Default Date Prompts to Current Date and Current Date - 30 days

Step 1: Name the Date prompts as FromDate and ToDate.

Step 2: Drag an HTML Item into the report just below the Value Prompt and insert the below script into the same:

<script type="text/javascript">
function DefaultDateSelection()
{
var fW = (typeof getFormWarpRequest == "function" ?getFormWarpRequest() : document.forms["formWarpRequest"]);
if ( !fW || fW == undefined)
{ fW = ( formWarpRequest_THIS_ ?formWarpRequest_THIS_ : formWarpRequest_NS_ );
}

var months = new Array('Jan','Feb','Mar','Apr','May','Jun','Jul','Aug','Sep','Oct','Nov','Dec');

var ToTime=new Date();
var ToMonth=months[ToTime.getMonth()];
var ToDate= ToTime.getDate();
var ToYear=ToTime.getYear();
var ToDate = ToMonth + ' ' + ToDate + ', ' + ToYear;

var FromTime = ToTime;
FromTime.setDate(FromTime.getDate()-30);
var FromMonth=months[FromTime.getMonth()];
var FromDate= FromTime.getDate();
var FromYear=FromTime.getYear();
var FromDate = FromMonth + ' ' + FromDate + ', ' + FromYear;

pickerControlFromDate.setValue(FromDate);
pickerControlToDate.setValue(ToDate);
}
DefaultDateSelection();
</script>

Note: This technique uses JavaScript against underlying report objects in a IBM Cognos 8 BI report. For this reason, there is no guarantee that reports created using this technique will migrate or upgrade successfully to future versions without requiring modifications. Any such modifications are the responsibility of the report designer.