func DateFormat(format string, timestamp interface{}) (t string) { // timestamp
	switch format {
	case "Y-m-d H:i:s", "":
		format = "2006-01-02 15:04:05"
	case "Y-m-d H:i":
		format = "2006-01-02 15:04"
	case "y-m-d H:i":
		format = "06-01-02 15:04"
	case "m-d H:i":
		format = "01-02 15:04"
	case "Y-m-d":
		format = "2006-01-02"
	case "y-m-d":
		format = "06-01-02"
	case "m-d":
		format = "01-02"
	default:
		format = ConvDateFormat(format)
	}
	sd := Int64(timestamp)
	t = time.Unix(sd, 0).Format(format)
	return
}