In the header panel in a dashboard, you can set up a Date Selector that will filter your maps, indicators and graphs based on the range selected. The title of the option should be a text option in indicator and graph titles.
For example, say you have a dashboard detailing work orders. You have a date range selector in place and two date range options could be "Last 30 days" and "Last 60 days"
Then you have an indicator showing the number of work orders completed. The title of the indicator would ideally be "Work Orders Completed During Last 30 Days". If you change the date selection, the title would change to whatever you titled the date selection period. So if you changed the date selection to the last 60 days option, the title of the indicator would also update to "Work Orders Completed During Last 60 Days"