How to write JavaScript in Ant tool

Below are the some examples lets you understand to write Java Script in ANT Tool.

Ex: To Calculate how much time its taken to run the target .

Step1: Calculate Start Time before executing target

Get the System Date and convert into Simple Date Format

<script language="javascript">
<![CDATA[

           importClass(java.text.SimpleDateFormat);
         

           fmt = new SimpleDateFormat("MM/dd/YYYY HH:mm:ss a");

           self.getProject().setProperty('startdateformat', fmt.format(new Date().getTime()));

       ]]>

</script>
<echo> time is ${startdateformat}</echo>
<echo> time is ${startTime}</echo>


Step 2.  Invoke Target. Ex:
<parallel threadcount="3">
<echo message="UseCase1" />
<echo message="UseCase2" />
<echo message="UseCase3" />
</parallel>

Step 3. Now Calculate End Time and Elapsed Time.
<script language="javascript">

<![CDATA[

importClass(java.text.SimpleDateFormat);
   fmt = new SimpleDateFormat("MM/dd/YYYY HH:mm:ss a");
self.getProject().setProperty('enddateformat', fmt.format(new Date().getTime()));
 project.setProperty('elapsedTime', new Date().getTime() - startTime)  ]]> </script>  
<echo>End Date format : ${enddateformat} ms</echo>
<echo>End time: ${endTime} ms</echo>


Here Elapsed Time Calcuated in Milli Seconds. Inorder to convert milliseconds to Seconds use below snippit in Ant.

<math result="result" operand1="${elapsedTime}" operation="/" operand2="1000" datatype="double"/>
<echo>result is ${result}</echo>