help on how to change dates and language

?>
<style type="text/css">
.calculator_table
{
font-size:11px;
font-family:verdana, arial, sans-serif;
border:2pt solid #4444FF;
padding:25px;
width:300px;
}
</style>
<?php if(!empty($_POST['calculator_ok'])):
//last cycle date
$date="$_POST[dateyear]-$_POST[datemonth]-$_POST[dateday]";

//convert to time
$lasttime=mktime(0,0,0,$_POST['datemonth'],$_POST['dateday'],$_POST['dateyear']);

// next period start
$next_period=$lasttime + $_POST['days']*24*3600;
$next_period=date("F d, Y",$next_period);

//first fertile day
$firstdaytime=$lasttime + $_POST['days']*24*3600 - 16*24*3600;
$firstday=date("F d, Y",$firstdaytime);

//last fertile day
$lastdaytime=$lasttime + $_POST['days']*24*3600 - 12*24*3600;
$lastday=date("F d, Y",$lastdaytime);

//have to adjust due date?
$diff=$_POST['days'] - 28;

//due date $date + 280 days
$duedatetime=$lasttime + 280*24*3600 + $diff*24*3600;
$duedate=date("F d, Y",$duedatetime);

?>
<div class="calculator_table">
<p>Here are the results based on the information you provided:</p>
<p>Your next <b>menstrual period</b> is expected to start on <strong><?php echo

$next_period?></strong>.</p>
<p>You next <b>most fertile</b> period is <strong><?php echo $firstday?> to <?php echo

$lastday?></strong>.</p>
<p>If you conceive within this timeframe, your estimated <b>due date</b> will be

<strong><?php echo $duedate?></strong>.</p>
<p align="center"><input type="button" value="Calculate again!"

onclick="window.location='http://<?php echo $_SERVER['HTTP_HOST'];?><?php echo $_SERVER

['REQUEST_URI']?>'"></p>
</div>
<?php else:
//the calculator comes here
?>
<div class="calculator_table">
<form method="post">
<p>Please select the first day of your last menstrual period:</p>
<p><?php echo date_chooser("date",date("Y-m-d"))?></p>
<p>Usual number of days in your period: <select name="days">
<?php
for($i=20;$i<=45;$i++)
{
if($i==28) $selected='selected="true"';
else $selected='';
echo "<option $selected value='$i'>$i</option>";
}
?>
</select></p>
<p align="center"><input type="submit" name="calculator_ok" value="Calculate"></p>
</form>
</div>
<?php endif;

//to print a date chooser - get name and value in mysql date format
function date_chooser($name,$value="")
{
$months=array('','January','February','March','April','May','June','July','August',
'September','October','November','December');

if(empty($value)) $value=date("Y-m-d");

$parts=explode("-",$value);

$day=$parts[2]+0;
$month=$parts[1]+0;
$year=$parts[0];

$chooser="";

$chooser.="<select name='".$name."month'>";
for($i=1;$i<=12;$i++)
{
if($i==$month) $selected='selected="true"';
else $selected='';
$chooser.="<option $selected value='$i'>$months[$i]</option>";
}
$chooser.="</select> / ";

$chooser.="<select name='".$name."day'>";
for($i=1;$i<=31;$i++)
{
if($i==$day) $selected='selected';
else $selected='';
$chooser.="<option $selected value='$i'>$i</option>";
}
$chooser.="</select> / ";

$chooser.="<select name='".$name."year'>";
for($i=(date("Y")-1);$i<=2050;$i++)
{
if($i==$year) $selected='selected';
else $selected='';
$chooser.="<option $selected>$i</option>";
}
$chooser.="</select> ";

return $chooser;
}
?>

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