Changing month names in calendar

How do I change the month names on the main calendar page? In the template there's only the varibles, not the names.

[Admin]

Edit calendar.php:

PHP Code:

$month1name = "January";
$month2name = "February";
$month3name = "March";
$month4name = "April";
$month5name = "May";
$month6name = "June";
$month7name = "July";
$month8name = "August";
$month9name = "September";
$month10name = "October";
$month11name = "November";
$month12name = "December"; 

[Eniyi]

Once more, for your help, thanks.

[Admin]

Always glad to help.