Here is the latest Malaysia Stamp Issue Programme Schedule dated 07 May 2019. Do remember to update your calendar. Information is always confirmed nearer the date of issue.
Relax and just open a SODA account. Most collectors are non-concordanist, thus there is very little planning required other than to know when to show up if you prefer to do your own, OR open a Standing Order Deposit Account (SODA) which is an easier way not to miss a single issue.