Using ad extension scheduling you can now optimize what time of the day your ad extensions are delivered and ensure that you get more value from your ads. More details on the feature are available in our recent announcement. This feature is available in both the Campaign and Bulk APIs. The changes in each service are listed below.
The Ad Schedule, Start Date, End Date, and Use Searcher Time Zone columns are added to each of the Ad Extension Bulk record types.
Campaign Management API
The Schedule and DayTime objects are added to the Campaign Management service for ad extension scheduling. The Scheduling element is added to the AdExtension base class and inherited by all ad extensions.
More details on the API changes can be found here.