For setting the time-tokens in dashboard based on Time Picker input, there are two approaches:
1) Using <eval> to set tokens
2) Use addinfo command in an independent search to set the required token using <done> or <progress> search event handler.
Since you need the second approach, please refer to following sample search which displays the required output (you would need to remove the search outside of <row><panel><table> as independent search and set the required tokens using Search Event Handler as per your need.
Following is the Simple XML code for above run anywhere example: