مساعدة في عمل برنامج تغيير الوقت بالجافا

<html>

<head>

<title>U.S. time zones</title>

</head>

<body>

<h1>U.S. time zones</h1>

<form name= "timeZones">

When it is <input type=text name=hoursBox 'size=2'>

:00

<select name=ampmList>

<option value="am">am

<option value="pm">pm

</select>

in the pacific time zone,it is

<br>

<input type=text name=shiftedTimeBox 'size=8' >

in the

<select name=zoneList>

<option value="Hawaii">Hawaii

<option value="Alaska">Alaska

<option value="Pacific">Pacific

<option value="Mountain">Mountain

<option value="Central">Central

<option value="Eastern">Eastern

</select>

<input type=button value="Update"

onclick='

var hours =

parseInt(document.timeZones.hoursBox.value);

if (hours < 1 || hours > 12) {

alert("Please enter an integer from 1 to 12.");

return;

}

// using alert to display input as reality check

var ampm = document.timeZones.ampmList.value;

alert("Input " + hours + ":00 " + ampm

+ " is valid.");

var time = document.timeZones.shiftedTimeBox.value =

"not sure yet";

var zone = document.timeZones.zoneList.value;

alert("Input " + hours + ":00 " + zone

+ " is valid.");'

>

</form>

</body>