Adjust the Time Bar Range
You can adjust the time bar range using the time bar range dialog, the From and To sliders, and maximum range selector. You can also zoom into a selected time range.
Except for derived fields, the default range for a time bar field is the maximum range of its values.
The default range for a derived time field is always the current year. Use the range dialog on the time bar to adjust the range for the derived field to represent the actual data available. For example, if your derived field data is for 2017-2018, the default range will be the current year, which might fall after the actual dates in the data. Using the range dialog on the time bar, you can adjust the range to 2017-2018.
See the following topics: