You can easily create a record field by selecting a source and looking to the Fields column to see the populated fields from that source.

Click and drag a field listed under the Fields column (left side) to the Record column (right side).

When you drag the first date field, you are prompted to create a time filter. As a result, a WHERE clause is added to the query generated for the record to limit the order records returned based on this date field. This approach supports incremental data loading.