(a)     a reference to a year of assessment shall in the case of any taxpayer who has under the provisions of section 66(13A) of this Act been permitted to furnish accounts in respect of the income derived by him from pastoral, agricultural or other farming operations made up to a date other than the last day of the relevant year of assessment, be construed as a reference to the period covered by such accounts; and

 

(b)     a reference to the end of a year of assessment includes, where the period assessed ends on a date other than the last day of the year of assessment, a reference to the end of that period.