title: Blank Date Parameter Rather than using 'Allow Null' Checkbox
body: <p>I will try to be as clear as possible with what I need here. Basically, I have 'FromDate' and 'ToDate' parameters. By default, I want these parameters to include ALL date/times. I can achieve this by checking the 'Allow Nulls', and handling the NULL in the main stored procedure. Unfortunately, business users will not understand what the Null checkbox means. Also, I can set the default dates to be the earliest and latest dates SQL Server supports, but this is ugly. Thus, I need a work around.
  I need some way to have these parameters default to a blank value such that when I run the report, I immediately get records back regardless of the date. Then, if the user wants to adjust the date, they should be able to click the Calendar icon and choose From and To Dates (The parameter MUST stay Datetime).
  Any ideas?</p>