It's an old post, but essentially he's asking about how to do supress an action which is outlined in this document: https://docs.appdynamics.com/display/PRO45/Action+Suppression#ActionSuppression-ConfigureActionSuppression
Once you're there, then follow his cron expression link above on what the syntax is.
You can also set this up when building your health rule as outlined in this document: https://docs.appdynamics.com/display/PRO45/Create+a+Health+Rule#CreateaHealthRule-Create_Manage_HRSchedules
Which kind of has reverse logic. Usually you want the action to "start" when you want it to actually end supression, and then "end" when you want it to actually it to start, that way that "Health Rule" will only run everytime except the times you speecifically outlined to supress.
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