Hello,
If in the sale deed it is mentioned that the cheque have been issued on 24.10.2018 then I would not advise you to fill any date which is otherwise, he may dispute this thing in 138 proceedings.
Send him a legal notice and tell him that the cheque dated 24.10.2018 which will get expire on 24.04.2018 have to be encashed as per your promise and as such you are directed to maintain the balance as you will be presenting the cheques.
Note that after getting the cheque bounced you can not keep to for long and then file a case as per your whims and fancies. As and when the cheque is bounced, legal notice in terms of section 138 has to be served within 30 days and thereafter the case has to be filed within the prescribed time.
Regards