Change short description before 30mins of custod date time field

[marrikruthi]

Change the short description of a problem ticket 30 minutes before a time set in a custom date/time field, i have  created a custom date field and created every posible way to check the requirement by using below method.
Event - After Business Rule- Script Action
can you provide a solution for this 

[Ankur Bawiskar]

@marrikruthi 

script action should work as you can mention when should the event be processed

please share your script action and also how are you triggering the event i.e. BR?

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