Voucher 1 year (PS1.6.1.20)

[Zeryk]

Vouchers converted from Loyalty Points are valid 1 year , I believe that is set in classes/ Discount.php file in

        $voucher->date_to = date('Y-m-d H:i:s', $now + (3600 * 24 * 365.25)); /* 1 year */

I want to change it to 3 months and what ever I write in brackets , it doesn't change a thing :-( still keep doing 1 year.

Based on previous topic I've found here , I couldn't get things working either  since it applies much older versions and modules/loyalty/ LoyaltyModule.php  doesn't include any numbers related to the Y-m-H ..or so.

Anybody can help with this? Which file and how to change it?

Thanks.