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
}