A post-dated cheque is a standard negotiable cheque that is written by the tenant for a date in the future. Post-dated cheques are commonly written out to the landlord or the property management for the upcoming months of rent. The cheque amount will only be withdrawn on the future date that you have written.
For example, that your rental period starts on June 3rd, 2018 and you have already paid the first and last months’ rent. You would date the cheques for the upcoming unpaid months of June, July, August, etc... until April 2019 since May 2019 (your last month) has already been paid. Your first post-dated cheque should be dated July 3rd, 2018, which is your second month of rent.