How can I report template from 30 days to 6 months?
Templates use views, and you can modify the timesettings of a view. But a bit more info is needed here, what kind of report are you trying to create? What should it contain as in objects (virtual machines, hosts, cluster..)
For example,
I want to have report for Host CPU 6mon.
Lets take the capacity report as an example here;
Look up the report and edit it:
Search for the view name as show in the right pane and edit the view
In the edit view go to Time settings and adjust as required.