Android / Kotlin - format to UTC using this formatter from date data. "yyyy-MM-dd'T'HH:mm:ss'Z'"
fun SimpleDateFormat.format(year: Int, month: Int, day: Int, hour: Int, minute: Int): String {
timeZone = TimeZone.getTimeZone("UTC")
val calendar = GregorianCalendar.getInstance()
calendar.clear()
calendar.set(year, month, day, hour, minute)
return format(calendar.time)
}