JCal Pro® will function quite well with no changes to the configuration. However, accurate calendaring requires all users to adjust their timezone offsets.
1. In the administrative backend of your Joomla web site, select Components > JCal Pro® > Settings from the main menu. Select the Environment tab, choose the appropriate timezone offset and then Save your settings.
2. In the administrative backend of your Joomla web site, select Site > Global Configuration from the main menu. On the Server tab, locate the timezone settings, adjust the timezone offset to match that specified in the JCal Pro® settings as described above and Save your changes.