Section [2]  in the previous image, is where the fun starts. Here, you can see the table structure, column names, and data. But most importantly, you can see the data type of each column. 

Fields can be of one of the following types: General, Date, Timestamp, and Geo data. Qlik Sense automatically assigns a type based on the field data. A field type can be changed by clicking on the type symbol and selecting the correct field type.