src/util/Date.php
public static function months($format = null) {
        $months = array();

        if ($format === static::MONTHS_LONG || $format === static::MONTHS_SHORT) {
            for ($i = 1; $i <= 12; ++$i) {
                $months[$i] = strftime($format, mktime(0, 0, 0, $i, 1));
            }
        } else {
            $months = static::hours();
        }

        return $months;
    }
public static function months($format = null) {
        $months = array();

        if ($format === static::MONTHS_LONG || $format === static::MONTHS_SHORT) {
            for ($i = 1; $i <= 12; ++$i) {
                $months[$i] = strftime($format, mktime(0, 0, 0, $i, 1));
            }
        } else {
            $months = static::hours();
        }

        return $months;
    }
Number of months in a year. Typically used as a shortcut for generating
a list that can be used in a form.

By default a mirrored array of $month_number => $month_number is returned

Date::months();
// aray(1 => 1, 2 => 2, 3 => 3, ..., 12 => 12)

But you can customise this by passing in either Date::MONTHS_LONG

Date::months(Date::MONTHS_LONG);
// array(1 => 'January', 2 => 'February', ..., 12 => 'December')

Or Date::MONTHS_SHORT

Date::months(Date::MONTHS_SHORT);
// array(1 => 'Jan', 2 => 'Feb', ..., 12 => 'Dec')

@uses    Date::hours
@param   string $format The format to use for months
@return  array   An array of months based on the specified format