Default date prompt behavior in a report

Requirement: For a month to day report, always default the Start Date prompt to the first of the month

Step 1: Create a Time & Date prompt on the prompt page

Step 2: Give the prompt a specific name (ex: StartDate in this example)

Step 3: Drag an HTML item to the right of the prompt as shown below

Step 4: Paste the following script into the HTML Item
<script type = "text/javascript">

// Function returns the first day of the month for the current month
function MonthFirstDay ()
{

// Create a new variable to store today's date
var vCurrDate = new Date();

// Truncate the date to first of the month of this year
var vFirstDay = new Date(vCurrDate.getFullYear(), vCurrDate.getMonth(), 1);

// Convert the date in vFirstDay variable to a string value
var vStrDay = [vFirstDay.getUTCFullYear(), vFirstDay.getMonth()+1, vFirstDay.getDate()].join("-");

// Return the date
return vStrDay ;
}

// Function returns the time entered in the variable Time
function SetTime ()
{
var vTime = "09:00:00.000" ;
return vTime;
}

pickerControlStartDate.setValue( MonthFirstDay() );
timePickerStartDate.setValue( SetTime() );

</script>

Step 5: Replace StartDate (Bolded above) to the name of your prompt
Step 6: Run the report, and the result should be similar to