Debt payable at future time
52.  A creditor may prove for a debt not payable at the date of commencement of bankruptcy as if it were payable presently, and may receive any dividend equally with the other creditors, deducting from the dividend only a rebate of interest at the rate of interest prescribed in regulation 51 from the date of declaration of the dividend to the date when the debt would have become payable according to the terms on which it was contracted.