On 24/11/2017 21:32, ma3434tt@openmailbox.org wrote:
Hi,

Can it be possible to schedule third last day of every month?

Thanks,

Matt
Try
   C-h f diary-list-sexp-entries

What you are looking for could be something close to:
   %%(diary-date t 27 t) notice on the 27th of every month
   %%(diary-float t 1 -1) notice on the last Monday of every month

Put that in your ~/diary file.

For Org Mode integration you need to customize the org-agenda-include-diary variable.