The following steps use an example where the parameter field name is {?date parameter field}:
  1. Create a new Formula field (BB38893) and label it Start Date
 
  • Enter the code: Minimum ({?date parameter field})
 
  • Click Save and Close
 
  • Insert this formula field in the Report Header
 
  • Create a new Formula field and label it End Date
 
  • Enter the code: Maximum ({?date parameter field})
 
  • Click Save and Close
 
  • Insert this formula field in the Report Header