This version requires the 5.2 version of the Date API!
After updating the files on your system, you'll find the Calendar modules in a new Date/Time section of the admin/build/modules page. Be sure to visit update.php to update your database. Make sure to set up your site timezone name after installing the new Date API.
As with the new Date API, the new version will work with either PHP 4 or PHP 5, but will be noticably more efficient with PHP 5.2. In very limited tested, calendar page execution times using the new code under PHP 5.2 were up to 20-30% faster with than the older code.
* All the calculations use the new, improved date and timezone handling added by Date API version 2 (see http://drupal.org/project/date for details).
* The queries have been updated to do the timezone conversion in the database and return items that have already been converted to the local timezone. It's more efficient to do this in the database and it easier to drop the right dates into the right places in the calendar.
* If the new Date Popup module is enabled, a jQuery popup date selector is available at the top of the page to allow you to easily jump to any year, month, and day.