)
const (
	rssXmlns   = "http://www.itunes.com/dtds/podcast-1.0.dtd"
	rssVersion = "2.0"
	rfc2822    = "Mon, 02 Jan 2006 15:04:05 -0700"
)