Date Time Cell Value
class DateTimeCellValue(val year: Int, val month: Int, val day: Int, val hour: Int, val minute: Int, val second: Int = 0, val millisecond: Int = 0, val microsecond: Int = 0) : CellValue(source)
Excel does not know if this is UTC or not. Use asDateTimeLocal or asDateTimeUtc to get the LocalDateTime you prefer.