getValidityPeriod format YYMMDDhhmmssUTCR

[parsibox]

hi
we need another format for validity period
update this with this code:

func convertValidityIrancell(d time.Duration) string {
	minutes := int(d / time.Minute)

	hours := minutes / 60
	minutes %= 60

	days := hours / 24
	hours %= 24
	//YYMMDDhhmmssUTCR
	formatted := fmt.Sprintf("%02d%02d%02d%02d%02d%02d000R",
		0, 0, days,
		hours, minutes, 0)

	return formatted
}