@type t() :: %BexioApiClient.Accounting.CalendarYear{
  annual_reporting?: boolean(),
  created_at: DateTime.t(),
  end: Date.t(),
  id: integer(),
  start: Date.t(),
  updated_at: DateTime.t(),
  vat_accounting_method: :effective | :net_tax | nil,
  vat_accounting_type: :agreed | :collected | nil,
  vat_subject?: boolean()
}

Bexio Calendar Year

Fields:

• :id - automatic id given by bexio
• :start - Start date of the calendar year
• :end - End date of the calendar year
• :vat_subject? - Determines if the calendar year is vat subjected or not
• :annual_reporting? - Determines if the calendar year is used for annual reporting
• :created_at - Creation date of the calendar year
• :updated_at - Last time when calendar year was updated
• :vat_accounting_method - VAT accounting method (effective or net_tax), null if not subjected to vat
• :vat_accounting_type - VAT accounting type (agreed or collected), null if not subjected to vat