Often people validate their datasets by comparing the results of the connector to the statistics they can see in Facebook's Insights UI. When they are doing so, the dates are generally off by 1 day. For example, if the Facebook UI shows 1000 views for a page on March 3, the connector will report 1000 views with a date timestamp of March 4. This is because the API returns data for a time period that ends at the timestamp specified. In this example, there were 1000 views during the day that ended at Midnight on March 4, in other words, March 3. The Insights UI takes this into account and reports the 1000 views as having happened on March 3.