Convert a Field to a Date Field Each database stores Date fields in slightly different ways. Tableau does its best in interpreting the date fields, but sometimes a field will be imported to Tableau as a text string or numerical field. If this happens, there are a few steps we can take to resolve the issue. Verifying Date Fields The date field might appear as a string when connecting to the Data Source... Or as a string in the Dimensions Pane. When dates are interpreted as strings, you will lose all of the features and conveniences of working with date fields, such as drilling down, using date calculations, and switching between Continuous and Discrete measures. If your dates aren't interpreted correctly, take the following steps in order: Change the data type of the field Create a calculation using the DATEPARSE function Create a calculation using the DATE function Change the data type of the field The first step in resolving a date field inter...