When interest to be paid for entire month

Notwithstanding any agreement between the parties or any law for the time being in force, when a statement is delivered or pass book is supplied to a debtor under section 21 or if accounts are taken under section 33, or a tender is made by a debtor to a money-lender in respect of a loan under section 34 before the sixteenth day of a calendar month, the interest due shall be calculated as payable for fifteen days of the said month, and if the statement is delivered or pass book is supplied or accounts are taken or tender is made on any subsequent day, then for the entire calendar month irrespective of the fact that such statement is delivered or pass book is supplied or such accounts are taken or such tender is made on any such day.