Using BusinessHours.add for calculating a due date in a Datetime field

I found an Apex trigger that adds 9 business hours, and I’m looking to use it to add 16 business hours to the CreatedDate field on a case and put that new value into a custom Datetime field called Qualification_Due_Date__c, and I’m having issues making it do what I want it to do. Any help would be greatly appreciated.

Here’s the code as it currently sits…

trigger CalculateQualificationDueDate on Case (before insert, before update) {
    BusinessHours bh = [select Id from BusinessHours where IsDefault=true];
    Case.Qualification_Due_Date__c = BusinessHours.add(bh.Id, Datetime.Now (), 32400000);
}

Answers:

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Method 1

Try this code out and see if it works for you.

trigger CalculateQualificationDueDate on Case (before insert, before update) {
    BusinessHours bh = [SELECT Id FROM BusinessHours WHERE IsDefault=true];
    for( Case c : Trigger.new )
    {
        c.Qualification_Due_Date__c = BusinessHours.add(bh.Id, Datetime.Now (), 32400000);  
    }    
}

Method 2

try below code : updated from 32400000(9*3600000) to 57600000(12*3600000)

 trigger CalculateQualificationDueDate on Case (before insert, before update) {
    BusinessHours bh = [select Id from BusinessHours where IsDefault=true];
    Case.Qualification_Due_Date__c = BusinessHours.add(bh.Id, Datetime.Now (), 57600000);
}

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