You can change the campaign to trigger the day before somebody’s birthday instead of making changes to the schedule. To make the changes for an existing campaign please follow the instructions:
- look for the Anniversary campaign and select the appropriate campaign
- Click Edit to make changes to the existing Birthday Campaign
- On second page "whom" look for Days before field: 
- Change the value as per the requirement to number of days before the reference date you may want to reward.
- Save the changes.
NOTE: Making any changes to the existing configuration may impact the users with Birthday on the same day. It will require you to manually gift the rewards to the specific users or you can design a campaign to gift specific users.
You may perform a data export to find specific users with Birthdays on same day and create a campaign to gift the individuals.
For a new campaign you can simply add the mentioned value while creating a campaign.
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