It is possible to use Jet Analytics as the back-end layer with Targit being used as the front-end for end users. Targit has specific requirements with regards to how the Date dimension must be configured, in order for Targit to utilize the dates properly.
In order for the Date dimension in the Jet Data Manager to be usable by Targit, there must be a time definition associated with the Date dimension and it must be in a format used by Targit.
Targit has compiled a document on how to make the appropriate updates and this document is attached to this KB article below.
If this solution does not resolve the issue please contact your Targit reseller.