Check the displayed Server Time. First, make sure that the Time Zone (+nnnn or -nnnn) is the correct one. Then, check the displayed Server Time.
If any of these parameters are incorrect, fix your Server OS settings. You may have to restart the OS and/or the CommuniGate Pro Server to active the new OS time settings.
If the Server Time is specified correctly, select the Time Zone most of your users will use. If you select the "built-in" zone (HostOS), the Server will use a fictitious zone that has the same time difference with GMT as the Server OS has at this time. This zone has no support for daylight saving time and it cannot be used for sending recurrent events outside your Server. Unless your Time Zone is not listed, avoid selecting the "built-in" zone.