You can sort date field in ascending/descending order or sort by a different measure/field or my month/year/day wise.
- Sort manually by clicking on sort icon for month order.
- Right click on the field and click on sort, sort dialog box opens.
- Select the field by which need to be sorted and the order for sort. Then click on ok.
Hope this helps you.
For an in-depth explanation check out Tableau Training Course details.