Updating member's birthday: month value does not show up right

Hi,
I am working with the date value for members to fill in their birthday.
I was able to find the code in the forum, but the month shows up as the current month 12 times in the pull down.
Like this:
November
November
November
November
November
November
November
November
November
November
November
November

Month:
<select name="month">
<?php foreach(range(1,12) as $month): ?>
<option value="<?php echo $month;?> <?php selectedIf($month,@$_REQUEST['month']);?>"><?php echo date("F",strtotime("0000-$month"));?></option>
<?php endforeach ?>
</select>

It works fine and I can update the records if I write like this :
Month:
<select name="month">
<?php foreach(range(1,12) as $month): ?>
<option value="<?php echo $month;?> <?php selectedIf($month,@$_REQUEST['month']);?>"><?php echo $month;?></option>
<?php endforeach ?>
</select>

Of course this only shows the numbers of the month. It's not a big problem for now, but it would be better to show up as January, February... and I am wondering why this is happening.

Thanks

Hiroko