IMPORTANT NOTE: After starting the recipe, changing the since parameter has NO effect. You cannot pick up older events by setting to an older date. Also, if the recipe was stopped for a while, when it is restarted, it will pick all events from the last job that ran.
To control the events you want to pick up, you will need to make a copy of the recipe and set the Since parameter to the desired date and start the recipe. If you set Since to an older date, it might cause duplicate records to be created. Click here to see how you can prevent duplicate records from being created.