Needing help, finishing a program

Hey,

I'm needing somehelp in ActionScript 3. I'm a beginner so just looking for help. I'm attemping to make a program that converts Standard Time to Traditional Time,.I have already set up my variables but don't know how to finish the program. So basically If the user is asked to enter a time like "14:22:10" the lblOutput.text should display "2:22 PM". I will include the code below. Thanks in advance. I have inluded where the code should be written, I just don't know how to convert it.

// This line makes the button, btnConvert wait for a mouse click
// When the button is clicked, the convertTime function is called
btnConvert.addEventListener(MouseEvent.CLICK, convertTime);

// This line makes the textinput wait for a mouse click
// When this component is clicked, the clearLabels function is called
txtinStandard.addEventListener(MouseEvent.CLICK, clearLabels);

// Declare Global Variables
var traditionalTime:String;    // traditional time

// This is the convertTime function
// e:MouseEvent is the click event experienced by the button
// void indicates that the function does not return a value
function convertTime(e:MouseEvent):void
{
// declare the variables
var standardTime:String;    // standard time entered by user
 
standardTime = txtinStandard.text;     // get standard time from user
convertToTraditional(standardTime);    // call the convertToTraditional function

// output an appropriate message in the label
lblOutput.text = standardTime + " is equivalent to " + traditionalTime;
}

// This is function convertToTraditional
// s – is the standard time
// It determines the traditional time based on the value of s
function convertToTraditional(s:String)
{
// write the code here

{
// This is the clearLabels function
// e:MouseEvent is the click event experienced by the textInput
// void indicates that the function does not return a value
function clearLabels(e:MouseEvent):void
{
     lblOutput.text = "";
  txtinStandard.text = "";
}